Porter and New Caney Battery Backup: East Montgomery County's Long Restorations

Two houses in Porter can sit four miles apart and get completely different answers about how long the power stays off. One is on a 2023 feeder built for a new subdivision off the Grand Parkway. The other is on a rural line that has been feeding acreage lots since before the Grand Parkway existed. Same ZIP code, same storm, very different restoration.

That split is the real story of battery backup in east Montgomery County, and it is not the same story as Conroe or Magnolia. Here is how to figure out which side of it you're on.

Key Takeaways

• Five electric utilities reported service territory in Montgomery County in 2024, so your restoration outlook depends on which one holds your address (U.S. EIA, Form EIA-861).
• Montgomery County added 129,046 residents between April 2020 and July 2024, a 20.8% jump (U.S. Census Bureau, Vintage 2024 estimates).
• The East Fork of the San Jacinto at New Caney crested five separate times above minor flood stage during 2024 alone (NOAA National Water Prediction Service).

Which utility actually serves your Porter or New Caney address?

Five utilities reported electric service territory in Montgomery County, Texas for 2024: CenterPoint Energy, Entergy Texas, Sam Houston Electric Cooperative, Mid-South Electric Cooperative and San Bernard Electric Cooperative (U.S. Energy Information Administration, Form EIA-861 Service Territory file, 2024). In the Porter and New Caney corridor, the three you're likely to run into are Entergy Texas, CenterPoint and Sam Houston Electric Cooperative.

Entergy Texas confirms Montgomery County is one of the 27 counties it serves, across roughly 15,320 square miles and 538,000 customers as of December 31, 2025 (Entergy Texas, About us). Sam Houston Electric Cooperative, based in Livingston, also holds territory inside the county. CenterPoint covers the south and southwest edges nearest Harris County.

So how do you find out which one is yours? Look at the delivery portion of your bill, not the retailer's logo. If you're a cooperative member, you won't have a separate retail provider at all, and that alone tells you where you sit.

Why this matters for a battery: the interconnection paperwork, the timeline and the technical requirements come from that utility, not from the state. Two neighbors on different systems can face different application forms for the same equipment.

Why the "how long will I be out" answer splits along US 59

In 2024, average outage duration per customer ran from about 29 hours to about 76 hours depending on which of these utilities served the meter. Entergy Texas reported a system average interruption duration index (SAIDI) of 1,727.5 minutes for the year including major event days. CenterPoint reported 4,315.8 minutes. Sam Houston Electric Cooperative reported 4,584 minutes (U.S. EIA, Form EIA-861 Reliability file, 2024). The Texas statewide figure was 1,614.3 minutes.

Strip out the major storm days and the ordinary-year picture separates too. CenterPoint averaged 150.1 minutes per customer, Entergy Texas 304.8 minutes, and Sam Houston Electric Cooperative 378 minutes.

What we take from this: these are system-wide averages, not Porter-specific numbers, and no utility publishes a feeder-level breakdown for these ZIP codes. But the spread is the point. A cooperative member in east Montgomery County averaged more than two and a half times the everyday outage minutes of a CenterPoint customer in the same county, before a single hurricane was counted.

The growth corridor explains a good part of it. Montgomery County's population reached 749,613 by July 1, 2024, up 129,046 from the April 2020 census base, a 20.8% increase in a little over four years (U.S. Census Bureau, Vintage 2024 County Population Estimates). The county added 34,268 people in the 2023 to 2024 year alone. Greater East Montgomery County now describes itself as a market of nearly a quarter-million people (Greater East Montgomery County Chamber).

New rooftops arrive on new distribution. The rural lines beside them did not get replaced, they got neighbors.

What the East Fork of the San Jacinto adds to the problem

The East Fork of the San Jacinto River at New Caney crested at 81.15 feet during Hurricane Harvey on August 29, 2017, carrying a peak discharge of 120,000 cubic feet per second (USGS, peak streamflow for station 08070200). Major flood stage at that gauge is 69 feet (NOAA National Water Prediction Service, gauge NCET2). Harvey cleared it by more than twelve feet.

Harvey is the headline, but it is not the pattern. The second-highest crest on record at that gauge is recent: 77.70 feet on May 3, 2024.

Our count from the NOAA crest history: during calendar year 2024, the East Fork at New Caney crested above the 58-foot minor flood stage five separate times, on May 3, May 15, May 19, July 12 and July 26. Three of those crests topped 67 feet.

Caney Creek and the East Fork drain into the upper end of the same basin that fills Lake Houston, and the San Jacinto River Authority's jurisdiction covers the entire watershed outside Harris County, including all of Montgomery County (San Jacinto River Authority). Porter and New Caney sit upstream. Water that rises here shows up downstream later, which is why the equipment-elevation playbook we wrote for the Lake Houston side applies here in a modified form.

Practical version for east Montgomery: keep the battery, controller and disconnect off the slab, put them on an interior garage wall or an elevated exterior pad, and get the flood zone pulled for the parcel before design, not after.

Sizing for the east Montgomery housing mix

The housing stock out here is genuinely mixed, and that changes the load list more than square footage does. Newer subdivisions off FM 1314 and the Grand Parkway run all-electric with two air conditioning systems. Older acreage lots run a private well, an aerobic septic system, and sometimes a shop.

One honest note. A reliable, publicly citable manufactured-home share for the Porter and New Caney ZIP codes is not published in a form we can point you to, so we're not going to put a number on it. What we can tell you is that manufactured homes and acreage parcels are common enough here that a backup design built for a Woodlands floor plan will miss.

Three loads change the math on a rural east Montgomery lot:

• Well pump. A submersible pump draws hard on start. Eos controllers deliver 11.5 kW continuous and 17.1 kW surge, which covers typical residential pump inrush, but the pump has to be inside the backed-up panel to matter.
• Aerobic septic aerator. Small continuous draw, easy to forget, and Montgomery County Environmental Health permits these systems at the county level (Montgomery County Environmental Health).
• Second air conditioning system. Two-story homes on the new feeders usually have two. Backing up both, or choosing one, is a design decision, not a default.

For homes that want a full day of coverage with well and septic included, the two-battery configuration is usually the starting point.

Prefer to read the tier detail first?

Interconnection and permits: what changes out here

Permitting in unincorporated east Montgomery County runs through the county rather than a city building department, and septic falls under Montgomery County Environmental Health's on-site sewage facility program (Montgomery County Environmental Health). Porter and New Caney are both unincorporated, so there is no city permit office to add a second review layer.

The interconnection side is where the utility split bites. An Entergy Texas customer, a CenterPoint customer and a Sam Houston Electric Cooperative member each file with a different organization, on different forms, with different review windows. Cooperatives set their own member policies rather than following an investor-owned utility's tariff.

A battery that never exports to the grid is a simpler conversation than a solar-plus-storage system that does. That distinction is worth raising in your first call, because it often decides how long the paperwork takes.

If your address sits closer to the county seat, the

covers the Entergy side in more depth. On the rural west side, the covers wells, septic and multi-day recharge.

What to do before the next storm season

Start with three answers, in this order. Which utility holds your meter. What your flood zone says. Which loads you refuse to lose.

Those three decide the system, and none of them require a site visit to begin. Everything after that is sizing and scheduling.

We cover Porter and New Caney out of the same Houston metro service footprint that reaches Kingwood and Conroe.

and . For north county addresses, the has the local detail.

Or call Eos at 833-989-3737 to talk through your setup with an installer.

Frequently asked questions

Which electric utility serves Porter and New Caney, TX?

It depends on the specific address. Five utilities reported service territory in Montgomery County for 2024, including Entergy Texas, CenterPoint Energy and Sam Houston Electric Cooperative (U.S. EIA, Form EIA-861). Check the delivery section of your electric bill to confirm which one holds your meter.

How long do power outages last in east Montgomery County?

In 2024, average annual outage duration per customer ranged from 1,727.5 minutes for Entergy Texas to 4,584 minutes for Sam Houston Electric Cooperative, including major storm days (U.S. EIA, Form EIA-861 Reliability). These are system-wide averages, not Porter-specific figures.

How high did the San Jacinto River get at New Caney during Harvey?

The East Fork of the San Jacinto at New Caney crested at 81.15 feet on August 29, 2017, with a peak discharge of 120,000 cubic feet per second (USGS station 08070200). Major flood stage there is 69 feet, so Harvey exceeded it by more than twelve feet.

Can a home battery run a well pump and an aerobic septic system?

Yes, when both are wired into the backed-up panel. Eos controllers deliver 11.5 kW continuous and 17.1 kW surge, which handles typical residential submersible pump inrush. The aerator is a small continuous draw that mostly affects how long the battery lasts, not whether it starts.

Do I need a city permit for a battery install in Porter or New Caney?

Both communities are unincorporated, so permitting runs through Montgomery County rather than a city department, and septic systems fall under the county's on-site sewage facility program (Montgomery County Environmental Health).

The bottom line for Porter and New Caney

The east side of Montgomery County is not one market. It is a new-construction corridor sitting on top of a rural distribution system, with a river that has crested above major flood stage twice in the last decade. Which of those two realities you live in changes the design.

Find out which utility holds your meter, pull your flood zone, and write down the loads you cannot lose. Then the sizing conversation takes about ten minutes.