Definition
Curtailment is the forced reduction of a solar plant's output by the utility operator, typically due to transmission constraints, oversupply during low demand, or grid stability requirements. Reduces plant revenue and complicates PR/availability calculations.
Key Takeaways
- Curtailment = utility-forced solar output reduction.
- Different from clipping (which is internal design choice).
- Compensated or unpaid depending on PPA terms.
- Common in California, Texas, India, Germany.
- Tracked separately from PR in performance reporting.
Frequently Asked Questions
4 commonly searched questions about Curtailment.
What is curtailment?
Utility-forced reduction of solar plant output. Different from inverter clipping (which is design-driven). Curtailment is external; clipping is internal.
Why does curtailment happen?
Transmission congestion, midday grid oversupply (duck-curve), unit-commitment economics, frequency stabilization.
How is curtailment compensated?
PPA-specific. Some PPAs include 'deemed energy' clauses paying the developer for curtailed energy. Others place the risk on the developer.
Where is curtailment common?
California (high solar penetration), Texas ERCOT, parts of India, Germany, Spain. Increasingly common as renewable penetration grows.
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