Diana Furchtgott-Roth: The blackout in Spain is a wake-up call about the risks of relying too much on solar and wind

Spain 's electricity supply went down last month due to cascading failures traced to faults in two solar plants in Spain ’s southwest region, causing a blackout on the Iberian Peninsula .

North American Electric Reliability Corp. forecasts inadequate current U.S. electricity supplies as coal and some gas-fired generators face retirement and energy demand is growing.