(Bloomberg) -- Texas is facing a potential electricity emergency this weekend, the fourth time in the past month the state’s grid operator has issued such a warning. 

The Electric Reliability Council of Texas says the grid may reach emergency conditions, from Friday at 7 p.m. local time through 9 p.m. Saturday, according to a notice posted online. Ercot currently expects to have as much as 62.7 gigawatts of power available when supplies are expected to be tightest Friday evening, about 6.3 gigawatts more than projected demand. It shifts to emergency operations when demand comes within 2.5 gigawatts of available supply. 

Read More: Texas Warned of Blackout Risk as Sun Sets This Summer

The grid operator issued a similar warning last week when reserves plunged when wind generation slumped just as a large amount of power plants were offline for seasonal maintenance.

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