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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
(Mark One)
    Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the quarterly period ended June 30, 2024 or
    Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Commission File Number 0-53713 
OTTER TAIL CORPORATION
(Exact name of registrant as specified in its charter) 
Minnesota
(State or other jurisdiction of incorporation or organization)
27-0383995
(I.R.S. Employer Identification No.)
215 South Cascade Street, Box 496, Fergus Falls, Minnesota
(Address of principal executive offices)
56538-0496
(Zip Code)
Registrant's telephone number, including area code: 866-410-8780
Securities registered pursuant to Section 12(b) of the Act: 
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Shares, par value $5.00 per shareOTTRThe Nasdaq Stock Market LLC
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes      No   
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes       No   
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): 
 
Large Accelerated Filer
Accelerated Filer
 
Non-Accelerated Filer
Smaller Reporting Company
Emerging Growth Company
 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act   
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes    No  
Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date:
41,827,967 Common Shares ($5 par value) as of July 31, 2024. 



TABLE OF CONTENTS

1

DEFINITIONS
The following abbreviations or acronyms are used in the text.
ADP
Advanced Determination of Prudence
MISOMidcontinent Independent System Operator, Inc.
AMEAvailable Maximum EmergencyNDDEQNorth Dakota Department of Environmental Quality
ARO
Asset Retirement Obligation
NDPSCNorth Dakota Public Service Commission
ARPAlternative Revenue ProgramOTCOtter Tail Corporation
BTDBTD Manufacturing, Inc.OTPOtter Tail Power Company
CCR
Coal Combustion Residual
PIRPhase-In Rider
CO2
Carbon Dioxide
PSLRAPrivate Securities Litigation Reform Act of 1995
ECOEnergy Conservation and Optimization RiderPTCProduction Tax Credits
EPAEnvironmental Protection AgencyPVCPolyvinyl chloride
ESSRPExecutive Survivor and Supplemental Retirement PlanRHRRegional Haze Rule
EUICElectric Utility Infrastructure Costs RiderROEReturn on equity
FERCFederal Energy Regulatory CommissionRRRRenewable Resource Rider
GHGGreenhouse Gas
RTO
Regional Transmission Organizations
IRPIntegrated Resource PlanSECSecurities and Exchange Commission
kwhkilowatt-hourT.O. PlasticsT.O. Plastics, Inc.
MDTMeter and Distribution TechnologyTCRTransmission Cost Recovery Rider
MerricourtMerricourt Wind Energy Center
FORWARD-LOOKING INFORMATION
This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 (the "PSLRA"). When used in this Form 10-Q and in future filings by Otter Tail Corporation (the "Company") with the Securities and Exchange Commission ("SEC"), in the Company’s press releases and in oral statements, words such as “anticipate,” “believe,” “can," "could,” “estimate,” “expect,” "future," "goal," “intend,” "likely," “may,” “outlook,” “plan,” “possible,” “potential,” "predict," "probable," "projected," “should,” "target," “will,” “would” or similar expressions are intended to identify forward-looking statements within the meaning of the PSLRA. Such statements are based on current expectations and assumptions and entail various risks and uncertainties that could cause actual results to differ materially from those expressed in such forward-looking statements. The Company’s risks and uncertainties include, among other things, uncertainty of future investments and capital expenditures, rate base levels and rate base growth, long-term investment risk, seasonal weather patterns and extreme weather events, counterparty credit risk, future business volumes with key customers, reductions in our credit ratings, our ability to access capital markets on favorable terms, assumptions and costs relating to funding our employee benefit plans, our subsidiaries’ ability to make dividend payments, cyber security threats or data breaches, the impact of government legislation and regulation including foreign trade policy and environmental, health and safety laws and regulations, the impact of climate change including compliance with legislative and regulatory changes to address climate change, operational and economic risks associated with our electric generating and manufacturing facilities, risks associated with energy markets, the availability and pricing of resource materials, inflation cost pressures, attracting and maintaining a qualified and stable workforce, expectations regarding regulatory proceedings, including state utility commission approval of resource plans, assigned service areas, the siting and construction of major facilities, capital structure, and allowed customer rates, and changing macroeconomic and industry conditions that impact demand for our products, pricing and margins. These and other risks and uncertainties are more fully described in our filings with the SEC, including our most recently filed Annual Report on Form 10-K. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information.
PART I. FINANCIAL INFORMATION
ITEM 1.FINANCIAL STATEMENTS

2

OTTER TAIL CORPORATION
CONSOLIDATED BALANCE SHEETS (unaudited)
(in thousands, except share data)June 30, 2024December 31, 2023
Assets  
Current Assets  
Cash and Cash Equivalents$230,672 $230,373 
Receivables, net of allowance for credit losses191,946 157,143 
Inventories161,787 149,701 
Regulatory Assets8,172 16,127 
Other Current Assets21,551 16,826 
Total Current Assets614,128 570,170 
Noncurrent Assets
Investments117,062 62,516 
Property, Plant and Equipment, net of accumulated depreciation2,538,841 2,418,375 
Regulatory Assets95,605 95,715 
Intangible Assets, net of accumulated amortization6,293 6,843 
Goodwill37,572 37,572 
Other Noncurrent Assets51,282 51,377 
Total Noncurrent Assets2,846,655 2,672,398 
Total Assets$3,460,783 $3,242,568 
Liabilities and Shareholders' Equity
Current Liabilities
Short-Term Debt$12,809 $81,422 
Accounts Payable126,926 94,428 
Accrued Salaries and Wages25,972 38,134 
Accrued Taxes20,608 26,590 
Regulatory Liabilities45,183 25,408 
Other Current Liabilities39,454 43,775 
Total Current Liabilities270,952 309,757 
Noncurrent Liabilities
Pension Benefit Liability32,781 33,101 
Other Postretirement Benefits Liability27,759 27,676 
Regulatory Liabilities275,068 276,547 
Deferred Income Taxes249,489 237,273 
Deferred Tax Credits14,799 15,172 
Other Noncurrent Liabilities80,691 75,977 
Total Noncurrent Liabilities680,587 665,746 
Commitments and Contingencies (Note 10)
Capitalization
Long-Term Debt943,592 824,059 
Shareholders' Equity
Common Shares: 50,000,000 shares authorized, $5 par value; 41,814,425 and 41,710,521
outstanding at June 30, 2024 and December 31, 2023
209,072 208,553 
Additional Paid-In Capital427,264 426,963 
Retained Earnings928,553 806,342 
Accumulated Other Comprehensive Income763 1,148 
Total Shareholders' Equity1,565,652 1,443,006 
Total Capitalization2,509,244 2,267,065 
Total Liabilities and Shareholders' Equity$3,460,783 $3,242,568 
See accompanying condensed notes to consolidated financial statements.
3

OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF INCOME (unaudited)
Three Months Ended June 30,Six Months Ended June 30,
(in thousands, except per-share amounts)2024202320242023
Operating Revenues  
Electric$112,828 $113,763 $254,317 $265,671 
Product Sales229,508 223,953 435,087 411,126 
Total Operating Revenues342,336 337,716 689,404 676,797 
Operating Expenses
Electric Production Fuel12,324 14,833 30,018 26,326 
Electric Purchased Power9,249 5,212 31,771 47,037 
Electric Operating and Maintenance Expenses44,652 45,522 92,630 91,070 
Cost of Products Sold (excluding depreciation)116,795 120,658 231,518 233,027 
Nonelectric Selling, General, and Administrative Expenses
18,154 16,870 37,067 35,568 
Depreciation and Amortization26,632 24,232 52,528 48,089 
Electric Property Taxes3,619 4,336 7,986 8,957 
Total Operating Expenses231,425 231,663 483,518 490,074 
Operating Income110,911 106,053 205,886 186,723 
Other Income and (Expense)
Interest Expense(10,202)(9,696)(20,052)(19,111)
Nonservice Components of Postretirement Benefits2,388 2,421 4,830 4,833 
Other Income (Expense), net4,490 3,253 9,069 5,370 
Income Before Income Taxes107,587 102,031 199,733 177,815 
Income Tax Expense20,592 20,062 38,400 33,365 
Net Income$86,995 $81,969 $161,333 $144,450 
Weighted-Average Common Shares Outstanding:
Basic41,784 41,678 41,754 41,655 
Diluted42,068 42,053 42,051 42,035 
Earnings Per Share:
Basic$2.08 $1.97 $3.86 $3.47 
Diluted$2.07 $1.95 $3.84 $3.44 
See accompanying condensed notes to consolidated financial statements.
4

OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Net Income$86,995 $81,969 $161,333 $144,450 
Other Comprehensive Loss:
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax benefit (expense) of $71, $16, $74 and $(5)
(269)(61)(282)19 
Pension and Other Postretirement Benefits, net of tax benefit of $10, $9, $36 and $19
(29)(27)(103)(53)
Total Other Comprehensive Loss
(298)(88)(385)(34)
Total Comprehensive Income$86,697 $81,881 $160,948 $144,416 
See accompanying condensed notes to consolidated financial statements.
5

OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited)
(in thousands, except common shares outstanding)Common
Shares
Outstanding
Par Value,
Common
Shares
Additional Paid-In CapitalRetained
Earnings
Accumulated Other
Comprehensive
Income (Loss)
Total Shareholders' Equity
Balance, March 31, 202441,783,750 $208,918 $426,358 $861,127 $1,061 $1,497,464 
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes30,675 154 (154)— —  
Stock Issued Under Stock Purchase Plan, net of expenses— — (250)— — (250)
Net Income— — — 86,995 — 86,995 
Other Comprehensive Loss
— — — — (298)(298)
Stock Compensation Expense— — 1,310 — — 1,310 
Common Dividends ($0.4675 per share)
— — — (19,569)— (19,569)
Balance, June 30, 202441,814,425 $209,072 $427,264 $928,553 $763 $1,565,652 
Balance, March 31, 202341,684,526 $208,423 $424,948 $629,437 $969 $1,263,777 
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes25,995 130 (130)— —  
Stock Issued Under Stock Purchase Plan, net of expenses— — (167)— — (167)
Net Income— — — 81,969 — 81,969 
Other Comprehensive Loss
— — — — (88)(88)
Stock Compensation Expense— — 1,216 — — 1,216 
Common Dividends ($0.4375 per share)
— — — (18,268)— (18,268)
Balance, June 30, 202341,710,521 $208,553 $425,867 $693,138 $881 $1,328,439 
Balance, December 31, 202341,710,521 $208,553 $426,963 $806,342 $1,148 $1,443,006 
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes103,904 519 (6,272)— — (5,753)
Stock Issued Under Stock Purchase Plan, net of expenses— — (251)— — (251)
Net Income— — — 161,333 — 161,333 
Other Comprehensive Loss
— — — — (385)(385)
Stock Compensation Expense— — 6,824 — — 6,824 
Common Dividends ($0.9350 per share)
— — — (39,122)— (39,122)
Balance, June 30, 202441,814,425 $209,072 $427,264 $928,553 $763 $1,565,652 
Balance, December 31, 202241,631,113 $208,156 $423,034 $585,212 $915 $1,217,317 
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes79,408 397 (3,485)— — (3,088)
Stock Issued Under Stock Purchase Plan, net of expenses— — (166)— — (166)
Net Income— — — 144,450 — 144,450 
Other Comprehensive Loss— — — — (34)(34)
Stock Compensation Expense— — 6,484 — — 6,484 
Common Dividends ($0.8750 per share)
— — — (36,524)— (36,524)
Balance, June 30, 202341,710,521 $208,553 $425,867 $693,138 $881 $1,328,439 
See accompanying condensed notes to consolidated financial statements.
6

OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)
Six Months Ended June 30,
(in thousands)20242023
Operating Activities  
Net Income$161,333 $144,450 
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization52,528 48,089 
Deferred Tax Credits(372)(372)
Deferred Income Taxes9,492 8,708 
Investment Gains
(3,111)(4,295)
Stock Compensation Expense6,824 6,484 
Other, Net(1,251)161 
Changes in Operating Assets and Liabilities:
Receivables(34,803)(50,558)
Inventories(11,551)2,396 
Regulatory Assets7,361 7,320 
Other Assets(3,951)3,561 
Accounts Payable41,239 1,037 
Accrued and Other Liabilities(19,312)(4,271)
Regulatory Liabilities23,863 27,169 
Pension and Other Postretirement Benefits(4,828)(5,382)
Net Cash Provided by Operating Activities223,461 184,497 
Investing Activities
Capital Expenditures(175,528)(151,516)
Proceeds from Disposal of Noncurrent Assets5,124 2,970 
Cash Used for Investments and Other Assets(57,661)(5,079)
Net Cash Used in Investing Activities(228,065)(153,625)
Financing Activities
Net Borrowings (Repayments) of Short-Term Debt(68,612)41,993 
Proceeds from Issuance of Long-Term Debt120,000  
Dividends Paid(39,122)(36,524)
Payments for Shares Withheld for Employee Tax Obligations(5,753)(3,088)
Other, net(1,610)(1,671)
Net Cash Provided by Financing Activities
4,903 710 
Net Change in Cash and Cash Equivalents299 31,582 
Cash and Cash Equivalents at Beginning of Period230,373 118,996 
Cash and Cash Equivalents at End of Period$230,672 $150,578 
Supplemental Disclosure of Noncash Investing Activities
Accrued Property, Plant and Equipment Additions$9,198 $13,149 
See accompanying condensed notes to consolidated financial statements
7

OTTER TAIL CORPORATION
CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (unaudited)
1. Summary of Significant Accounting Policies
Overview
Otter Tail Corporation (OTC) and its subsidiaries (collectively, the "Company", "us", "our" or "we") form a diverse, multi-platform business consisting of a vertically integrated, regulated utility with generation, transmission and distribution facilities complemented by manufacturing businesses providing metal fabrication for custom machine parts and metal components, manufacturing of extruded and thermoformed plastic products, and manufacturing of polyvinyl chloride (PVC) pipe products. We classify our business into three segments: Electric, Manufacturing and Plastics.
Basis of Presentation
The unaudited consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the SEC for interim reporting. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles. In the opinion of management, we have included all adjustments, including normal recurring accruals, necessary for a fair presentation of the consolidated financial statements for the periods presented. The consolidated financial statements and condensed notes thereto should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023.
Because of the seasonality of our businesses and other factors, the earnings for the three and six months ended June 30, 2024 should not be taken as an indication of earnings for all or any part of the balance of the current year or as an indication of earnings for future years.
Use of Estimates
We use estimates based on the best information available in recording transactions and balances resulting from business operations. As better information becomes available or actual amounts are known, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.
Recent Accounting Pronouncements
Segment Reporting. In November 2023, the Financial Accounting Standards Board (FASB) issued amended authoritative guidance codified in Accounting Standards Codification (ASC) 280, Segment Reporting. The amended guidance expands annual and interim disclosure requirements for reportable segments, primarily through expanded disclosures about significant segment expenses. The updated standard is effective for our annual periods beginning in 2024 and interim periods beginning in the first quarter of fiscal year 2025. Adoption of the amended guidance must be applied retrospectively to all prior periods presented in the financial statements. Beginning with the filing of our 2024 Form 10-K, we will provide the additional disclosures required by the updated standard, including the disclosure of additional expense details for each of our identified reportable segments.
Income Taxes. In December 2023, the FASB issued amended authoritative guidance codified in ASC 740, Income Taxes. The amended guidance requires additional disaggregated information in effective tax rate reconciliation disclosures and additional disaggregated information about income taxes paid. The updated standard is effective for our annual periods beginning in 2025. The amended guidance is to be applied on a prospective basis with the option to apply the standard retrospectively. We anticipate adopting the updated standard in our Form 10-K for the year ended December 31, 2025 and electing to apply the standard on a retrospective basis for all periods presented.
2. Segment Information
The classification of our business into three segments, Electric, Manufacturing and Plastics, is consistent with our business strategy, organizational structure and our internal reporting and review processes used by our chief operating decision maker to make decisions regarding allocation of resources, to assess operating performance and to make strategic decisions.
Certain assets and costs are not allocated to our operating segments. Corporate operating costs include items such as corporate staff and overhead costs, the results of our captive insurance company and other items excluded from the measurement of operating segment performance. Corporate assets consist primarily of cash and cash equivalents, prepaid expenses, investments and fixed assets. Corporate is not an operating segment, rather it is added to operating segment totals to reconcile to consolidated amounts.
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Information for each segment and our unallocated corporate costs for the three and six months ended June 30, 2024 and 2023 are as follows:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Operating Revenue
Electric$112,828 $113,763 $254,317 $265,671 
Manufacturing96,684 102,475 196,065 209,257 
Plastics132,824 121,478 239,022 201,869 
Total$342,336 $337,716 $689,404 $676,797 
Net Income (Loss)
Electric$18,485 $19,634 $40,956 $42,854 
Manufacturing6,835 5,969 12,096 12,831 
Plastics60,612 55,392 107,350 89,078 
Corporate1,063 974 931 (313)
Total$86,995 $81,969 $161,333 $144,450 
The following provides the identifiable assets by segment and corporate assets as of June 30, 2024 and December 31, 2023:
(in thousands)June 30,
2024
December 31,
2023
Identifiable Assets
Electric$2,634,116 $2,533,831 
Manufacturing261,219 251,343 
Plastics215,795 164,179 
Corporate349,653 293,215 
Total$3,460,783 $3,242,568 
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3. Revenue
Presented below are our operating revenues from external customers, in total and by amounts arising from contracts with customers and alternative revenue program (ARP) arrangements, disaggregated by revenue source and segment for the three and six months ended June 30, 2024 and 2023:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Operating Revenues
Electric Segment
Retail: Residential$26,369 $26,974 $65,824 $70,951 
Retail: Commercial and Industrial68,191 64,989 151,221 155,474 
Retail: Other1,822 1,752 3,826 3,743 
  Total Retail96,382 93,715 220,871 230,168 
Transmission12,440 14,829 24,654 26,936 
Wholesale1,669 2,670 5,134 4,508 
Other2,337 2,549 3,658 4,059 
Total Electric Segment112,828 113,763 254,317 265,671 
Manufacturing Segment
Metal Parts and Tooling88,152 89,396 176,067 179,463 
Plastic Products and Tooling6,467 10,068 15,453 24,211 
Scrap Metal2,065 3,011 4,545 5,583 
Total Manufacturing Segment96,684 102,475 196,065 209,257 
Plastics Segment
PVC Pipe132,824 121,478 239,022 201,869 
Total Operating Revenue342,336 337,716 689,404 676,797 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(62)(334)(234)(1,545)
Total Operating Revenues from Contracts with Customers$342,398 $338,050 $689,638 $678,342 
4. Select Balance Sheet Information
Receivables and Allowance for Credit Losses
Receivables as of June 30, 2024 and December 31, 2023 are as follows:
(in thousands)June 30,
2024
December 31,
2023
Receivables
Trade$164,098 $129,257 
Other9,725 9,084 
Unbilled Receivables20,149 21,324 
Total Receivables193,972 159,665 
Less: Allowance for Credit Losses2,026 2,522 
Receivables, net of allowance for credit losses$191,946 $157,143 
The following is a summary of activity in the allowance for credit losses for the six months ended June 30, 2024 and 2023:
(in thousands)20242023
Beginning Balance, January 1$2,522 $1,648 
Additions Charged to Expense471 1,001 
Reductions for Amounts Written Off, Net of Recoveries(967)(435)
Ending Balance, June 30
$2,026 $2,214 
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Inventories
Inventories consist of the following as of June 30, 2024 and December 31, 2023:
(in thousands)June 30,
2024
December 31,
2023
Raw Material, Fuel and Supplies$85,795 $75,733 
Work in Process27,435 26,354 
Finished Goods48,557 47,614 
Total Inventories$161,787 $149,701 
Investments
The following is a summary of our investments as of June 30, 2024 and December 31, 2023:
(in thousands)June 30,
2024
December 31,
2023
Short-term Investments
Government Debt Securities
$469 $ 
Corporate Debt Securities
590  
Total Short-term Investments
$1,059 $ 
Long-term Investments
Corporate-Owned Life Insurance Policies$44,534 $42,287 
Government Debt Securities
58,749 7,724 
Corporate Debt Securities
1,025 1,579 
Money Market Funds2,606 3,125 
Mutual Funds10,121 7,771 
Other Investments27 30 
Total Long-term Investments
117,062 62,516 
Total Investments$118,121 $62,516 
The amount of unrealized gains and losses on debt securities as of June 30, 2024 and December 31, 2023 was not material and no unrealized losses were deemed to be other-than-temporary. In addition, the amount of unrealized gains and losses on marketable equity securities still held as of June 30, 2024 and December 31, 2023 was not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of June 30, 2024 and December 31, 2023 include:
(in thousands)June 30,
2024
December 31,
2023
Electric Plant  
Electric Plant in Service$3,055,265 $2,989,881 
Construction Work in Progress199,338 137,212 
Total Gross Electric Plant3,254,603 3,127,093 
Less Accumulated Depreciation and Amortization879,268 851,148 
Net Electric Plant2,375,335 2,275,945 
Nonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in Service325,067 311,924 
Construction Work in Progress54,054 38,062 
Total Gross Nonelectric Property, Plant and Equipment379,121 349,986 
Less Accumulated Depreciation and Amortization215,615 207,556 
Net Nonelectric Property, Plant and Equipment163,506 142,430 
Net Property, Plant and Equipment$2,538,841 $2,418,375 
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5. Regulatory Matters
Regulatory Assets and Liabilities
The following presents our current and long-term regulatory assets and liabilities as of June 30, 2024 and December 31, 2023 and the period we expect to recover or refund such amounts:
Period ofJune 30, 2024December 31, 2023
(in thousands)Recovery/RefundCurrentLong-TermCurrentLong-Term
Regulatory Assets
Pension and Other Postretirement Benefit Plans1
Various$154 $86,057 $154 $86,134 
Alternative Revenue Program Riders2
Up to 2 years
3,548 95 3,719 158 
Deferred Income TaxesAsset lives 7,187  6,940 
Fuel Clause Adjustments1
Up to 1 year
1,663  7,294  
Derivative Instruments1
Up to 2 years
1,516 462 4,210  
Other1
Various1,291 1,804 750 2,483 
Total Regulatory Assets$8,172 $95,605 $16,127 $95,715 
Regulatory Liabilities
Deferred Income TaxesAsset lives$ $133,412 $ $136,022 
Plant Removal ObligationsAsset lives 117,499  117,030 
Fuel Clause Adjustments
Up to 1 year
24,055  11,350  
Alternative Revenue Program Riders
Up to 1 year
13,879  6,885  
North Dakota PTC RefundsAsset lives 14,612  12,011 
Pension and Other Postretirement Benefit PlansVarious6,138 8,894 6,138 11,307 
OtherVarious1,111 651 1,035 177 
Total Regulatory Liabilities$45,183 $275,068 $25,408 $276,547 
1Costs subject to recovery without a rate of return.
2Amounts eligible for recovery includes an incentive or rate of return.
6. Asset Retirement Obligations
We have recognized Asset Retirement Obligations (AROs) related to our coal-fired generation plants, natural gas combustion turbines, solar facility and wind turbines. The cost of AROs include items such as site restoration, closure of ash pits and removal of certain structures, generators, asbestos and storage tanks. We have other legal obligations associated with the retirement of a variety of other long-lived tangible assets used in electric operations where the estimated settlement costs are individually and collectively immaterial. We have no assets legally restricted for the settlement of any AROs.
As of June 30, 2024 and December 31, 2023, $0.1 million and $0.1 million, respectively, was included in other current liabilities and $38.4 million and $36.4 million, respectively, was included in other noncurrent liabilities in the consolidated balance sheets related to AROs.
Coal Combustion Residual Regulations
In May 2024, the EPA published a final rule amending coal combustion residual (CCR) regulations which introduces new requirements for the management of coal ash at active coal-fired power plants and inactive coal-fired power plants with a legacy surface impoundment. The regulations impose new requirements including groundwater monitoring, closure standards, post-closure care obligations, and potential remediation activities.
As of June 30, 2024, we have not recognized an ARO for any liabilities which may be incurred because of the EPA’s final CCR rule as we cannot reasonably estimate the fair value of such a liability. We continue to review and assess the complex regulation to determine whether and to what extent, if any, our facilities will be impacted. Specifically, we are evaluating certain definitional matters within the regulation to determine the boundaries of an active facility and the closure standards at an active facility. In addition, we are evaluating whether existing equivalent regulatory authority is present for any of our facilities which may reduce or eliminate compliance obligations.
If it is determined that any of our facilities are impacted and new requirements are imposed by the regulation, we will recognize an ARO as soon as we are able to reasonably estimate the fair value of the liability.
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7. Short-Term and Long-Term Borrowings
The following is a summary of our outstanding short- and long-term borrowings by borrower, OTC or OTP, as of June 30, 2024 and December 31, 2023:
Short-Term Debt
The following is a summary of our lines of credit as of June 30, 2024 and December 31, 2023:
June 30, 2024December 31,
2023
(in thousands)Borrowing LimitAmount OutstandingLetters
of Credit
Amount AvailableAmount Available
OTC Credit Agreement$170,000 $ $ $170,000 $170,000 
OTP Credit Agreement170,000 12,809 9,132 148,059 79,446 
Total$340,000 $12,809 $9,132 $318,059 $249,446 
Long-Term Debt
The following is a summary of outstanding long-term debt by borrower as of June 30, 2024 and December 31, 2023: 
(in thousands)
BorrowerDebt InstrumentRateMaturityJune 30,
2024
December 31,
2023
OTCGuaranteed Senior Notes3.55 %12/15/26$80,000 $80,000 
OTPSeries 2007C Senior Unsecured Notes6.37 %08/02/2742,000 42,000 
OTPSeries 2013A Senior Unsecured Notes4.68 %02/27/2960,000 60,000 
OTPSeries 2019A Senior Unsecured Notes3.07 %10/10/2910,000 10,000 
OTPSeries 2020A Senior Unsecured Notes3.22 %02/25/3010,000 10,000 
OTPSeries 2020B Senior Unsecured Notes3.22 %08/20/3040,000 40,000 
OTPSeries 2021A Senior Unsecured Notes2.74 %11/29/3140,000 40,000 
OTPSeries 2024A Senior Unsecured Notes5.48 %04/01/3460,000  
OTPSeries 2007D Senior Unsecured Notes6.47 %08/20/3750,000 50,000 
OTPSeries 2019B Senior Unsecured Notes3.52 %10/10/3926,000 26,000 
OTPSeries 2020C Senior Unsecured Notes3.62 %02/25/4010,000 10,000 
OTPSeries 2013B Senior Unsecured Notes5.47 %02/27/4490,000 90,000 
OTPSeries 2018A Senior Unsecured Notes4.07 %02/07/48100,000 100,000 
OTPSeries 2019C Senior Unsecured Notes3.82 %10/10/4964,000 64,000 
OTPSeries 2020D Senior Unsecured Notes3.92 %02/25/5015,000 15,000 
OTPSeries 2021B Senior Unsecured Notes3.69 %11/29/51100,000 100,000 
OTPSeries 2022A Senior Unsecured Notes3.77 %05/20/5290,000 90,000 
OTPSeries 2024B Senior Unsecured Notes5.77 %04/01/5460,000  
Total$947,000 $827,000 
Less:Unamortized Long-Term Debt Issuance Costs3,408 2,941 
Total Long-Term Debt, Net of Unamortized Debt Issuance Costs$943,592 $824,059 
On March 28, 2024, OTP entered into a Note Purchase Agreement pursuant to which OTP issued, in a private placement transaction, $120.0 million of senior unsecured notes consisting of (a) $60.0 million of 5.48% Series 2024A Senior Unsecured Notes due April 1, 2034, and (b) $60.0 million of 5.77% Series 2024B Senior Unsecured Notes due April 1, 2054.
Per the terms of the agreement, OTP may prepay all or any part of the notes (in an amount not less than 10% of the aggregate principal amount of the notes then outstanding in the case of a partial prepayment) at 100% of the principal amount so prepaid, together with unpaid accrued interest and a make-whole amount, as defined in the agreement; provided that no default or event of default exists under the agreement. Any prepayment made by the Company of all of the Series 2024A Notes then outstanding on or after January 1, 2034, or the Series 2024B Notes then outstanding on or after October 1, 2053, will be made without any make-whole amount. Consistent with other borrowings, the agreement contains a number of restrictions on the business of OTP, including
13

restrictions on OTP’s ability to merge, sell substantially all assets, create or incur liens on assets, guarantee the obligations of any other party, and engage in certain transactions with affiliates.
Financial Covenants
Certain of OTC's and OTP's short- and long-term debt agreements require the borrower, whether OTC or OTP, to maintain certain financial covenants, including a maximum debt to total capitalization ratio of 0.60 to 1.00, a minimum interest and dividend coverage ratio of 1.50 to 1.00, and a maximum level of priority indebtedness. As of June 30, 2024, OTC and OTP were in compliance with these financial covenants.
8. Employee Postretirement Benefits
Pension Plan and Other Postretirement Benefits
The Company sponsors a noncontributory funded pension plan (the "Pension Plan"), an unfunded, nonqualified Executive Survivor and Supplemental Retirement Plan (the "ESSRP"), both accounted for as defined benefit pension plans, and a postretirement healthcare plan accounted for as an other postretirement benefit plan.
The following tables include the components of net periodic benefit cost (income) related to our defined benefit pension plans and other postretirement benefits for the three and six months ended June 30, 2024 and 2023:
Three Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$971 $924 $ $18 $122 $153 
Interest Cost4,297 4,109 474 473 400 669 
Expected Return on Assets(6,379)(6,478)    
Amortization of Prior Service Cost    (1,575)(1,434)
Amortization of Net Actuarial Loss39      
Net Periodic Benefit Cost (Income)$(1,072)$(1,445)$474 $491 $(1,053)$(612)
Six Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$1,943 $1,849 $ $36 $245 $306 
Interest Cost8,594 8,218 948 945 800 1,338 
Expected Return on Assets(12,759)(12,957)    
Amortization of Prior Service Cost    (3,151)(2,867)
Amortization of Net Actuarial Loss79      
Net Periodic Benefit Cost (Income)$(2,143)$(2,890)$948 $981 $(2,106)$(1,223)
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three and six months ended June 30, 2024 and 2023:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Net Periodic Benefit Cost (Income)$(1,651)$(1,566)$(3,301)$(3,132)
Net Amount Amortized Due to the Effect of Regulation356 240 659 490 
Net Periodic Benefit Cost (Income) Recognized$(1,295)$(1,326)$(2,642)$(2,642)
We had no minimum funding requirements for our Pension Plan or any other postretirement benefit plans as of December 31, 2023. We did not make any contributions to our Pension Plan during the six months ended June 30, 2024 and 2023.
14

9. Income Taxes
The Company's effective tax rate was 19.2%, and 19.7% for the three months ended June 30, 2024 and 2023 and 19.2% and 18.8% for the six months ended June 30, 2024 and 2023. These rates differed from the federal statutory rate of 21% primarily due to the impact of production tax credits (PTCs) associated with the energy generation of our wind and solar assets, partially offset by state taxes.
10. Commitments and Contingencies
Contingencies
FERC Return on Equity (ROE). In November 2013 and February 2015, customers filed complaints with the Federal Energy Regulatory Commission (FERC) seeking to reduce the ROE component of the transmission rates that MISO transmission owners, including OTP, may collect under the MISO tariff rate. FERC's most recent order, issued on November 19, 2020, adopted a revised ROE methodology and set the base ROE at 10.02% (10.52% with an adder) effective for the fifteen-month period from November 2013 to February 2015 and on a prospective basis beginning in September 2016. The order also dismissed any complaints covering the period from February 2015 to May 2016. On August 9, 2022, the U.S. Court of Appeals for the District of Columbia Circuit vacated the FERC order citing a lack of reasoned explanation by FERC in its adoption of its revised ROE methodology as outlined in its November 2020 order and remanded the matter to FERC to reopen the proceedings. In July 2024, FERC counsel indicated that the FERC plans to act within 120 days on the U.S. Court of Appeals remand and that the expectation is there will be no further briefings on the matter; rather, FERC intends to issue an order based on the record developed to date to resolve the ROE matter and remand proceedings.
Although FERC has indicated they will act on the remand before the end of the year, uncertainty remains as to what specific actions FERC will take in their final order. As a result, we have continued to defer recognition of certain revenues and recognize a refund liability related to this matter. The balance of the recorded refund liability was $2.9 million as of June 30, 2024, which is included in other current liabilities on the consolidated balance sheets. This refund liability reflects our best estimate of amounts previously collected from customers under the MISO tariff rate that may be required to be refunded to customers once all regulatory and judicial proceedings are complete and a final ROE is established for the periods outlined above.
Regional Haze Rule (RHR). The RHR was adopted in an effort to improve visibility in national parks and wilderness areas. The RHR requires states, in coordination with the Environmental Protection Agency (EPA) and other governmental agencies, to develop and implement plans to achieve natural visibility conditions. The second RHR implementation period covers the years 2018-2028. States are required to submit a state implementation plan to assess reasonable progress with the RHR and determine what additional emission reductions are appropriate, if any.
Coyote Station, OTP's jointly owned coal-fired power plant in North Dakota, is subject to assessment in the second implementation period under the North Dakota state implementation plan. The North Dakota Department of Environmental Quality (NDDEQ) submitted its state implementation plan to the EPA for approval in August 2022. In its plan, the NDDEQ concluded it is not reasonable to require additional emission controls during this planning period.
In June 2023, a coalition of environmental organizations filed a lawsuit against the EPA for failing to enforce the RHR. In response, the EPA proposed, through a consent decree filed in the U.S. District Court for the District of Columbia in March 2024, a timeline for it to act on 34 outstanding state implementation plans. Under the consent decree, which was issued on July 12, 2024, the EPA would approve, deny, partially approve or issue a federal implementation plan at assigned dates between 2024 and 2026, including a final decision on the North Dakota state implementation plan by November 2024.
In July 2024, the EPA published its proposed rule for North Dakota’s state implementation plan, in which the EPA proposed to approve certain aspects of the state implementation plan and disapprove of other aspects of the plan. The EPA proposes to find that North Dakota failed to submit a long-term strategy that includes enforceable emissions limitations, compliance schedules, and other measures necessary to make reasonable progress on national visibility goals. Specific to Coyote Station, the EPA contends North Dakota relied on non-statutory visibility modeling to reject the installation of emission controls. The EPA also proposes to find the North Dakota plan does not adequately demonstrate that existing limits for NOx and SO2 at Coyote Station are sufficient to ensure progress towards the national visibility goals. The proposed rule remains subject to a 30-day comment period. We continue to anticipate final EPA action by November 2024.
We cannot predict with certainty the final resolution of regional haze compliance in North Dakota and specifically the impact, if any, on the operations of Coyote Station. However, significant emission control investments could be required and the recovery of such costs from customers would require regulatory approval. Alternatively, investments in emission control equipment may prove to be uneconomic and result in the early retirement, or sale, of our interest in Coyote Station, which would be subject to regulatory approval. We cannot estimate the ultimate financial effects such a retirement or sale may have on our consolidated operating
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results, financial position or cash flows, but such amounts could be material and the recovery of such costs in rates would be subject to regulatory approval.
Self-Funding of Transmission Upgrades for Generator Interconnections. The FERC has granted transmission owners within MISO the unilateral authority to determine the funding mechanism for interconnection transmission upgrades that are necessary to accommodate new generation facilities connecting to the electrical grid. Under existing FERC orders, transmission owners can unilaterally determine whether the generator pays the transmission owner in advance for the transmission upgrade or, alternatively, the transmission owner can elect to fund the upgrade and recover over time from the generator the cost of and a return on the upgrade investment (a self-funding). FERC’s orders granting transmission owners this unilateral funding authority have been judicially contested on the basis that transmission owners may be motivated to discriminate among generators in making funding determinations. In the most recent judicial proceedings, the petitioners argued to the U.S. Court of Appeals for the District of Columbia that FERC did not comply with a previous judicial order to fully develop a record regarding the risk of discrimination and the financial risk absorbed by transmission owners for generator-funded upgrades. In December 2022, the Court of Appeals ruled in favor of the petitioners remanding the matter to FERC, instructing the agency to adequately explain the basis of its orders. The Court of Appeals decision did not vacate transmission owners’ unilateral funding authority.
On June 13, 2024, FERC issued an Order to Show Cause proceeding against four Regional Transmission Organizations (RTOs), including MISO. Within its order, FERC indicates that the transmission tariffs of the RTOs appear to be unjust, unreasonable, and unduly discriminatory or preferential because they allow transmission owners to unilaterally elect transmission owner self-funding, which may increase costs, impose barriers to transmission interconnection and result in undue discrimination among interconnection customers.
The order requires each RTO to submit filings to either 1) show cause as to why the transmission tariff remains just and reasonable and not duly discriminatory or preferential, or 2) to explain what changes to the tariff it believes would remedy the identified concerns. The RTO filings are due 90 days after the order was issued and interested entities may file within 30 days thereafter to address the RTOs filings. The order also stipulates that if no final decision is reached by the conclusion of a 180-day period from the issuance of the order, FERC shall state the reasons why it did not act and provide its best estimate when it expects to issue a decision. FERC contemporaneously issued an order suspending the pending remand on the related case.
On July 15, 2024, a group of utilities, not including OTP, submitted to FERC a request for rehearing of the order on the basis of the legal and statutory authority of the order. In the alternative, the utilities also requested FERC rescind or withdraw the order.
OTP, as a transmission owner in MISO, has exercised its authority and elected to self-fund previous transmission upgrades necessary to accommodate new system generation. Under such an election, OTP is recovering the cost of the transmission upgrade and a return on that investment from the generator over a contractual period of time. Should the resolution of this matter eliminate transmission owners’ unilateral funding authority on either a prospective or retrospective basis, our financial results would be impacted. We cannot at this time reasonably predict the outcome of this matter given the uncertainty as to how FERC may ultimately decide on the matter after RTO's filings in response to the Order to Show Cause.
Other Contingencies. We are party to litigation and regulatory matters arising in the normal course of business. We regularly analyze relevant information and, as necessary, estimate and record accrued liabilities for legal, regulatory enforcement and other matters in which a loss is probable of occurring and can be reasonably estimated. We believe the effect on our consolidated operating results, financial position and cash flows, if any, for the disposition of all matters pending as of June 30, 2024, other than those discussed above, will not be material.
11. Stockholders' Equity
Registration Statements
On May 3, 2024, we filed a shelf registration statement with the SEC under which we may offer for sale, from time to time, either separately or together in any combination, equity, debt or other securities described in the shelf registration statement. No new debt or equity has been issued pursuant to the registration statement. The registration statement expires in May 2027.
On May 3, 2024, we filed a second registration statement with the SEC for the issuance of up to 1,500,000 common shares under an Automatic Dividend Reinvestment and Share Purchase Plan, which provides shareholders, retail customers of OTP and other interested investors methods of purchasing our common shares by reinvesting their dividends or making optional cash investments. Shares purchased under the plan may be newly issued common shares or common shares purchased on the open market. During the six months ended June 30, 2024, we issued 46,003 shares under this plan. We repurchased a sufficient number of shares on the open market to satisfy issuance under the plan; accordingly, no proceeds from the issuance were received. As of June 30, 2024, there were 1,099,327 shares available for purchase or issuance under the plan. The registration statement expires in May 2027.
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Dividend Restrictions
OTC is a holding company with no significant operations of its own. The primary source of funds for payments of dividends to OTC's shareholders is from dividends paid or distributions made by OTC's subsidiaries. As a result of certain statutory limitations or regulatory or financing agreements, the amount of distributions allowed to be made by OTC's subsidiaries or the amount of dividends paid by OTC could be restricted. Both the OTC Credit Agreement and the OTP Credit Agreement contain restrictions on the payment of cash dividends upon a default or event of default, including failure to maintain certain financial covenants. As of June 30, 2024, we were in compliance with these financial covenants.
Under the Federal Power Act, a public utility may not pay dividends from any funds properly included in a capital account. What constitutes “funds properly included in a capital account” is undefined in the Federal Power Act or the related regulations; however, the FERC has consistently interpreted the provision to allow dividends to be paid as long as i) the source of the dividends is clearly disclosed, ii) the dividend is not excessive and iii) there is no self-dealing on the part of corporate officials.
The Minnesota Public Utilities Commission indirectly limits the amount of dividends OTP can pay to OTC by requiring an equity-to-total-capitalization ratio between 48.3% and 59.1% based on OTP’s current capital structure requirements. As of June 30, 2024, OTP’s equity-to-total-capitalization ratio, including short-term debt, was 52.9% and its net assets restricted from distribution totaled approximately $819 million. Under the MPUC order, total capitalization for OTP cannot exceed $2.0 billion.
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12. Accumulated Other Comprehensive Income (Loss)
The following presents the changes in accumulated other comprehensive income (loss) for the three and six months ended June 30, 2024 and 2023:
Three Months Ended June 30,
20242023
(in thousands)Pension and Other Postretirement Benefits
Net Unrealized Losses on Available-for-Sale Securities
TotalPension and Other Postretirement BenefitsNet Unrealized Gains (Losses) on Available-for-Sale SecuritiesTotal
Balance, Beginning of Period$1,301 $(240)$1,061 $1,308 $(339)$969 
Other Comprehensive Loss Before Reclassifications, net of tax
 (220)(220) (62)(62)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)(29)
(1)
(49)
(2)
(