(AP) The operator of the electric grid that serves most of Texas has declared an energy conservation emergency as temperatures across much of the state approached or exceeded 100 degrees (38 Celsius).

The Energy Reliability Council of Texas appealed to all of the state's consumers of electric power to limit and reduce their usage during the peak demand hours of 3 to 7 p.m. Tuesday after reserve capacity fell below 2,300 megawatts.

No rotating power outages were immediately reported.

ERCOT suggests setting thermostats 2 to 3 degrees higher, set pool pumps to shut off from 4 to 6 p.m., turn off and unplug nonessential lights and appliances, and avoid using large appliances such as ovens and washing machines during peak hours.

A megawatt is about enough electricity to power roughly 200 homes running air conditioners during hot weather.