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Eversource Energy is a diversified holding company with subsidiaries that provide rate-regulated electric and gas distribution service to more than 4 million customers in the Northeast US. The company plans to sell its water utility, Aquarion, in 2025. Eversource expanded its service territories with acquisitions of NStar (2012), Aquarion (2017), and Columbia Gas (2020). In 2024 Eversource exited its 50% partnership with European utility Orsted to develop 2 gigawatts of offshore wind projects in the Northeast US. The company exited most of its unregulated businesses in 2006.

Vistra Energy is one of the largest power producers and retail energy providers in the US. Following the 2024 Energy Harbor acquisition, Vistra owns 41 gigawatts of nuclear, coal, natural gas, solar, and energy storage assets. Its retail electricity business serves 5 million customers in 20 states, including almost a third of all Texas electricity consumers. Vistra emerged from the Energy Future Holdings bankruptcy as a stand-alone entity in 2016. It acquired Dynegy in 2018.

MGE Energy provides electric service to 161,000 customers and natural gas service to 173,000 customers in Madison, Wisconsin, and surrounding areas. Nearly 90% of customers are residential. The company also owns a 3.6% stake in American Transmission Co. MGE owns interests in two coal power plants that earn guaranteed fixed rates of return, contributing about 20% of earnings. MGE's generation mix is 40% coal, 21% renewable energy, 17% natural gas, and third-party purchased power.

PPL Corp., based in Allentown, Pennsylvania, is a gas and electric utility with generation, transmission, distribution, and wholesale operations. The company has 3.5 million customers. PPL has regulated utility operations in Pennsylvania (PPL Electric, 1.4 million customers), Kentucky (KU and Louisville Gas and Electric, 1.3 million), Virginia (less than 0.1 million), and Rhode Island (Rhode Island Energy, 0.8 million). In 2024, revenues were about $8.5 billion with Kentucky Regulated contributing 42% and Pennsylvania Regulated accounting for 34% of the total. PPL has significant coal usage as a generating fuel. Management is targeting net-zero emissions by 2050, which is in line with utilities with coal plants. In addition to adding generation assets to its rate base, management has been reporting an uptick in future data center demand requests, which should drive transmission upgrades. The company's market cap is $27 billion.