A summer of brutal heat has strained the Texas grid. Even as the hot weather subsides, operators are already getting ready for a unique challenge.

Texas is facing its biggest test of the summer this week to keep the power on — and air conditioners running — as temperatures hit triple digits and push electricity consumption to all-time highs.

Hot, humid weather put the squeeze on the grid, but another challenge looms next month: a solar eclipse that could slash renewables output and create an unprecedented test for the embattled grid.