Gotta love this letter to the editor by engineer Wendell Peters published today in the San Antonio Express-News:

After an explosion at one of our power plants, CPS Energy urged us to conserve power. I was curious to see how much power is used by the digital billboards gracing our highways. The CPS meter is at the base of the sign, so anyone can read it. …

Peters found the controversial billboards set up by Clear Channel Communications suck up enough juice to power scores of homes.

Related: How to contact a San Antonio reporter

You can agree or disagree with his proposal to turn off the billboards. But I liked how Peters’ curiosity and ingenuity led him to new information. That’s journalism at its best.