In everyday use, to curtail something is to cut it back. In electricity, curtailment is the deliberate reduction of power generation or consumption when the grid can't use, transmit, or afford the energy available at that moment.
— Overview
Plain English vs. the energy meaning
Curtailment means something simple in plain English and something very specific in energy. The energy version has become one of the largest sources of waste on the modern grid.
This guide covers what "curtail" means, what curtailment means in electricity, the main types, why it happens, why it's a growing problem, and how it's being turned into a paid grid resource.
01 — Definition
Reduce, cut short, restrict
To curtail means to reduce, cut short, or restrict something. "Curtailed" describes something that's been reduced. "Curtailing" is the act of cutting it back. The word applies to budgets, rights, or schedules just as easily as to power. In energy, it takes on a precise operational meaning.
02 — In the Grid
Deliberate, not a blackout
In electricity, curtailment is the intentional reduction of power output or consumption, ordered when the grid is out of balance: too much supply, not enough transmission capacity, or prices that have fallen below zero.
It's deliberate and controlled, which is what separates it from a blackout (an uncontrolled loss of power) and from an outage (an equipment failure). Curtailment is a tool grid operators use on purpose to keep the system stable.
03 — Categories
Wind, solar, generation, load
04 — Causes
Three conditions drive it
05 — Cost
A symptom of a flexibility gap
Every curtailed megawatt-hour is energy that was generated, or could have been, and then thrown away. The costs compound: wasted clean power, weaker returns on the wind and solar farms built to produce it, distorted prices, and emissions from backup generation that flexible demand could have avoided.
Above all, curtailment is a symptom of a flexibility gap. The grid has energy with no buyer at the moment it's cheapest.
06 — The Fix
Flexible demand, proven economics
More transmission helps, but the durable fix is flexible demand: load that consumes surplus when it appears and curtails on command when the grid is tight. A flexible load placed next to stranded wind absorbs power that would otherwise be curtailed, behaving like a battery that charges on excess energy. That function is called virtual energy storage.
On the demand side, load curtailment becomes a paid service. Grid operators compensate loads that reduce consumption during stress, which is what demand response delivers.
In ERCOT, Riot Platforms, a Bitcoin miner operating a fully interruptible compute load, reported $71.2 million in power curtailment credits across 2023 — earned by absorbing surplus power and curtailing on demand.
That's curtailment turned from pure waste into a grid asset, and scaling it is the work Type 3 exists to do.
Type 3 is the software-defined demand response infrastructure company that turns fully interruptible compute loads into a dispatchable, telemetry-verified grid resource. Read the Manifest →
07 — Revenue
Getting paid to curtail
A curtailment credit is a payment a resource earns for reducing its load during a grid event or a high-price interval. In practice, a registered interruptible load earns two streams: a standing payment for being available to curtail, and a performance credit each time it's actually dispatched.
For a large, fully interruptible load, those power curtailment credits can run into the tens of millions of dollars a year, turning the grid's surplus problem into the load's revenue.
Ref — FAQ
Ref — Glossary
See the full glossary in the Manifest
Ref — Sources