Temperatures will plummet to the teens on Wednesday across North Texas. The front is the season's coldest so far.

On sunny days in the Hill Country, Tom Cook taps open an app on his phone and watches the power generated from the solar panels on his roof flow to his home — and out to the state power grid.

The aggregated distributed energy resource pilot currently provides about 25.5 MW of energy and almost 20 MW of other reserve services to the Electric Reliability Council of Texas market.