What role does forecasting play in managing a grid with high shares of wind and solar?

• A. Forecasting helps anticipate renewable output and plan generation and dispatch.
• B. Forecasting is unnecessary for grid operation.
• C. Forecasting eliminates the need for energy storage.
• D. Forecasting increases the cost of electricity without benefit.

Answer: (B)

Forecasting is essential for managing a grid with high shares of wind and solar because those resources can change quickly and unpredictably. By predicting how much sun or wind will be available and what demand is likely, operators can schedule which generators to run, when to ramp them up or down, and how much fast-responding capacity or storage to keep in reserve. This ahead-of-time planning improves dispatch, maintains reliability, and helps reduce balancing costs by aligning actual production with expectations rather than reacting in real time. Forecasts also guide storage use and market bids, smoothing out variability and keeping prices steadier.

In short, predicting renewable output makes it possible to plan generation and use of storage effectively, rather than operating blindly.