Conroe Battery Backup Guide: Montgomery County Homes on the Entergy Grid
Conroe more than doubled its population between 2010 and 2024, growing from 56,207 residents to an estimated 114,581, and the Census Bureau once ranked it the fastest-growing large city in the United States (U.S. Census Bureau via Texas Real Estate Research Center, 2024). Tens of thousands of those new households learned something the hard way in July 2024: their power company is Entergy Texas, not CenterPoint. That distinction changed everything about how long the lights stayed off after Hurricane Beryl, and it changes how you plan backup power today. This guide walks through the exact steps, Entergy specifics included, from load list to installed battery system.
Key Takeaways
- Most of Conroe is served by Entergy Texas, whose transmission is coordinated through MISO, not ERCOT.
- Hurricane Beryl knocked out roughly 252,460 Entergy Texas customers at peak, including about 57,000 in the Conroe Network (Entergy Storm Center, 2024).
- Conroe, New Caney, and Cleveland were among the last areas restored, with work stretching to July 15-16, 2024.
- A 9 to 45 kWh battery system sized to your home keeps AC, refrigeration, and well pumps running through multi-day Entergy outages.
Who actually powers Conroe? Entergy Texas, not CenterPoint
Most of Conroe and much of Montgomery County sits inside Entergy Texas service territory, while CenterPoint serves the southern edge of the county around The Woodlands and Spring (Entergy Texas, 2026). Do not assume your utility from a zip code or from Houston news coverage. Check the logo on your electric bill. It determines which outage map you watch, which restoration crews you wait on, and which interconnection process your installer files.
Why does it matter so much? Entergy Texas is a vertically integrated utility whose transmission is coordinated through MISO, the Midcontinent Independent System Operator, rather than ERCOT. When statewide headlines talk about "the Texas grid," they usually mean ERCOT, and that news often does not describe what is happening on Conroe's wires. Entergy customers report outages through the Entergy Storm Center map, not CenterPoint's tracker.
MISO membership is not a shield, though. During the February 2021 winter storm, Entergy Texas ran periodic forced outages at MISO's direction while ERCOT ran its own rolling blackouts (Entergy Storm Center, 2021). Different grid operator, same cold house. Conroe homes went dark in 2021 and again in 2024.
Citation capsule: Most of Conroe, Texas is served by Entergy Texas, a vertically integrated utility whose transmission is coordinated through MISO rather than ERCOT. CenterPoint Energy serves southern Montgomery County near The Woodlands, which means Conroe homeowners follow a different outage map, a different restoration timeline, and a different interconnection process than most of metro Houston.
Our guide to hurricane prep for The Woodlands covers the CenterPoint side of that boundary. If your bill says Entergy, keep reading here.
How bad do Conroe outages get? Beryl and the 2024 storms
Hurricane Beryl made landfall on July 8, 2024 and knocked out roughly 252,460 Entergy Texas customers at its peak, including about 57,000 in the utility's Conroe Network (Entergy Texas storm update, July 9, 2024). Conroe, New Caney, and Cleveland were the hardest-hit areas in Entergy territory, and restoration in those pockets stretched all the way to July 15-16, roughly a full week without power in Texas summer heat.
The pattern repeats because of the terrain. Conroe sits in the Piney Woods, and tall loblolly pines falling across overhead distribution lines drove most of Entergy's restoration delays. Beryl was not even the first blow of that year: the May 2024 derecho tore through the region weeks earlier with straight-line winds that caused widespread damage across the greater Houston area. Two multi-day outage events in one summer is the recent Montgomery County baseline, not the worst case.
Citation capsule: Hurricane Beryl blacked out roughly 252,460 Entergy Texas customers on July 8, 2024. The Conroe Network alone had about 57,000 customers without power, and Conroe, New Caney, and Cleveland were among the last areas restored, with crews finishing July 15-16 according to Entergy Storm Center updates.
Would your household handle seven days without air conditioning in July? That is the planning question the rest of this guide answers.
Step 1: list the loads your home cannot lose
Start from circuits, not square footage. Walk your panel and write down what genuinely cannot go dark: air conditioning (the biggest single draw in a Conroe summer), refrigeration, a freezer full of food, medical equipment, internet and a home office, and the garage door. That list, not your home's size, sets the floor for your battery system.
Conroe has a split personality here, and it matters. The new master-planned sections, think Grand Central Park, Woodforest, and Ladera Creek style two-story homes, run on city water and sewer. But head north or west of town onto rural acreage and homes run on private wells and septic systems. No power means no water pressure and no aerator.
On installs across rural Montgomery County, the 240 V well pump is the load that changes the whole design. A typical 1 to 1.5 hp submersible pump surges hard on startup, so the inverter has to be sized for that surge on top of the AC compressor. I have seen homeowners buy small backup units that carry the fridge fine, then stall the moment the pressure tank calls for water. If you are on a well, say so in your first conversation with any installer. Our full breakdown of running a well pump on battery backup covers the surge math in detail.
Step 2: size for a 2,000 to 4,000 sqft Montgomery County home
Typical Conroe homes land between 18 and 36 kWh of storage. Eos systems scale in 9 kWh increments across five tiers: Essential at 9 kWh runs essentials up to 6 hours at minimal load, Plus at 18 kWh up to 12 hours, Pro at 27 kWh up to 18 hours, Premium at 36 kWh up to 24 hours, and Ultimate at 45 kWh up to 30 hours. Pair any tier with solar recharge and those windows repeat daily, which is how a battery outlasts a Beryl-length outage.
Here is how we map Conroe housing stock to tiers on real site surveys, assuming sensible load management (one AC zone at a time, staggered appliance use):
| Home profile | Typical Conroe example | Recommended tier |
|---|---|---|
| 2,000 sqft single-story | Starter homes in newer subdivisions | Plus (18 kWh) |
| 3,000 sqft two-story | Grand Central Park / Woodforest style builds | Pro (27 kWh) |
| 4,000+ sqft or lakefront | Lake Conroe area custom homes | Premium (36 kWh) |
| Any size on well and septic | Rural acreage north and west of town | Step up one tier, minimum Pro |
The well-pump rule in that last row is the one Conroe-specific adjustment most generic sizing guides miss. The pump's startup surge plus a 4 or 5 ton AC compressor is what pushes rural homes up a tier, independent of square footage.
Citation capsule: A typical 2,000 to 4,000 sqft Montgomery County home needs 18 to 36 kWh of battery storage for multi-day outage coverage. Eos sizing data maps 2,000 sqft homes to an 18 kWh Plus system, 3,000 sqft two-story builds to a 27 kWh Pro, and Lake Conroe area or well-pump properties to 36 kWh Premium or larger.
Step 3: Entergy interconnection and Montgomery County permits
If your battery system interconnects with the grid, especially paired with solar, the application goes to Entergy Texas, not CenterPoint, and the forms and review steps differ (Entergy Texas, 2026). A standalone backup battery still requires electrical permitting and inspection. This is the paperwork layer where a Conroe project diverges most from the Houston-guide advice you will find online.
Three layers apply, depending on your address:
- Utility: Entergy Texas interconnection review for grid-tied systems. Your installer files it; confirm they have done Entergy applications before, since many Houston-area crews only know CenterPoint's process.
- Permit authority: Inside Conroe city limits, the City of Conroe reviews the electrical permit. On unincorporated county land, Texas counties do not run full building-permit regimes the way cities do, but state electrical licensing rules still apply and requirements vary by address, so verify for your specific property.
- HOA: Master-planned communities like Woodforest and Grand Central Park run architectural review on visible exterior equipment. A garage-wall mount usually clears review faster than a street-visible placement.
A competent installer handles all three layers for you. If a contractor asks you to pull your own permit or file your own interconnection paperwork, treat it as a red flag and keep shopping.
Step 4: battery vs. generator for Piney Woods outages
After Beryl, the failure mode for generator owners was not the machine, it was the fuel. With power out across the region, stations in and around Conroe were dark or had lines stretching onto the feeder roads, and generator households were burning 15 to 20 gallons a day to keep AC running. A battery system recharges from solar every morning and needs no fuel logistics at all.
There is also a neighborhood-density angle that is new for Conroe. The city's growth means most new homes sit on compact lots in master-planned sections, where a portable generator running at 70 to 90 decibels a few feet from a neighbor's bedroom window creates real friction during a week-long outage. Batteries are silent, which matters more in 2026 Conroe than it did when most of the county was acreage. For rural properties, the strongest setup we install is hybrid: battery plus solar as the primary, with a small generator as a third layer for extended cloudy stretches.
Compare capacity, runtime, and what each tier backs up across all five system sizes before you talk to anyone.
What a Conroe install costs and how to get a fixed number
Cost depends on which tier fits your loads, your panel condition, and whether you add solar, so any single number you read online is a guess. Two moves get you to a real figure. First, read the full Texas battery backup cost breakdown to understand what drives pricing between tiers. Second, get an address-specific quote: a short qualification covering your square footage, AC tonnage, and well status produces a fixed price rather than a range.
Because Conroe sits on Entergy's grid, make sure any quote you accept comes from an installer who names Entergy Texas in the interconnection scope. A quote written for CenterPoint territory is a quote that will stall in paperwork.
Prefer to talk it through? Call the Eos team and mention your Entergy account, and we will walk your load list with you over the phone.
Frequently asked questions
Does Entergy Texas or CenterPoint serve Conroe?
Entergy Texas serves most of Conroe and central Montgomery County, while CenterPoint serves the southern part of the county around The Woodlands (Entergy Texas, 2026). Check the logo on your electric bill to confirm, because the boundary does not follow city limits or zip codes cleanly.
How long did Conroe go without power after Hurricane Beryl?
About 57,000 customers in Entergy's Conroe Network lost power when Beryl hit on July 8, 2024, and the hardest-hit areas around Conroe, New Caney, and Cleveland were not fully restored until July 15-16 (Entergy Storm Center, 2024). That is roughly a week in peak summer heat.
What size battery backup does a 3,000 sqft Conroe home need?
A 3,000 sqft two-story Conroe home typically fits the Pro tier at 27 kWh, which runs essentials up to 18 hours at minimal load and repeats daily with solar recharge. Homes on private wells usually step up one tier because the 240 V pump adds surge load and runtime demand.
Do I need a permit to install a home battery in Montgomery County?
Yes, electrical permitting applies everywhere. Inside Conroe city limits the city reviews the permit, while unincorporated county addresses follow state electrical licensing rules that vary by property. Grid-interconnected systems also file an application with Entergy Texas. A qualified installer handles all of this paperwork for you.
Is Conroe on ERCOT?
Mostly no. Entergy Texas transmission is coordinated through MISO, so Conroe sits largely outside ERCOT's footprint. That did not prevent outages: Entergy ran MISO-directed forced outages during the February 2021 winter storm and lost roughly 252,460 customers to Beryl in 2024 (Entergy Storm Center, 2024).
Can a battery run a well pump during an outage?
Yes, when the inverter is sized for the pump's startup surge. A typical 1 to 1.5 hp submersible well pump surges to two or three times its running draw at startup, so rural Montgomery County systems are specified around that peak. See the well pump section above for the surge math.
The fastest-growing city in America should not wait a week for power
The playbook is four steps: confirm you are on Entergy and watch the right outage map, list the loads you cannot lose (well pump included), size into the 18 to 36 kWh range that fits Conroe housing stock, and let your installer run Entergy interconnection plus city or county permitting. Beryl proved the Conroe Network can sit near the back of a week-long restoration queue, and the 2024 derecho proved hurricanes are not the only trigger. A city that doubled its population in fourteen years is still hanging its summers on overhead lines through the pines. Your house does not have to.
Sources: Entergy Storm Center storm updates (entergy.com/stormcenter, July 2024 and February 2021, retrieved 2026-07-14); Entergy Texas service territory (entergy-texas.com, retrieved 2026-07-14); U.S. Census Bureau population estimates via Texas Real Estate Research Center (trerc.tamu.edu, retrieved 2026-07-14); City of Conroe (cityofconroe.org, retrieved 2026-07-14).