The Company owns 99.3% of its subsidiary, Genie Energy International Corporation ("GEIC"), which owns 100% of Genie Retail Energy ("GRE"), 100% of Genie Energy Services ("GES"), 60% of Prism Solar Technology, Inc. ("Prism") and 97% of Genie Oil and Gas, Inc. ("GOGAS").
GRE, owns and operates retail energy providers, ("REPs"), including IDT Energy, Inc. ("IDT Energy"), Residents Energy, LLC ("Residents Energy"), Town Square Energy ("TSE"), Southern Federal Power ("SFP") and Mirabito Natural Gas, ("Mirabito"). Its REP businesses resell electricity and natural gas to residential and business customers primarily in the Eastern United States. Internationally, GRE manages our interest in a joint venture that serves retail customers in the United Kingdom ("U. K.") and our business in Japan recently launched commercial operations. In January 2019, we acquired an 80% controlling interest in Lumo Energia Ojy ("Lumo"), a REP with approximately 32,000 residential customers in Finland.
GES oversees Diversegy LLC ("Diversegy"), a retail energy advisory and brokerage company that serves commercial and industrial customers throughout the U.S. and manages our 60% controlling interest in Prism, a solar solutions company that is engaged in U.S. based manufacturing of solar panels, solar installation design and project management.