Rate Comparison
April 24, 2026
6 min read
How Electricity Rate Comparison Works in the Texas ERCOT Market
Commercial rate comparison cycles 5 to 12 REP quotes through an RFP. Here is the process, a 5-line normalization worksheet, and how ERCOT zones change the answer.
Electricity rates comparison texas searches return aggregator sites built for residential customers, but commercial electricity rate comparison in Texas runs on a different process entirely. A commercial Request for Proposal (RFP) cycles five to twelve REP quotes through a broker or direct-channel solicitation, and the spread between the best and worst quote on the same load profile typically runs 1.0 to 2.0 cents per kilowatt-hour on supply alone. For a business burning 1 million kWh per year, that spread is $10,000 to $20,000 in annual energy cost. This deep dive sits inside the broader Texas deregulated electricity market playbook for businesses, focused specifically on how rate comparison actually works in the ERCOT market for commercial buyers. ERCOT projects commercial load growth of 1.9% in 2026 and 2.5% in 2027, which adds pressure on every term sheet a buyer evaluates this cycle.
The Commercial Electricity Rate Comparison Process
Commercial rate comparison in Texas runs through one of two channels: a broker-facilitated RFP that solicits multiple PUCT-certified REPs at once, or direct outreach to individual REPs by the buyer. Both paths require the same underlying inputs: at least 12 months of interval usage data, a Letter of Authorization (LOA) granting the broker or REP access to the customer's account, and a clear scope (term length, start date, swing tolerance, contract structure).
The standard process breaks into five steps:
1. **Pull interval data.** The Transmission and Distribution Utility (TDU) records 15-minute interval usage for every commercial meter. Request a 24-month billing history via LOA from the current REP or directly from the TDU.
2. **Define the scope.** Term length (typically 12, 24, or 36 months), start date, fixed versus index versus block-and-index, swing tolerance, and 4CP pass-through treatment.
3. **Solicit quotes.** A broker pings 25+ REPs simultaneously in a reverse auction; typically 5 to 12 return quotes within 3 to 5 business days. Direct buyers contact 3 to 5 REPs individually.
4. **Receive Term Sheets.** Each REP returns a Term Sheet (the commercial equivalent of a residential Electricity Facts Label) listing supply rate, swing tolerance, MTM rate, pass-throughs, and clauses. Commercial market rules and protocols are published in the [ERCOT Commercial Operations Guide](https://www.ercot.com/mktrules/guides/commercialops).
5. **Normalize and compare.** Convert each quote to an all-in cents per kWh figure using the same usage assumption. That normalization is the next section.
Apples-to-Apples Normalization: The 5-Step Commercial Rate Comparison Checklist
A "lowest c/kWh" comparison is misleading because REP quotes vary in what they include. The U.S. Energy Information Administration publishes a Texas commercial average in the mid-8-cent range, but that figure is bundled and omits the pass-throughs a commercial Term Sheet often itemizes separately. Use the 5-step commercial rate comparison checklist on every quote:
1. **Energy Supply** (the headline c/kWh).
2. **Plus TDU Delivery** (set by territory: Oncor, CenterPoint, AEP North, AEP Central, and TNMP each publish different delivery rates, roughly 4.0 to 5.5 c/kWh depending on rate class).
3. **Plus Ancillary Services** (often 0.10 to 0.30 c/kWh; sometimes baked into supply, sometimes itemized).
4. **Plus Capacity Charges** (4CP pass-through if applicable, varies by demand profile).
5. **Plus Regulatory Fees** (RRPP, decommissioning, gross receipts tax; typically 0.15 to 0.40 c/kWh combined).
Total all-in rate equals the sum of lines 1 through 5. This is the only number that compares quotes apples-to-apples. Two quotes with the same headline supply rate can differ by 1.0 or more c/kWh once TDU, ancillary, and pass-throughs are added. The gap between headline and all-in delivered rate typically runs 2 to 5 c/kWh.
How ERCOT Zones Affect Rate Quotes
ERCOT divides Texas into four congestion zones: North, Houston, South, and West. Wholesale prices clear separately in each zone based on local supply, demand, and transmission constraints. REP supply rates reflect zonal price expectations, so the same business with the same usage profile can receive different supply quotes depending on the zone. According to ERCOT CEO Pablo Vegas, the vast majority of new large-scale power connection requests now come from data centers, which is why forward curves in Oncor and CenterPoint territories have widened relative to the South and West zones.
Houston Zone commercial supply rates often run 0.2 to 0.5 c/kWh above North Zone rates during summer congestion. Data center concentrations in Oncor (North) and CenterPoint (Houston) territories are expected to continue widening zonal spreads through 2026 and 2027 as new gigawatts of load come online. A meaningful texas electricity provider comparison requires asking each REP which ERCOT zone was used to price the quote. A REP with tighter zonal pricing may be passing more market risk back to the buyer through uncapped pass-through clauses.
What Commercial Buyers Should Do During Rate Comparison RFPs
1. Start the RFP 90 to 180 days before contract end. Pricing windows past 180 days carry forward premiums; under 30 days risks the holdover rate (often 20% to 40% above market).
2. **Standardize the scope before soliciting.** Same term length, same swing tolerance, same start date for every REP.
3. **Request Term Sheets, not just rate quotes.** A bare c/kWh number cannot be normalized.
4. **Use the 5-line worksheet on every quote.** Add energy, TDU, ancillary, capacity, and fees. Compare on all-in cost.
5. **Confirm the ERCOT zone used to price.** Ask each REP which zone assumption sits in the quote.
6. **Check the spread.** A quote 1.0 or more c/kWh below the rest of the field is either a great deal or a quote with hidden pass-throughs. Read the Term Sheet line by line for unbounded ancillary, true-up, or bandwidth clauses.
7. **Verify against current commercial plan data** using the [current commercial plan CSV](https://texascommercialplans.com/download/) for an independent benchmark.
Frequently Asked Questions
What is the difference between residential and commercial rate comparison in Texas?
Residential rate comparison runs through Power to Choose, where rates are bundled and standardized into Electricity Facts Labels. Commercial rate comparison runs through broker RFPs or direct REP outreach, returns custom Term Sheets, requires a 24-month billing history plus 4CP interval data, and prices each quote against the buyer's specific load profile and ERCOT zone.
How many REPs typically respond to a Texas commercial rate RFP?
A broker-facilitated RFP typically returns 5 to 12 quotes from REPs that actively serve commercial accounts of the buyer's size. Spreads between the best and worst quote on the same scope typically run 1.0 to 2.0 cents per kilowatt-hour on supply alone, or roughly $10,000 to $20,000 per year per million kWh of load.
Why do REP quotes vary so much for the same business?
Differences come from how each REP prices ERCOT zonal risk, capacity charge exposure, contract margin, and how aggressively they pass through versus absorb regulatory fees. A REP comfortable with the buyer's load shape will price tighter; one less familiar will add a risk premium. ERCOT forward-curve volatility on the day the quote is issued also moves rates by 0.1 to 0.3 c/kWh.
Can a Texas business run rate comparison without a broker?
Yes. Direct rate comparison works for buyers willing to contact 3 to 5 REPs individually, share interval data via LOA, and review Term Sheets line by line. The trade-off is buyer time: a broker centralizes the RFP and normalizes quotes; direct comparison shifts that work to the buyer. For loads above 1 million kWh per year, the broker fee is often offset by tighter pricing from competitive solicitation. Have questions on a specific RFP? Get in touch.
Photos by Mark Patterson, Morgan Von Gunten, and Luke Chesser on Unsplash.
Originally published at texascommercialplans.com
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