The biggest power plant in the USA, in terms of electricity generation capacity, is the **Grand Coulee Dam**. Located on the Columbia River in Washington State, the Grand Coulee Dam is a massive hydroelectric power plant with a generating capacity of about **6,809 megawatts (MW)**.
This capacity makes it the largest in the country by installed capacity, although itβs worth noting that the total power generation of a facility can vary depending on factors such as water availability and operational conditions. The Grand Coulee Dam plays a crucial role in providing electricity, irrigation, and flood control for the region.