It behaves exactly as an un-powered (but spinning) generator. In the industry these are known as a "Synchronous Condenser" or Syncom. They have been in use for

It behaves exactly as an un-powered (but spinning) generator. In the industry these are known as a "Synchronous Condenser" or Syncom. They have been in use for a long time. https://www.pv-magazine-australia.com/2019/04/06/long-read-behind-the-limited-return-of-the-syncon/ https://www.pv-magazine-australia.com/2019/04/06/long-read-b... One problem with the switch to renewable energy is that the mechanical momentum in steam turbines is lost. This leaves the grid vulnerable to rapid changes in loading.