Texas Winter Power Outage Plan: ERCOT vs. Local Grid Risks, Pipe Freeze Rules, and Backup Sizing

Since the catastrophic February 2021 freeze (Winter Storm Uri), Texas power plants and transmission facilities have undergone mandatory weatherization inspections under Senate Bill 3 and Public Utility Commission of Texas (PUCT) rules. During January 2026 Winter Storm Fern, ERCOT conducted roughly 2,500 facility inspections and maintained positive statewide generation reserves without issuing system-wide rotating blackouts.

Yet tens of thousands of Texas households still lost electricity during recent winter storms—including the February 2023 Austin/Central Texas ice storm and localized January 2026 freezing rain events—for 24 to 96 hours. Why? Because bulk power generation (ERCOT) is only half the equation. Freezing rain accretion (0.25 to 0.50 inches of radial ice) snaps live oak limbs across neighborhood distribution feeders operated by Oncor, CenterPoint, AEP Texas, Austin Energy, or CPS Energy. At the same time, Texas homes are engineered primarily to shed summer heat (IECC Climate Zones 2A and 3A), leaving water lines in unconditioned attics, exterior tankless water heaters, and pier-and-beam crawlspaces exposed to rapid freezing once the furnace stops running.

Step 1: Complete your Texas household winter needs sheet

Fill out these five household baselines before the first Arctic cold front drops temperatures below 28°F (-2°C):

• Electric Delivery Utility & Grid Interconnect: Record who maintains the physical poles and wires to your meter (your Transmission and Distribution Utility, or TDU, such as Oncor, CenterPoint, AEP Texas, or TNMP, or your municipal/co-op utility such as Austin Energy, CPS Energy, or PEC)—not just your retail billing company.
• Primary Heating Fuel & Aux Strip Lockout Risk: Check whether your home uses a natural gas / propane furnace (needs only 500–800 W of electricity to run the blower and igniter) or an all-electric heat pump with 5 kW to 15 kW auxiliary resistive heat strips (which draw 20 to 60 amps at 240V whenever outdoor temperatures drop below 30°F).
• Plumbing Architecture Vulnerability: Check all that apply to your home:
  • Pier-and-beam foundation with exposed supply lines under the subfloor
  • Slab-on-grade foundation with PEX/copper manifold routed through an uninsulated attic
  • Exterior wall-mounted tankless water heater (requires continuous 120V power to keep internal freeze-protection ceramic heaters active)
  • Backflow preventer / irrigation vacuum breaker standing above ground in the yard
• Medical & Vulnerable Occupant Margins: List any refrigerated medications, home oxygen concentrators, CPAP machines, infants under 12 months (who cannot use loose blankets), or older adults sensitive to indoor temperatures below 60°F.
• 72-Hour Potable Water Reserve: Store at least 1 gallon per person per day (minimum 3-day supply, ideally 5 days) in food-grade containers in case widespread neighborhood pipe bursts force your municipal water district to drop pressure and issue a boil-water notice.

Is the Texas power grid reliable in winter now?

Bulk generation reliability inside ERCOT is substantially stronger today than it was in 2021, thanks to mandatory generator weatherization standards, firm fuel supply service reserves, and utility-scale battery storage additions. In its post-event reporting after January 2026 Winter Storm Fern, ERCOT confirmed that inspected thermal and renewable units stayed online through sub-freezing conditions without requiring statewide load shedding.

However, statewide grid adequacy does not protect your house from a local distribution outage:

How do you know whether you are on the ERCOT grid?

Roughly 90% of Texas electric load operates inside the ERCOT power region, which covers Dallas–Fort Worth, Houston, Austin, San Antonio, Corpus Christi, the Rio Grande Valley, and most of West and Central Texas. However, according to the Public Utility Commission of Texas (PUCT), four major areas of Texas sit outside ERCOT on multistate interconnections:

How do you keep pipes from freezing in Texas?

Because northern states bury water mains below a 48-inch frost line and route indoor plumbing exclusively through heated basements, northern pipes rarely freeze during a brief 6-hour outage. In Texas, builders routinely run PEX and copper supply lines through vented, unconditioned attics, uninsulated garage walls, pier-and-beam crawlspaces, and outdoor tankless gas water heater cabinets.

As we proved in our pipe freeze temperature and time calculation, bare or lightly sleeved pipe in a vented Texas attic or crawlspace drops below 32°F within 3 to 6 hours once outdoor temperatures fall to 20°F (-6.7°C)—the exact hard-freeze threshold used by the National Weather Service across Central and North Texas.

Four Texas-specific plumbing rules before and during a hard freeze

1. Protect exterior tankless water heaters from power loss: Thousands of Texas homes built since 2010 have a gas tankless water heater recessed into an exterior brick wall. Although the burner uses natural gas, the internal ceramic anti-freeze heating blocks (100–200 W) require 120V electricity. If neighborhood power fails at 18°F, the copper heat exchanger inside that exterior box will freeze and split in under 3 hours—causing catastrophic interior flooding as soon as it thaws. Either plug the tankless unit into a pure sine wave LFP power station (300Wh–1,000Wh keeps the freeze heater alive for 6 to 15 hours) or shut off the isolation valves underneath the tankless unit and open its brass drain plugs immediately when power goes out.
2. Understand when dripping faucets works—and when to shut off and drain instead: As detailed in our physics analysis of dripping faucets, a pencil-lead trickle (0.05 to 0.10 GPM) prevents freezing during an overnight dip while your home still has heat. However, if your home loses power and indoor heat for more than 8 hours during a sub-20°F freeze, stop dripping, close your street-side or garage main water shutoff valve, and open the lowest indoor and outdoor faucets to drain the house plumbing lines.
3. Seal pier-and-beam crawlspace vents and wrap the riser: Before November, close or cover foundation vents with rigid XPS foam blocks (R-5 per inch) so Arctic north winds cannot blow under the subfloor, and sleeve the main vertical supply riser where it exits the ground with 1-inch elastomeric closed-cell pipe insulation.
4. Drain above-ground lawn irrigation backflow preventers: Turn off the dedicated irrigation isolation valve in the yard box, open both test cocks at a 45° angle, and turn the two ball-valve handles to a 45° half-open position so trapped water cannot split the bronze bell housing.

Sizing backup power for Texas heating systems (Gas Furnace vs. Heat Pump)

Before plugging in backup power, verify your heating equipment nameplate:

• Texas homes with a central natural gas or propane furnace: The gas burner provides all the thermal BTUs (60,000 to 100,000 BTU/hr), while the electrical circuit only drives the control board, draft inducer, and ECM/PSC blower motor (500 to 800 running watts, with a brief 1,200 to 1,800 W motor startup surge). A single 1,500Wh to 2,000Wh portable power station wired through a single-circuit furnace transfer switch—or a small 2,000W dual-fuel inverter generator—can heat the entire house and keep attic and wall pipes above freezing.
• Texas homes with an all-electric heat pump: Modern cold-climate heat pumps work efficiently down to 15°F, but builder-grade single-stage heat pumps common across Texas lose capacity below 32°F and energize auxiliary electric resistance heat strips (5 kW, 10 kW, or 15 kW). A 10 kW heat strip plus blower draws 10,500 W continuous—which will trip almost any portable generator or drain a whole-home battery in 1.2 hours. If running a heat pump on backup power during cold weather, configure your thermostat or air-handler breaker to lock out the electric resistance strips and shrink your heated footprint to a single insulated micro-shelter room.
• Never bring outdoor combustion inside: During the 2021 Texas freeze, carbon monoxide poisonings surged because families ran portable generators inside attached garages or used charcoal grills and camp stoves indoors. Keep every portable generator at least 20 feet outside away from doors, windows, and soffit vents, and review our indoor propane heater ODS sensor safety boundaries if using an ANSI Z21.103 portable propane heater with a window cracked for ventilation and working battery CO alarms.

Frequently asked questions

Is the Texas power grid reliable in winter now?

Bulk power generation on the ERCOT grid is much more resilient than it was in 2021 due to mandatory power-plant weatherization rules, ~2,500 annual facility inspections, and expanded battery and fuel reserves—as demonstrated when the statewide grid held without rolling blackouts during January 2026 Winter Storm Fern. However, local neighborhood outages lasting 24 to 96+ hours still happen regularly during Texas winter storms whenever freezing rain and ice accumulation snap tree limbs onto local distribution lines operated by Oncor, CenterPoint, AEP, Austin Energy, or rural electric cooperatives.

How do you keep pipes from freezing in Texas?

Before temperatures drop below 28°F (-2°C), wrap exterior hose bibs and above-ground irrigation backflow preventers, close pier-and-beam crawlspace vents, open kitchen and bathroom sink cabinet doors on exterior walls, and drip one cold/warm faucet at the farthest point from your water meter at a thin, steady trickle (0.05 GPM). If you lose electricity and indoor heat during a hard freeze (≤ 20°F), immediately drain any exterior wall-mounted tankless water heater (whose freeze heater stops working without 120V power), shut off your main water valve at the street or garage, and open your lowest faucets to drain the house lines before attic pipes freeze and burst.

How do you know whether you are on the ERCOT grid?

Check the Transmission and Distribution Utility (TDU) or municipal/cooperative name on your electric bill against the Public Utility Commission of Texas (PUCT) service area map. If your delivery utility is Oncor, CenterPoint Energy, AEP Texas, Texas-New Mexico Power (TNMP), Austin Energy, CPS Energy, Lubbock Power & Light, or Pedernales Electric Cooperative, you are on the ERCOT grid. If you are served by Entergy Texas (Southeast TX / Beaumont / The Woodlands), SWEPCO (Northeast TX / Texarkana / Longview), Xcel Energy (Amarillo / Panhandle), or El Paso Electric (Far West TX), your home sits on an interstate grid (MISO, SPP, or WECC) outside ERCOT.