Duck curve

This article is about a curve for electric power generation. For a duck-shped curve in electrochemical analysis, see cyclic voltammetry.

The duck curve is a graph showing the electricity demand remaining after subtracting electricity supplied by variable renewable energy sources (primarily solar) over the course of a day. This highlights the timing imbalance between demand and solar power generation, which must be filled by dispatchable generation (usually non-renewable). The curve is named for its visual similarity to the outline of a duck. Used in utility-scale electricity generation, the term was coined in 2012 by the California Independent System Operator.

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