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National Grid owns and operates the electric transmission system in England and Wales. It sold the bulk of its UK gas transmission business in fiscal 2023 to fund the acquisition of PPL's UK power distribution assets. In the Northeastern United States, it serves electricity and gas customers combined in three states. It also owns regulated transmission and electricity generation in the United States, metering services, merchant transmission lines in the UK, and the Grain (UK) liquefied natural gas facility.
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, and solar power generation along with one of the largest utility-scale battery projects in the world. 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.