Before revision: Configuration Combined-cycle systems can have single-shaft or multi-shaft configurations.
After revision: HydrogenXcel Energy is going to build two natural gas power plants in the Midwest that can mix 30%DIF > hydrogen with the natural URL Intermountain Power Plant is being retrofitted to a natural gas/hydrogen power plant that can run on 30% hydrogen as well, and is scheduled to run on pure hydrogen by URLConfiguration Combined-cycle systems can have single-shaft or multi-shaft configurations.