Know how much nuclear is off the grid, what's coming, and what it's worth.
NukeGryd turns the North American reactor fleet into a tradable signal: megawatts offline by ISO across the U.S. and Ontario, a probabilistic forward curve, and what a supply loss means for on-peak price. Built on data nobody else assembles.
94 U.S. reactors and 16 Ontario units, covering PJM, MISO, ERCOT, CAISO, ISO-NE, NYISO, SPP and IESO.
Nuclear availability 93.0, down on the week
The U.S. nuclear fleet sits at a Nuclear Availability Index of 93.0, down 2.4 on the week, with 6,767 MW offline, 7.0% of capacity.
Read the full Nuclear Supply Outlook →Three numbers nobody else publishes
every one of them scored against what happenedand duration, per unit
days past the published date
days back to full power
We publish our own score
See the full recordAnyone can publish a forecast. We publish how well ours did, scored against what actually happened, rescored every morning, for every operating reactor. If the number moves against us, it moves in public.
National supply curve
Total MW offline by day, back through every season and forward through the next. One continuous availability signal, free.
A page for every reactor
All 94 U.S. units, each with its own page: today's power level, capacity and operator, its full outage record separated into refuels and forced outages, the refueling designators the industry itself uses, its breaker-to-breaker streak and its operating license. Free to read, and the record behind it is what the score is built on.
How well each unit runs
One 0-100 score per reactor, computed from 27 years of daily records: capacity factor, forced-outage days, streak length, fuel utilization, refuel and startup duration, scram rate. Ranked against comparable units, not against the whole fleet. It is why a published date from one operator means something different from the same date filed by another.
A page for every market
PJM, MISO, ERCOT, CAISO, ISO-NE, NYISO, SPP and the vertically integrated utilities, each with its generators listed: who owns them, what they are doing today, and how they behave. Pick a market once and the whole site follows you into it.
Season against season
Nuclear runs on a two-season clock, so the only honest comparison is the same season in a different year. Compare one market across years, or several markets against each other, nationally or per market.
The next twenty years
Operating license expiry and renewal for every unit, capacity added through uprates, what is being built and what has announced a retirement date. The structural picture underneath the outage schedule.
Probabilistic forward curve
Projected refuels and their MW impact months ahead, as a P10 / P50 / P90 confidence band you can size against, not a single guess. Sourced outage dates where we hold them, model projection beyond.
ISO / RTO breakdown
PJM, MISO, ERCOT, CAISO, ISO-NE, NYISO, SPP and the non-ISO Southeast and West, every unit attributed to its balancing authority, plus Ontario (IESO) as a parallel fleet, reported hour by hour and never blended into the U.S. totals.
Ontario, to the hour
Bruce, Darlington and Pickering, per unit, straight off the IESO market feed and refreshed hourly. Outage onset carries the hour a unit actually came down, not just the day. Reported as its own fleet, never blended into the U.S. numbers.
Market impact
Nuclear supply set against ISO demand, gas and on-peak price, with a supply-shock backtester and a forward estimate of what an outage is worth in dollars per MWh when the grid is tight.
Outage-risk radar
The units most likely to surprise the market, ranked: model-projected overruns and live forced-outage exposure, rolled up by ISO.
Same-day NRC wire
Scrams, trips and power cuts read from the NRC event feed the same day they are filed, matched to the fleet and to the units you follow.
Scenario builder
Slip a start, extend a refuel or drop in a hypothetical trip, and the national supply curve redraws as you move it, with the estimated price impact of your what-if.
Weather & fuel context
Heating and cooling degree days and the gas regime explain why a loss bites or gets absorbed, with seasonal normals and an 18-month forecast.
Alerts & watchlists
A morning brief of the supply shifts that matter, by email or Slack webhook, filtered to the ISOs and units on your watchlist.
API & signal library
Every series, MW offline, ISO splits, prices, degree days and the raw model features, in a keyed JSON API and documented CSVs for your own models.
See it work before you pay for it.
The full national curve and today's snapshot are free, forever. The probabilistic forward curve, the ISO breakdowns, the price-impact layer and the scenario builder are where you get ahead of the move, and they unlock the instant you subscribe.