"The incurable intermittency and extreme variability of wind energy requires utilities and grid operators to continue relying on conventional sources of generation like coal, natural gas, and nuclear fuel. Nevertheless, 29 states, plus the District of Columbia, now have renewable-energy mandates."
Hot? Don’t count on wind energy to cool you down. That’s the lesson emerging from the stifling heat wave that’s hammering Texas.
Over the past week or so, Texans have been consuming record-breaking quantities of electricity, and ERCOT, the state’s grid operator, has warned of rolling blackouts if customers don’t reduce their consumption.
Texas has 10,135 megawatts of installed wind-generation capacity. That’s nearly three times as much as any other state. But during three sweltering days last week, when the state set new records for electricity demand, the state’s vast herd of turbines proved incapable of producing any serious amount of power.
Consider the afternoon of August 2, when electricity demand hit 67,929 megawatts. Although electricity demand and prices were peaking, output from the state’s wind turbines was just 1,500 megawatts, or about 15 percent of their total nameplate capacity. Put another way, wind energy was able to provide only about 2.2 percent of the total power demand even though the installed capacity of Texas’s wind turbines theoretically equals nearly 15 percent of peak demand. This was no anomaly. On four days in August 2010, when electricity demand set records, wind energy was able to contribute just 1, 2, 1, and 1 percent, respectively, of total demand.
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