no because I never looked.... Just because a technology is mature doesn't mean it is cost effective, widely available, or effective for that matter.
I owned some property outside Atlanta that had running water through the property... not much head but back then I considered combining a low head water turbine with a ground based heat pump. Luckily for me I never had to deliver on that pipe dream (same house with the overly optimistic greenhouse in my attic).Small water turbines don’t require nearly as much mantainace as a wind turbines from what I’ve read. It makes sense to me they take less maintenance because there is less variation in water velocity. Especially in fresh water. Not all mechanical systems are equal in mantainance.
JR