What happens when the wind drops?
Wind is one part of an electricity system. Operators balance the full system as both demand and generation change.
Reviewed 2 November 2026 · Republic of Ireland
Look at the whole system
EirGrid’s dashboard reports demand, generation, wind and interconnection. Reading these together gives more context than treating the wind number as a complete account of electricity supply.
Other generation and electricity transferred through interconnectors form part of that wider picture. Storage and changes in consumption can also help balance power over time. None should be treated as an unlimited replacement for another: the system’s actual operating conditions matter.
A forecast is not a guarantee
Forecasts help operators prepare for expected conditions. The public dashboard distinguishes forecast wind from actual wind output. This index deliberately uses actual output and actual demand; it does not fill gaps with a forecast.
Low wind is not the same as an outage
A low wind-to-demand ratio says something about the contribution of wind during that interval. On its own, it does not establish whether there was a shortage, a system alert or a loss of supply.
The low-wind run on the homepage is a limited descriptive measure: consecutive observed quarter-hours in which wind output was below 10% of demand. That threshold is an index definition, not an official weather classification. Missing data breaks a run, and a run may continue beyond the observed window.