Thanks for the link Bill, as well as all the comments by others.
Motors-as-generators is new to me, seems an exiting field. One advantage is that they come in multiple poles, say 8, which makes them rotate slow, and may aleviate need for gear boxes/pulleys. For hydro, they are also tolerant to run-away speeds.
Regulation is by monitoring voltage which at the same time keeps frequency in check. The equivalent in generators would be the ELC which monitors frequency.
I have a contact for England and another for Australia which sell IGCs commercially. My question here aimed at also finding outlets in Canada/USA.
More later,
Werner