Utility Check

Oncor Bill Explained: Understanding Every Charge

Last updated: January 2026

Your electricity bill in Oncor territory contains charges from both your retail electricity provider (REP) and Oncor as the transmission and distribution utility. Understanding each component helps you verify accuracy and find savings.

Energy Charges

Energy charges come from your retail electricity provider and include:

  • Energy charge: Per-kWh cost for the electricity itself
  • Base charge: Fixed monthly fee (varies by provider)
  • Usage credits/fees: Bonuses or penalties at certain usage levels

These charges vary based on your chosen plan and provider.

Oncor TDU Charges

Oncor's TDU charges cover delivery and include:

  • Delivery charges: Per-kWh cost for transmission and distribution
  • Customer charge: Fixed monthly meter and service fee
  • System benefit fund: State-mandated assistance programs

TDU charges are the same regardless of your REP.

Taxes and Fees

Additional charges may include:

  • State and local taxes
  • Franchise fees (paid to your city)
  • Regulatory fees

These typically add 5-10% to your base charges.

Key Items to Check

  1. Verify your meter readings match your usage
  2. Calculate your effective rate and compare to your EFL
  3. Check for any unexpected fees or charges
  4. Confirm your plan type (fixed vs. variable)
  5. Look for usage credits if your plan offers them

Quick Oncor Bill Check

Enter your bill details below to see if your rate appears typical for Oncor customers.

Quick Bill Sanity Check

No upload required. Enter two numbers from your bill to see if it falls within typical ranges for Oncor.

Most utility bills are calculated correctly.

This quick check helps you understand if your bill stands out from typical ranges. It cannot determine accuracy without a full bill review.

The "Total Amount Due" on your bill

Usually labeled "Total kWh" or "Usage"

Disclaimer: This tool provides a rough estimate based on typical residential rates. It does not account for fixed charges, demand charges, time-of-use pricing, taxes, fees, or other bill components. Results are for informational purposes only and should not be considered financial or legal advice. We cannot determine billing accuracy without reviewing your full bill.

Want a Definitive Answer?

The sanity check above provides context, but it can't verify your actual bill. Upload your Oncor bill for a complete verification of billing math, rate application, and usage patterns.

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Is My Oncor Bill Correct?

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Frequently Asked Questions

Why does my bill show charges from both my REP and Oncor?

In Texas's deregulated market, your REP provides the electricity and Oncor delivers it. Some REPs show these separately, while others bundle them together. Either way, you're paying for both.

What is the System Benefit Fund charge?

The System Benefit Fund is a state-mandated charge that funds low-income assistance programs, customer education, and other public benefits. It's a small per-kWh charge on all Texas electricity bills.

Can I dispute charges on my bill?

Yes, contact your REP for energy charge disputes or Oncor for TDU charge disputes. You can also file complaints with the Public Utility Commission of Texas if issues aren't resolved.