[asdefghyk]

The hydro in the article - its IMMEDIATE activation still allowed a million people to experience a 45 minute blackout. Trains stopped etc . Pumped hydro will take anywhere from approximate 60 seconds to several minutes to generating power. It also obviously needs to always kept in reserve for such generator dropouts

[ggm]

It was commissioned in 1984. It's not always kept in reserve. It has a component for black start, it also has a component for surge demand management.