Texas Tribune

On Thursday, Texas’ power grid operator told at least one power plant to delay its scheduled repairs and keep operating to help meet demand during hotter-than-expected May weather.

The next day, the plant went offline anyway when some of its equipment stopped working properly, according to energy giant Calpine, which owns the plant.

By just after 5 p.m. Friday, the Electric Reliability Council of Texas announced that six power plants had gone down unexpectedly and asked Texans t...