Texas-New Mexico Power · Texas TDU

TNMP: service area, rates, and how it works

Texas-New Mexico Power (TNMP) owns the poles, wires, and meter in its patchwork of Texas service areas and delivers your power. It doesn't sell electricity — you choose the retail provider. Here's what TNMP does, what it charges, and how to tell if you're on it.

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Researched and written by the Base Power team · Last updated May 27, 2026

How we source this: delivery charges are taken from the utility's PUCT-approved tariff and the PUCT monthly rate reports, and verified against the published bill examples. Rates reset on a schedule — we link the sources so you can check the current numbers.

The short version

Texas-New Mexico Power (TNMP) is the wires company for four separated pockets of Texas — the Gulf Coast south of Houston (Texas City, League City, Friendswood), the Lewisville/north Dallas area, central Texas, and the Fort Stockton/Pecos area in West Texas — more than 280,000 metered customers in all. TNMP doesn't sell electricity and you can't choose it; it's set by your address. Its PUCT-regulated delivery rate (about 6.47¢/kWh plus $7.85/month as of April 2026) is typically the highest among the major Texas TDUs because it's spread over fewer meters and longer rural lines. You choose your retail provider — like Base — which sets the energy rate and sends your bill.

Wires vs. retail

How TNMP works

In TNMP territory two different companies handle your electricity. TNMP is the TDU (transmission & distribution utility): it owns and maintains the poles, wires, transformers and your electric meter, physically delivers the power, reads the meter, and restores service after an outage. TNMP does not sell you electricity and you cannot switch away from it — everyone at your address is delivered by TNMP.

Separately, you choose a retail electric provider (REP) — the company you sign up with and pay. The REP buys the energy, sets your energy price, and sends your bill. On that bill TNMP's regulated delivery charges are passed through. A transparent REP passes TNMP's delivery charges through at cost with no markup; the only part a REP competes on is the energy charge and any membership fee. Base Power Company (Base Texas REP, LLC; PUCT #10338) is one such REP — a flat energy rate from 8¢/kWh plus TNMP's pass-through delivery, with no markup on delivery.

Parent company

TXNM Energy (formerly PNM Resources)

Headquarters

Lewisville, Texas

Delivers to

280,000+ customers

Service area

4 Texas regions

History: TNMP traces to the early 20th-century Texas-New Mexico Power Company. After a 2000 leveraged buyout it was acquired by PNM Resources in 2005; it later transferred its New Mexico distribution properties and today operates solely as a Texas transmission and distribution utility, headquartered in Lewisville. In 2024 parent PNM Resources renamed itself TXNM Energy, and in 2025 agreed to be acquired by Blackstone Infrastructure (Texas regulators approved the deal in February 2026).

PUCT-regulated delivery

TNMP delivery charges

TNMP's delivery charges are higher than Oncor's or CenterPoint's because TNMP serves a relatively small customer base spread across four separated, partly rural pockets — the fixed cost of its poles and wires is spread over fewer meters and longer line miles. These charges are identical no matter which retail provider you choose, because they go to TNMP, not your REP.

Volumetric charge

6.4665¢

per kWh delivered

Fixed monthly

$7.85

$1.13 customer + $6.72 metering

At 1,000 kWh

$72.52

estimated monthly delivery, before your energy rate

This is a DECREASE from the prior period — from September 2025 through February 2026 TNMP's volumetric rate was about 7.24¢/kWh, so many comparison charts still show the older, higher figure. A separate TNMP base-rate case (PUCT Docket 58964) is pending in mid-2026 and may move the rate again.

Effective April 11, 2026; verified against the PUCT rate report on May 27, 2026. TDU rates reset periodically — your plan's Electricity Facts Label shows the exact current figure.

Where it delivers

TNMP service area

TNMP operates in four separated pockets of the ERCOT grid: (1) Southeast/Gulf Coast Texas (Texas City, League City, Friendswood, Pearland, Angleton); (2) North Texas (the Lewisville/Coppell area and points north); (3) Central Texas (the Glen Rose/Gatesville area); and (4) West Texas (Fort Stockton, Pecos, Kermit). Because the territory is non-contiguous, your city name isn't a reliable guide — neighboring streets can be on different utilities.

Texas cities Base serves in TNMP territory

Larger cities in TNMP territory

  • Texas City
  • League City
  • Friendswood
  • Dickinson
  • Pearland
  • Angleton
  • La Marque
  • Lewisville
  • Coppell
  • Glen Rose
  • Gatesville
  • Fort Stockton
  • Pecos
  • Kermit

Service areas are set by your address, not your city name — neighboring streets can be on different utilities. Your ESI ID is the reliable test (see below).

Storms & restoration

Reliability and outages

Like all Texas TDUs, TNMP is responsible for local grid reliability and outage restoration; the PUCT and ERCOT oversee reliability standards. TNMP's Gulf Coast pocket is hurricane-exposed and its West Texas pocket covers sparse, long rural lines, which shape its reliability profile. TNMP doesn't publish consumer-facing reliability indices, so we don't assert specific figures here.

If your power is out

Call TNMP, not your retail provider — TNMP owns and restores the physical grid. Report outages at 1-888-866-7456 (24/7) or via the map at tnmp.com/power-outage-map; enrolled customers can also text OUT to 30184. Your retail provider (such as Base) handles billing and your plan but has no crews and can't restore power. A home battery installed by a provider like Base can keep your own home powered during a TNMP outage, but it doesn't affect the broader grid.

TNMP outage map → Call 888-866-7456

Your meter ID

Finding your ESI ID in TNMP territory

The reliable test for whether you're on TNMP is your ESI ID (Electric Service Identifier) — the unique number for your meter. TNMP ESI IDs are 17 digits and begin with 1040051. Because TNMP's territory is non-contiguous, your city name isn't a guarantee — for example, much of League City is TNMP while nearby areas are CenterPoint, and parts of Lewisville/Coppell are TNMP while surrounding suburbs are Oncor. You can look up your ESI ID by address through a provider's enrollment flow or PowerToChoose.org.

Look up your address

Enter your address and we'll match it to your meter and your local utility, then show your Base rate. (Exact pricing always lives on the Electricity Facts Label.)

TNMP FAQs

As of April 2026, TNMP's residential delivery charge is a fixed $7.85 per month plus about 6.47¢ per kWh — roughly $72.52 of delivery on a 1,000 kWh bill. This volumetric rate dropped at the 2026 reset from the ~7.24¢/kWh in effect from September 2025, so many comparison charts still show the older, higher figure. TNMP delivery rates reset periodically, so re-check at each reset. These charges are identical no matter which retail provider you choose, because they go to TNMP, not your REP.
No — TNMP is your delivery utility (the poles, wires and meter), not your retail seller of electricity, and you can't switch away from it. Every home and business in TNMP's territory is delivered by TNMP regardless of which company they buy power from. What you can choose is your retail electric provider (REP), the company that sets your energy price and sends your bill. Switching REPs (for example, to Base) never changes who maintains your lines or restores your power — that's always TNMP.
TNMP serves a relatively small customer base spread across four separated, partly rural pockets of Texas, so the fixed cost of maintaining its poles and wires is spread over fewer meters and longer line miles. That structurally pushes its per-kWh delivery rate and its $7.85 monthly charge above the larger, denser utilities. Even after its 2026 decrease, TNMP's delivery cost at 1,000 kWh (~$72) is typically the highest among the major Texas TDUs, versus roughly $56–65 for CenterPoint and Oncor.
The reliable test is your ESI ID (Electric Service Identifier), the unique number for your meter. TNMP ESI IDs are 17 digits and begin with 1040051. Because TNMP's territory is non-contiguous, your city name isn't a guarantee — much of League City is TNMP while nearby areas are CenterPoint, and parts of the Lewisville/Coppell area are TNMP while surrounding suburbs are Oncor. You can look up your ESI ID by address through a provider's enrollment flow or PowerToChoose.org.
Call TNMP, not your retail provider. TNMP owns and restores the physical grid, so report outages to TNMP at 1-888-866-7456 (24/7) or check the live map at tnmp.com/power-outage-map; enrolled customers can also text OUT to 30184. Your retail provider (such as Base) handles billing and your plan but has no crews and can't restore power. Separately, a home battery installed by a provider like Base can keep your own home powered during a TNMP outage, but it doesn't affect the broader grid or TNMP's restoration.

Other Texas utilities

Shopping by city instead? See electricity rates by city or how to choose a provider.

You can obtain important standardized information that will allow you to compare this product with other offers. Contact Base Power at 512-518-1009 or basepowercompany.com.

TNMP delivers it — Base prices it

Same TNMP wires, same regulated delivery charges, passed through with no markup — plus a flat 8¢/kWh energy rate and a flat $19–$29/mo membership. No teaser pricing or bill-credit games.

Takes about two minutes.

Sources

Plan documents: Electricity Facts Label (EFL) · Terms of Service & Your Rights as a Customer. Products and pricing are offered to qualified customers in Texas only.

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