(KTEN) — The Electric Reliability Council of Texas asked Texans to voluntarily limit the use of power between 4 and 8 p.m. Tuesday "due to forecasted extreme temperatures, forecasted record demand, and lower reserves."

ERCOT manages most of the state's electrical grid.

"I want to be clear: ERCOT is not experiencing any emergency conditions right now," said ERCOT executive Paplo Vegas. "Voluntary conservation is a very widely used industry tool that can help lower demand for specific periods of time."

As of late Tuesday morning, 49 percent of the power on the grid was being generated by natural gas; more than 30 percent is from renewable solar, wind and hydroelectric sources; and the rest is a mix of coal and nuclear power.

Texas set a state record for energy demand in June on Monday; at the peak, the grid was supplying just over 79,000 megawatts.