Four mothballed power plants will come back online in the coming weeks to help ensure Texas’ main electric grid can handle demand for the rest of the summer.

Two Houston-area plants owned by NRG Energy and two near Dallas owned by Garland Power & Light will return to service at the request of the Electric Reliability Council of Texas.

NRG says the two natural gas-fired units at the SR Bertron plant in Deer Park along the Ship Channel should be up and running by Sept. 1. The units, with a combined generating capacity of 292 megawatts, were taken offline in 2010.

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