Lewisville · Oncor + TNMP (check your address)

Electricity rates in Lewisville, TX

Lewisville is unusual: it's split between two delivery utilities, Oncor and TNMP, sometimes street by street. Both are deregulated — so you can still choose your provider.

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Written and reviewed by the Base Power team · Last updated May 27, 2026

Quick answer

Lewisville is a rare patchwork: depending on your exact address, your wires utility is either Oncor or Texas-New Mexico Power (TNMP), which is headquartered in Lewisville. Both are deregulated, so you have retail choice either way — only the delivery charges differ. Base charges a flat 8¢/kWh energy rate plus your TDU's pass-through delivery and a flat monthly membership.

Today's rates

Lewisville rate snapshot

Your bill has two parts: the energy you buy from a retail provider, and delivery charges set by Oncor Electric Delivery or Texas-New Mexico Power (TNMP) and passed through without markup. Here's how that looks today.

Base energy charge

8¢ /kWh

Advertised flat rate, plus a flat $19–$29/mo membership.

Oncor delivery

5.6¢ /kWh

+ $4.23/mo, PUCT-approved (March 1, 2026). Same for every provider.

Texas average rate

16.39¢ /kWh

Below the U.S. average of 18.83¢/kWh (EIA, 2026).

Typical Texas bill

$164 /mo

At ~1,096 kWh/mo (EIA). Lewisville summers run higher.

Rates and figures last reviewed May 27, 2026. Base's energy charge is its advertised rate; exact, usage-based pricing is in the Electricity Facts Label. See your exact rate →

The real question

What should you pay in Lewisville?

There's no single "right" number — it depends on your home, your usage, and your plan. But a lot of Texans pay more than they expect, and it's usually not the headline rate's fault. Many plans advertise a low rate that only applies inside a narrow usage band, or hand back a "bill credit" only if you land on exactly the right kilowatt-hours. Miss the threshold and the effective rate jumps.

The honest way to know what you should pay is to compare the all-in cost — energy plus Oncor or TNMP delivery plus any fees — at your actual usage. Base removes the guesswork: one flat 8¢/kWh energy charge and a flat monthly membership, with no teaser rates and no bill-credit games.

The wires

Who delivers your power in Lewisville?

Oncor is the largest transmission and distribution utility in Texas. It owns and maintains the poles, wires, and meter across the Dallas–Fort Worth area. Oncor doesn't sell electricity and you don't choose it — it's set by your address, and it handles outages and restoration regardless of which retail provider you pick.

Texas-New Mexico Power (TNMP) — headquartered in Lewisville — owns and maintains the poles, wires, and meter in its patchwork of North Texas and Gulf Coast service areas. TNMP doesn't sell electricity and you don't choose it — it's set by your address, and it handles outages no matter which retail provider you pick.

Lewisville city limitsDeregulatedDelivered by Oncor or TNMP

Oncor Electric Delivery

Serves the Dallas–Fort Worth Metroplex and much of North and West Texas.

Report an outage: Oncor outage map · 888-313-4747
Finding your ESID: Oncor ESIDs are typically 17-digit numbers that begin with 1044372.

Texas-New Mexico Power (TNMP)

Serves scattered areas of North Texas and the Gulf Coast.

Report an outage: TNMP outage map · 888-866-7456
Finding your ESID: TNMP ESIIDs are long numeric IDs you can confirm on your meter or bill.

Local context

How electricity rates work in Lewisville

Lewisville's quirk is its utilities: it's a mixed TDU city where one side of a street can be served by Oncor and the other by Texas-New Mexico Power (TNMP). Fittingly, TNMP is headquartered right in Lewisville. Both utilities operate in deregulated territory, so retail choice exists across the city — only the delivery-charge math changes.

Beyond the utility patchwork, Lewisville is a growing Denton County city of about 136,000 anchored by Lake Lewisville, the largest reservoir in DFW, and a revitalized Old Town entertainment district that's adding new housing. The new residential construction is a natural fit for solar and battery.

Why are Lewisville bills highest in summer?

Lewisville is in Denton County under the North Texas heat — about 20 days a year over 100°F on average — so summer air conditioning is the main driver of electricity bills, the same as the rest of the DFW area regardless of which delivery utility serves your street.

Lewisville, the grid, and backup power

Whether you're on Oncor or TNMP, Lewisville sits on the ERCOT grid that nearly collapsed during Winter Storm Uri in February 2021. A home battery is a separate product that backs up your own home during an outage; it doesn't change which utility maintains your wires or how fast power is restored.

Apples to apples

How Base compares in Lewisville

Every retail provider in Oncor or TNMP territory passes through the same regulated delivery charges. The difference is how they price energy — and whether the rate you see is the rate you get.

	Flat & clear	Typical fixed-rate planMost REP offers	Bill-credit / tiered plan“Teaser” pricing
Energy charge	Flat 8¢/kWh	Fixed ¢/kWh	Low only in a usage band
Monthly charges	Flat $19–$29 membership	Base / min-usage fees	Bill credits at set usage
Same effective rate at any usage	yes	yes	no
No usage-threshold surprises	yes	yes	no
Delivery charges passed through with no markup	yes	yes	yes
Optional whole-home battery backup	yes	no	no
Bottom line	Your exact cost depends on your usage — always compare the EFL before you sign up.

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.

Three steps

How to find your best rate in Lewisville

1
Confirm your utility is Oncor or TNMP

In Lewisville, Oncor delivers your power. That sets your delivery charges, but you still choose your retail provider.
2
Find your ESID

Your ESID (Electric Service Identifier) is the unique ID for your meter — it's on your current electric bill. Oncor ESIDs are typically 17-digit numbers that begin with 1044372. It tells any provider exactly which home and rate apply.
3
Compare the all-in cost on the EFL

Pull the Electricity Facts Label and compare offers at your real usage — or just enter your address to see your exact Base rate.

Pull the Base EFL, compare offers on Power to Choose, or enter your address to see your exact Base rate.

Lewisville electricity FAQs

It depends on your exact address — Lewisville's service map is a patchwork, sometimes splitting street by street between Oncor and Texas-New Mexico Power (TNMP). Check your current bill or do an address/ESID lookup. Both are deregulated, so you can choose your retail provider either way; only the delivery charges differ.

For your ability to shop, no — both are deregulated, so you choose your retail provider in either case. What changes is the delivery (TDU) charge portion of your bill, since Oncor and TNMP set different PUCT-approved rates. Your provider passes those through without markup.

Texas-New Mexico Power is headquartered in Lewisville and serves part of the city, while Oncor serves the rest. That's why Lewisville is one of the few DFW cities where your delivery utility genuinely depends on your address.

Base charges the same flat energy rate (advertised at 8¢/kWh) plus a flat monthly membership in either territory; the delivery portion simply reflects whether Oncor or TNMP serves your address. Enter your address for an exact quote and review the EFL.

More Texas cities

See your Lewisville rate in two minutes

Enter your address for an all-in rate — energy, delivery, and a flat membership, with no teaser pricing or bill-credit games.

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.