Last week in California, solar power generated aroundLinks to an external site. 14 GW during the day. When the sun goes down, other sources must ramp up generation by around 18 GW in order to match the decrease in solar generation and increases in load (electricity demand peaks in the evening). Which of the following power sources can ramp up generation rapidly enough to help balance the load within approximately one hour?
a. Battery storage
b. Hydroelectricity
c. Fossil gas open cycle
d. Existing nuclear