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United States · Texas · electricity · Prices checked yesterday · 14 November 2026 · re-read daily

Electricity in ZIP 75166

ZIP 75166 is in Collin County, where EIA-861 records Oncor and TNMP beside 5 utilities whose customers cannot choose a retailer; the delivery utility on your bill decides which applies. Cheapest at 2,000 kWh: Oncor: Ranchero Power No Contract Advantage at 9.5¢/kWh; TNMP: Ranchero Power No Contract Advantage at 10.5¢/kWh, as listed on Power to Choose on 2026-11-14.

Rank at500 kWh1,000 kWh2,000 kWh

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Who delivers here

  • Collin County
    • Denton County Elec Coop, Inc · co-op, municipal or outside the competitive market: no retailer choice
    • Fannin County Electric Coop · co-op, municipal or outside the competitive market: no retailer choice
    • Farmers Electric Coop, Inc - (TX) · co-op, municipal or outside the competitive market: no retailer choice
    • City of Farmersville - (TX) · co-op, municipal or outside the competitive market: no retailer choice
    • Grayson-Collin Elec Coop, Inc · co-op, municipal or outside the competitive market: no retailer choice
    • TNMP · competitive delivery utility: you choose the retailer
    • Oncor · competitive delivery utility: you choose the retailer

Counties from the Census 2020 ZCTA-to-county file (largest land share first); utilities from EIA-861 2024 Service Territory, both read 2026-11-06.

Cheapest at 2,000 kWh on each zone here

  1. 1. Ranchero Power · No Contract Advantage on Oncor
    9.5¢/kWh at 2,000 kWh
    10.9¢/kWh at 500 kWh, 9.9¢/kWh at 1,000 kWh · variable · 1 months
    Go to Ranchero Power
  2. 2. SOUTHERN FEDERAL POWER LLC · Variable Advantage on Oncor
    9.5¢/kWh at 2,000 kWh
    10.9¢/kWh at 500 kWh, 9.9¢/kWh at 1,000 kWh · variable · 1 months
    Go to SOUTHERN FEDERAL POWER LLC
  3. 3. SMARTENERGY HOLDINGS LLC · SmartGreen 3 on Oncor
    9.5¢/kWh at 2,000 kWh
    10.9¢/kWh at 500 kWh, 10.0¢/kWh at 1,000 kWh · fixed · 3 months
    Go to SMARTENERGY HOLDINGS LLC
  4. 4. JUST ENERGY · Sustainable Days Bundle - 3 on Oncor
    9.6¢/kWh at 2,000 kWh
    10.9¢/kWh at 500 kWh, 10.0¢/kWh at 1,000 kWh · fixed · 3 months
    Go to JUST ENERGY
  5. 5. JUST ENERGY · Sustainable Living Bundle - 3 on Oncor
    9.6¢/kWh at 2,000 kWh
    10.8¢/kWh at 500 kWh, 10.0¢/kWh at 1,000 kWh · fixed · 3 months
    Go to JUST ENERGY
  6. 1. Ranchero Power · No Contract Advantage on TNMP
    10.5¢/kWh at 2,000 kWh
    12.4¢/kWh at 500 kWh, 11.1¢/kWh at 1,000 kWh · variable · 1 months
    Go to Ranchero Power
  7. 2. SOUTHERN FEDERAL POWER LLC · Variable Advantage on TNMP
    10.5¢/kWh at 2,000 kWh
    12.4¢/kWh at 500 kWh, 11.1¢/kWh at 1,000 kWh · variable · 1 months
    Go to SOUTHERN FEDERAL POWER LLC
  8. 3. JUST ENERGY · Sustainable Days Bundle - 3 on TNMP
    10.7¢/kWh at 2,000 kWh
    12.5¢/kWh at 500 kWh, 11.3¢/kWh at 1,000 kWh · fixed · 3 months
    Go to JUST ENERGY
  9. 4. SMARTENERGY HOLDINGS LLC · SmartGreen 3 on TNMP
    10.7¢/kWh at 2,000 kWh
    12.6¢/kWh at 500 kWh, 11.3¢/kWh at 1,000 kWh · fixed · 3 months
    Go to SMARTENERGY HOLDINGS LLC
  10. 5. JUST ENERGY · Sustainable Living Bundle - 3 on TNMP
    10.8¢/kWh at 2,000 kWh
    12.5¢/kWh at 500 kWh, 11.3¢/kWh at 1,000 kWh · fixed · 3 months
    Go to JUST ENERGY

Places in ZIP 75166

The Census records Lavon, Wylie, Dallas in ZIP 75166, in Collin County.

LavonWylieDallasCollin CountyEvery plan on OncorEvery plan on TNMP

Another ZIP

Which counties it is in and which delivery utilities serve them.

Says which counties the ZIP is in and which delivery utilities serve them, from the Census and EIA-861. Which one serves your address is on your bill.