The Eastern Interconnection is one of the two major alternating-current (AC) electrical grids in the North American power transmission grid. The other major interconnection is the Western Interconnection. The three minor interconnections are the Quebec, Alaska, and Texas interconnections. In 2016, National Renewable Energy Laboratory simulated a year with 30% renewable energy (wind and solar power) in 5-minute intervals. Results show a stable grid with some changes in operation.