Vistra Corp. VST said Monday it will pay $3 billion to acquire Energy Harbor Corp. and combine it with a new unit called Vistra Vision, a retail electricity and zero-carbon generation company. Vistra Vision will own four nuclear power plants with 6,400 megawatts of power, with a renewables and energy storage portfolio. Energy Harbor’s two largest shareholders, Avenue Capital Group and Nuveen, will receive a combination of cash and the 15% ownership interest. Vistra Vision will assume $430 million of net debt from Energy Harbor in the transaction.