Variability of Wind and Solar Increase Costs of Reliable Energy Sources

(p. A17) President Trump mocked the Democrats’ Green New Deal and its renewable-energy aspirations in a recent speech: “When the wind stops blowing, that’s the end of your electric.” But the most destructive consequence of wind and solar power result from periods of oversupply.
Coal and gas generating plants have to be kept on standby and ramped up to cover the shortfall resulting from still air and darkness. That forces them to operate less efficiently and pushes their costs up. During periods of low demand, wind and solar can produce too much electricity, creating gluts and driving wholesale prices negative, meaning grid operators have to pay consumers to burn unwanted energy. That makes nuclear, coal and gas generators unprofitable, necessitating extra subsidies to save the power stations needed to keep the lights on.

For the full commentary, see:
Rupert Darwall. “When There’s Too Much Sun and Wind; The biggest danger of renewable energy is overproduction.” The Wall Street Journal (Monday, March 11, 2019): A17.
(Note: the online version of the commentary has the date March 10, 2019.)

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