Two things changed this year that matter more to a solar owner than to a solar shopper. The federal tax credit for buying a residential system ended December 31, 2025. And ERCOT's own winter reliability numbers show the grid's cushion for a genuinely cold snap has shrunk by nearly half since 2021.

Neither of those is a reason to worry about the system you already have. Both are reasons to make sure it's actually working before winter finds out for you.

The 30% Credit Is Gone. That Changes Replacing, Not Fixing.

The One Big Beautiful Bill, signed July 2025, ended the Section 25D residential solar tax credit on December 31, 2025. If you buy or finance a new residential system in 2026, the federal credit is $0. There's a narrower business-claimed credit (48E) that still applies to leased or PPA systems through 2027, but that doesn't help anyone who already owns their system outright.

Here's the part that actually affects our customers: a repair was never a tax-advantaged purchase either way, so this change doesn't touch what a repair costs you. What it does change is the math on the other option. Ripping out an aging system and starting over used to come with a 30% federal discount. Now it doesn't. That gap didn't make repair cheaper. It made replacement meaningfully more expensive, which means the system currently on your roof is worth more to keep running than it was a year ago.

ERCOT's Winter Cushion Is About Half What It Was

Since 2021, Texas added roughly 31 gigawatts of solar, 17 gigawatts of battery storage, and 11 gigawatts of wind to the grid. It added about 3 gigawatts of new gas. NERC's most recent reliability assessment puts the winter reserve margin at around 10%, down from 17.5% in 2021, and flags elevated risk continuing through 2027. In plain terms: in a below-normal cold snap, the region's own reliability analysts say a supply shortfall is a real possibility, not a hypothetical one.

Texas added 31 gigawatts of solar and 17 gigawatts of battery storage since 2021. It added 3 gigawatts of gas. The grid is leaning harder on exactly the equipment sitting on your roof and in your garage, and it has less room for any of it to be down.

Batteries Aren't a Luxury Item on This Grid Anymore

Texas entered 2026 with roughly 14 gigawatts of operational battery storage, nearly double the 7.8 gigawatts it had at the start of 2025, and enough to have passed California. That's not an abstraction. Every one of those batteries is a small piece of the state's winter and evening reliability plan now, the same way we wrote about the grid's new 9 p.m. risk window back in July.

A battery that isn't actually configured right, or an array feeding it that's underproducing, isn't just a smaller bill for you. It's one fewer working unit on a grid that's counting on all of them. We still see this most often as a communication fault or a misconfigured schedule, not a dead battery, which is good news: it's usually fixable in an afternoon once someone's actually looking at the data.

What This Actually Asks of You Before Winter

Central and South Texas winters are usually mild. "Usually" is doing real work in that sentence, and February 2021 is the reason it has to. Nobody needs a repeat of Uri to take a below-normal cold snap seriously, and this year's own reliability numbers say the margin for one going wrong is thinner than it's been in years, not thicker.

So before the first real cold front: open your monitoring app and check for gaps, not just totals. A panel or gateway that quietly stopped reporting in a warm month doesn't announce itself, it just goes quiet, and quiet is easy to miss until a cold week makes every kilowatt-hour matter. If your system came from an installer who's gone, or you've never actually confirmed it's reporting correctly, this is the season that tends to find that out the hard way.

The Year Ahead

Expect the tax-credit gap to keep pushing more homeowners toward keeping and maintaining what they have rather than replacing it, expect ERCOT's margin conversation to stay tight through 2027, and expect utility and retail programs paying homeowners for battery participation to keep expanding as the grid leans harder on distributed storage. None of that requires you to do anything today except the one thing that's always been true: know what your system is actually telling you.

Sources
NERC: 2025-2026 Winter Reliability Assessment, Texas Public Policy Foundation: ERCOT winter reliability, Modo Energy: ERCOT battery buildout, 14 GW entering 2026, Solar.com: the fate of the 30% federal solar tax credit