the New York ISO's published schedule of generation on planned outage — the supply side of every tight hour, known in advance.
Which New York units are scheduled off, and when?
NYISO planned outages peaks at 11,243 MW on Tue, 12 AM, against a low of 8,341 MW — a swing of 2,902 MW across the window. Planned outage capacity is the heaviest area at 11,243 MW.
Plotted window Oct 13, 12:00 AM EDT → Nov 11, 12:00 AM EST. Republished by the New York ISO as the schedule changes; the latest is shown. Source snapshot Oct 12, 5:35 AM EDT.
What each line is
Every line above, and who produced it.
Planned outage capacityforecast
A published forecast for the plotted target intervals. Source: the New York ISO.
Day by day
Each day of the window on its own.
Which hours are tightest
Every hour of the window, shaded by load.
Forecast load by day and hour of day
0
6
12
18
Tue, 10/13
Outage summary
Outage summary
Series
Peak (MW)
Peak hour
Low (MW)
Average (MW)
Planned outage capacity
11,243
Tue, 12 AM
8,341
9,616
Where these series come from
Forward-looking series on this page
Series
Produced by
Method
Horizon
Issued
Planned outage capacity
the New York ISO
NYISO generator maintenance forecast
About a month ahead, daily
Issue time not exposed by this feed
Uncertainty
This is a schedule rather than a forecast, so its uncertainty is of a different kind: outages get rescheduled, extended, and cancelled, and forced outages arrive with no notice at all and never appear here.
What this shows
What this shows
Generating capacity that the New York ISO expects to be unavailable because it is scheduled off for maintenance. This is a published schedule rather than a prediction: units submit planned outages in advance, and this is the total the market expects to be missing at each point in the window.
Why it matters
New York plans generator maintenance a month out, which makes this the longest-range forecast published anywhere on this site. It matters most around the New York City load pocket, where transmission limits mean local capacity cannot simply be replaced from upstate.
How to read it
Look for the clusters. Maintenance is scheduled into low-demand weeks on purpose, so a heavy block sitting near a forecast warm spell is the thing to notice.
What is not in it
Forced outages. A unit that trips has not scheduled anything, so it cannot appear here — and forced outages are precisely what turns a comfortable planned margin into a scarcity event. Read this as the floor under how much capacity is missing, never the total.
Connect your agent to mcp.askthegrid.com and this forecast is a tool call away — the same host Claude and ChatGPT connectors already use.
What people ask
What is a planned generation outage?+
A generating unit taken offline deliberately for maintenance, refuelling, or repair, scheduled with the grid operator in advance. Operators concentrate them in low-demand seasons so the capacity is missing when it is least likely to be needed.
Why does this go so much further out than the other forecasts?+
Because maintenance is scheduled, not predicted. NYISO publishes an agreed calendar of planned outages roughly a month ahead, so the horizon is limited by how far ahead operators have committed rather than by how far ahead anything can be forecast.
How does this affect prices?+
Capacity that is out cannot bid. Removing a large block of it from the supply stack means the market clears further up that stack for the same demand, so a heavy outage day and a high demand day landing together is the classic setup for a price spike.