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ERCOT transmission · PUCT Project 58000 · proposal of July 9, 2026

What 12CP will cost your facility

Free. No signup. Pick a facility, type your numbers, or load your meter data.

Your transmission charge changes by

$0

a year

Your facility

MW
MW What you draw when you are not curtailing.
MW
of 4
of 12 Twelve monthly peaks, one every month, instead of four summer peaks.
$/kW-yr ERCOT average is $66.76. Utilities range about $40 to $76.

Run it on your own bills

This page estimates. Your invoices, contract and interval data settle it. Pallara replays your last 12 months under 4CP, the 12CP proposal and the large-load minimum, and shows where your bill moves.

Email Pallara about your site Price every year of your ramp Public context only. Do not attach meter files.

Use my real meter data

Load a CSV of your interval data. You get your actual 4CP demand for 2023 to 2025 and a preliminary 2026 figure, an estimated 12CP demand for the twelve months to September 2025 or September 2026, and the charge change from your own numbers.

Your file never leaves this browser. Nothing is uploaded.

MW Used for the large-load minimum. Left blank, your highest 15-minute demand in the same October to September year is used.
Expected format

A header row is optional. Times are Central Prevailing Time, as YYYY-MM-DD HH:MM, ISO 8601 (with or without an offset), or MM/DD/YYYY HH:MM. Comma, semicolon or tab separated. Files with separate date and start-time columns also work, such as Smart Meter Texas interval exports.

Values may use a decimal point or a single decimal comma (quote the value in comma-separated files). Thousands separators and mixed punctuation are not supported.

timestamp,kW
2025-08-18 16:30,95210
2025-08-18 16:45,3040
2025-08-18 17:00,2980
2025-08-18 17:15,94870

The four summer peaks

    Stem height is ERCOT total demand. Load your meter data to color each peak by what your site drew.

    What is changing

    The PUCT has proposed replacing 4CP. Loads that curtail through four summer peaks today pay almost no transmission charge. The proposal measures twelve monthly 30-minute peaks instead, and bills large loads (sites under §25.194, which starts at 75 MW) on the greatest of contracted peak, the highest non-coincident peak in the past year, or 12CP demand, for no less than 20 years.

    Proposal adopted for commentJul 9, 2026
    Rules required by law (SB 6)Dec 31, 2026
    Proposed minimum-demand term20 years
    Facilities responding to 4CP (2024)1,080

    How this is calculated

    1. Today, 4CP billing demand is the average of your load during the four summer coincident peaks. With the inputs, each peak you curtail counts at your curtailed load and the rest count at your normal load.
    2. The proposal does not define a single customer's 12CP demand. It defines 12CP only for distribution utilities, as the average of their demand in the twelve 30-minute monthly ERCOT peak intervals (§25.192(b)). This tool applies the same average to your load, counted the same way. That is our assumption, not rule text.
    3. For loads of 75 MW and up, billing demand becomes the highest of contracted peak, last year's highest peak, and 12CP demand. With the inputs, last year's highest peak is taken as your normal load.
    4. Annual charge is billing demand in kW times the rate. The 20-year figure is nominal, with no escalation or discounting.
    5. With meter data, 4CP demand is the average of your kW in the four official 15-minute intervals ERCOT reported to the PUCT for 2023, 2024 and 2025. The 4CP report does not say whether its times start or end an interval. ERCOT's Demand and Energy Report lists the same twelve peaks as "interval ending", so this reads 17:00 as 16:45 to 17:00. The 2026 4CP is preliminary until ERCOT posts it by December 1; until then this uses the June to September peaks from the Demand and Energy Report, and August and September 2026 are still on ERCOT's initial settlement, so they can move.
    6. Readings are grouped into 15-minute intervals and averaged. Hourly readings fill all four intervals in their hour. kWh values are converted to kW by the interval length.
    7. The 12CP demand from meter data is an estimate. The proposal uses each month's 30-minute ERCOT peak from October 1 through September 30. ERCOT publishes each month's peak 15-minute interval but no 30-minute series, so this uses your average over the clock half-hour that contains that 15-minute peak; ERCOT's 30-minute peak could fall in the neighboring half-hour. Winter months peak in the morning: December to February peaked between 07:00 and 08:30 in both years. Your file is compared for the latest October to September year whose twelve peak half-hours it contains, against the 4CP of the summer that ends it. Your highest demand is taken from the readings in that year, so a file with gaps can understate it.
    8. A peak is marked curtailed when your load in that interval is at most half your June to September average for that year.

    Not settled yet: the final rule text, whether the minimum reaches loads already connected, how a single customer's 12CP demand is measured, when 12CP first binds (the proposal ties it to the next annual transmission rate docket), and the 12CP rate itself, which will be reset when the charge is spread over different demand. Treat this as an estimate of direction and size, not a bill.

    Sources:

    Decision support, not legal or rate advice. Check the final rule before acting.