Texas' grid operator hasn't said how many power plants — or which ones — went offline last week, causing it to ask Texans to cut back on power usage during a June heat wave. 

"Some Texas power plants unexpectedly went offline last week. The grid operator says it still doesn’t know why" was first published by The Texas Tribune, a nonprofit, nonpartisan media organization that informs Texans — and engages with them — about public policy, politics, government and statewide issues.

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