Every Texan I know has what you might call “grid anxiety,” a low-humming preoccupation with electricity that emerged after brutal winter storms kneecapped the state’s isolated power grid in February 2021. That frigid disaster triggered highway pileups and runs on grocery stores; people inadvertently poisoned themselves with carbon monoxide by running grills and cars indoors to keep warm. My hometown of San Antonio, like so many places across the state, simply wasn’t equipped to deal with several days of freezing temperatures. Many factors contribute to a disaster of this magnitude, but the fundamental failure of the state’s energy infrastructure can’t be overemphasized. Extreme cold is one end of the spectrum. Texas reached the other this summer, as record-breaking heat enveloped the South. Now my conversations with folks back home inevitably lead me to ask, “Is your grid up for this?” So far, the answer has been yes, thanks in part to a substantial expansion of renewable energy, particularly solar power, in the state. But energy is not straightforward: Additional solar capacity will get us only …