As the Texas electoral grid labors under an intense heatwave, Tesla, Toyota, and Samsung have been forced to scale back manufacturing activity at their factories to help lighten the load in the state’s electrical grid.

In response to a request from the power grid operator in Texas, the Electric Reliability Council of Texas (ERCOT), Toyota’s San Antonio plant has cut back on the number of production hours to conserve power.  According to a spokesperson, Toyota will stop production before 2PM and reduce night shifts.

On Wednesday, ERCOT asked businesses and consumers to begin to take measures to conserve power on July 11th to avoid rolling blackouts, as temperatures began to rise to over 100 degrees

Toyota had previously scheduled five days of shutdowns for the summer next week, and then added an additional two days in response to the global semiconductor shortage. The seven days were unrelated to the heatwave.

Samsung has also scaled back operations in response to the heatwave. Samsung said in a statement, “We are carefully monitoring the weather conditions and communicating with local authorities, and will adjust our plans accordingly.”

General motors noted it has not cut its production capacity at its Arlington plant, but it did lower its usage of air conditioning.

Tesla meanwhile urged all of its customers to not charge their vehicles during peak usage hours to avoid placing additional strain on the state power grid.

Meanwhile the semiconductor chip shortage continues to plague the car manufacturing industry. According to Angelo Zino, an equity analyst at CFRA, a New York-based investment research company, semiconductor companies such as OnSemi (ON), NXP Semiconductors (NXPI), and Microchip (MCHP) are all saying that microcontrollers and power management chips will be constrained in supply into the second half of the year.