This is the first of two Hybrid Electric Gas Turbine (EGT) units that GE has delivered to electricity provider SCE, combining a 10MW/4.3MWh battery system with a gas turbine. The battery provides quick start, fast ramping capabilities when they are needed while the 50MW LM6000 gas turbine powers up. This reduces the need for the turbine to be running in standby, cutting emissions by 60% and saving 2m gallons of demineralized water a year, as well as extending the life of the turbine.
“The new system will help SCE better use the resources on the grid, provide enhanced reliability, reduce environmental impact, and reduce cost for our operations and for our customers,” said Ron Nichols, president of SCE. “This technology also allows us to continue to expand our use of solar, wind and other renewable resources.”
The key to the Hybrid EGT is the control system from GE Digital Grid that blends the output of the battery and the gas turbine. The energy storage capacity of the battery has been specifically designed to provide enough time coverage to allow the gas turbine to start and reach its designated power output. As a result, the system does not need to burn fuel and consume water in stand-by mode to be able to dispatch power immediately when demand surges. The control system can link to a range of battery technologies.
“As the electrical grid network continues to evolve, with more intermittent renewables being added every day, products like the Hybrid EGT can help smooth out the delivery of electricity,” said Reinaldo Garcia, President and CEO of Grid Solutions from GE Energy Connections. “Storage and the ability to quickly push power to the grid also play a key role in emergency situations, dispatching energy immediately to the grid ensuring that we are able help keep the lights on for everyone.”