WattMarkets
—NYISO updated 19m ago
PJMWARNINGPeak probability 95% today · window 4:00 PM ET–6:00 PM ET
NYISOWARNINGPeak probability 55% today · window 5:00 PM ET–7:00 PM ET

US power markets, live

Live load, zone prices, and day-ahead vs real-time across US power markets. Daily peak forecasts with public track records.

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ERCOT: 0% todayPJM: 18 of 20 CPs in backtestNYISO: 3 of 4 peaks in backtestISO-NE: 1% today

PJM5CP · 2026today's load vs. current peak · cross the white line and today enters the top five

ActualForecastband = where the forecast usually lands, from 710 measured hoursCurrent 5th peak
5th peak144.2 GW
Who it's for

Built for people with load on the line

Energy managers

Know which afternoons matter. Skip the rest

ERCOT 4CP →PJM 5CP →

Consultants and brokers

Put a graded call in every client report

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Developers

The whole product is an API. Keys are free at sign-in

The API →

The call

Daily peak odds and when to be off

Every market, every morning, in its own timezone. Graded across four ERCOT summers and backtests in PJM, New York, and New England. The window says when to be off, not the whole afternoon.

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Today's callERCOTPJMNYISOISO-NE
Forecast max69.0 GW152.4 GW28.9 GW22.6 GW
Peak to beat83.3 GW144.2 GW31.1 GW25.3 GW
Margin-14.36 GW+8.17 GW-2.23 GW-2.73 GW
Temp anomaly-9.85°F———
Est. curtailment−1.5 GW−0.0 GW−0.0 GW−0.0 GW
p (raw → final)0% → 0%95% → 95%55% → 55%1% → 1%
chance today peaks
CLEAR
0%
WARNING
95%
WARNING
55%
CLEAR
1%
ERCOT
In the tight window now
ends 6:00 PM CT
2:00 PM CT to 6:00 PM CT
PJM
Tight window opens in
0:00:06
5:00 PM ET to 7:00 PM ET · 2h, not the whole afternoon

a 4 in 5 chance the peak lands here ⓘ

NYISO
Tight window opens in
0:00:06
5:00 PM ET to 8:00 PM ET · 3h, not the whole afternoon

a 4 in 5 chance the peak lands here ⓘ

ISO-NE
Tight window opens in
0:00:06
5:00 PM ET to 8:00 PM ET · 3h, not the whole afternoon

a 4 in 5 chance the peak lands here ⓘ

Prices

Day-ahead vs real-time prices

Yesterday's day-ahead prices against what real-time actually did, and live prices for the zones people watch. Every market we cover.

The call above says when to be off. These say what the power cost.

Yesterday's spreadERCOTPJMNYISOISO-NE
DA average$35.29$52.09$57.21$55.34
RT average$30.05$42.22$56.26$54.40
Widest hour−$15.14 · 7 PM CT−$61.62 · 6 PM ET+$22.13 · 5 PM ET+$37.46 · 10 AM ET
avg spread, RT minus DA
RT under DA
−$5.24
RT under DA
−$9.87
RT under DA
−$0.95
RT under DA
−$0.95
Zone prices now · $/MWh
ERCOTHouston $21.83North (DFW) $22.58
PJMZone avg $157.08ComEd (Chicago) $210.30
NYISONew York City $65.73Long Island $65.37
ISO-NEBoston $42.34
The record

Every call on the record

Every call is logged when it's made, hashed so it can't be rewritten, and graded against official settlements. One record per market.

The ERCOT 4CP record

4 graded summers
every call
Peaks caughtDays flaggedFalse alerts
▲ WattMarkets15 of 1682134h
Alert every hot day16 of 16105178h

The PJM 5CP record

every call
Peaks caughtDays flaggedFalse alerts
▲ WattMarkets18 of 203636h
Alert every hot day20 of 2086132h

The NYISO ICAP record

every call
Peaks caughtDays flaggedFalse alerts
▲ WattMarkets3 of 42238h
Alert every hot day4 of 42546h

The ISO-NE the capacity tag record

every call
Peaks caughtDays flaggedFalse alerts
▲ WattMarkets3 of 366h
Alert every hot day3 of 31830h
See the track records
The delivery

Four sends a day, max

One WATCH the evening before. One WARNING by mid-morning. ACTION when it's time. STAND DOWN when it's over. Per market, only for the markets you follow.

Get alerts
  • Emaillive

    The WATCH, the evening before

  • SMSlive soon

    WARNING and ACTION, on your phone

  • Webhookslive

    Signed JSON to your systems

  • Calendar feedlive

    Risk windows on your calendar

Everything here is free

The API key is free at sign-in. No card, no trial clock.

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