Adding capacity to the electricity grid is not a simple task

Chill sun solar, a facility in Nevada with a generating capacity of 2.25GW, should produce enough electricity to meet 1.7% of California’s annual demand. The 4.1GW Berwick Bank wind farm, off the east coast of Scotland, will provide more energy over a year than could Britain’s two largest gas-fired power stations running full tilt. But none of this will matter until these renewable heavyweights get hooked up to their respective grids.