Fuel resilience is the Houston question the freeze exposed
Most fuel write-ups treat the choice between a gas line and a propane tank as a matter of convenience or runtime. In Houston, Winter Storm Uri added a harder dimension that homeowners in milder markets never weigh: fuel resilience under a stressed grid and a stressed gas system at once. During Uri in February 2021, as ERCOT shed load statewide, natural gas supply itself faltered. Wellhead freeze-offs and processing losses pulled pressure down in parts of the distribution system exactly when demand for heat peaked, and some homes on the utility line saw pressure sag right when they needed their generator most. That is the lesson: the utility gas main is convenient, but it is not a sealed, independent supply. A standby generator draws its fuel from whatever infrastructure the storm is also attacking.
That reframes the decision. On a deregulated grid where the power side can go dark for days and the gas side can wobble too, an on-site propane tank is the one fuel source under your own control. It does not care what CenterPoint’s wires or the regional gas pressure are doing, and that independence is the real reason to weigh propane in Houston, over and above the classic runtime math. The natural gas vs. propane guide covers the fuels head to head; this page is about the setup work.
On-site propane, the fuel you fully control
An LP tank in the yard feeds the generator with a supply you own outright. It leans on neither the ERCOT grid nor a buried utility gas line that a storm or a freeze could disturb, which is why it earns a look here. In the outer counties it is often the only option anyway. Across rural Conroe and Montgomery County, the western edges of Fort Bend, and the outlying stretches near The Woodlands and Cypress, plenty of streets never got a gas main, so propane is simply how backup power gets fueled.
Runtime is a direct function of tank size, and the sizing choices matter:
- A larger tank buys days of unattended running. As a rough guide, a whole-home unit at partial load can run roughly a week or more on a 500-gallon tank, which is why that size shows up so often for full-home backup.
- Smaller tanks, say 100 or 250 gallons, cost less and take less yard space, but they need a refill sooner in a long outage.
- The right size depends on the generator’s output, how much of the house it carries, and how long your area’s outages run. The how long a standby generator will run guide walks through the tank math.
One caution the freeze and Beryl both drove home: after a major event, propane trucks cannot always reach everyone fast, because demand spikes and roads flood. The tank’s resilience only pays off if it is full when the event starts, so top it off ahead of a storm or a hard freeze, never after.
Natural gas, where the CenterPoint or Texas Gas Service main reaches you
Where a gas main runs down your street, natural gas is the lower-hassle path day to day: no tank to fill, and as long as the line holds pressure, no running dry. In Houston that mostly means CenterPoint Energy and Texas Gas Service territory, which blankets much of the urban core and inner suburbs and covers many established Harris County neighborhoods. Coverage is genuine inside the built-up metro but thins in outlying subdivisions. For a large share of city installs, this is what the property already has.
Tapping that line for a generator is more involved than it looks, and in Houston the sizing has to be done with real margin given what Uri revealed:
- Line sizing. A large standby unit is a heavy fuel consumer. A 22 kW generator at full tilt can call for roughly 280,000 to 350,000 BTU per hour, so the pipe has to carry that on top of the furnace, water heater, range, and everything else on the system.
- Meter and regulator capacity. A standard residential meter feeding existing appliances can be maxed out by adding a generator. CenterPoint or Texas Gas Service may have to upsize the meter or the regulator before the system runs reliably.
- Distance and pressure. A long run from the meter to the generator pad often needs a larger diameter, or the unit loses pressure and starves at the far end. That margin matters more when regional pressure can already sag in a freeze.
Because of all that, a natural gas hookup is a permitted job for a licensed pro, not a weekend project.
Placement, flood elevation, and the permit
Where a tank, a meter, and the generator may sit is shaped by local rules, and in flood-prone Houston that means elevation. Harvey submerged equipment across the metro in 2017, so gear and tanks often have to be raised above the base flood elevation, and tank placement carries its own setbacks. Gas and tank work is permitted and inspected, and requirements shift by county and city, so sizing, placement, and the permit get worked out for your specific address. County specifics live in the permitting by county guide.
How fuel ties into the rest of the system
Fuel never stands alone. It has to match the generator and the switch, so it is spec’d as part of a full generator installation alongside the automatic transfer switch. On propane especially, ongoing maintenance earns its keep, since a tank that quietly runs low or a regulator that drifts will leave you dark at the worst possible moment.
Get matched with a licensed installer
Share your city and whether you have a gas main at the street or would need a propane tank, and you will be matched with the one vetted, licensed local installer serving your area to size the fuel side correctly for your address. Start from the home page whenever you are ready.