Offshore wind is interesting to compare to tidal power and wave power. Tidal projects seem to go OK, while wave power companies as a rule go bankrupt without ev

Offshore wind is interesting to compare to tidal power and wave power. Tidal projects seem to go OK, while wave power companies as a rule go bankrupt without ever finishing a utility-scale installation. Looking at failed wave-power startups, I find some common features: - surface-level equipment exposed to breaking waves, - complicated mechanical parts, - electrical equipment on or under water, - expensive parts (turbine, generator) duplicated for each unit - a heavy, expensive to build bunker. In offshore wind, the expensive parts -- turbines -- are both offshore and duplicated, and the tower is very big and expensive. On the plus side, the turbines are held well away from salt water, and their mechanical operation is simple (although feathering the blades adds complexity). The power transmission tie-in is at or under the water, but has no moving parts, and can be shared with lots of turbines. It is not surprising that the bigger and taller wind turbines are, the better they get. One big turbine a mile high ought to do best, if you could build it. Tidal has underwater turbines with expensive generators inside, duplicated, but it is anyway protected from surface insults. Are tidal projects mainly government sponsored? It strikes me that the sweet spot for wave power would be a system where moving parts are under the surface and protected from breaking waves, where any needed mechanical parts are extremely simple and reliable, and where any expensive, fragile or high-maintenance parts are onshore and indoors. Thus, I would have high hopes for a system anchored sub-surface that pushes air or water through a culvert/plenum to a turbine in a regular building on-shore. A single plenum, turbine, and generator could serve a whole fleet of energy-collection units out in the water. Closed-loop air, or at least dry air sourced from on shore, is appealing vs. moving sea water or sea air through a turbine, which turbines don't like so much. Thus, I like https://m.youtube.com/watch?v=m6MJpiUEKaU https://m.youtube.com/watch?v=m6MJpiUEKaU and https://m.youtube.com/watch?v=yfSAN-2pz9w https://m.youtube.com/watch?v=yfSAN-2pz9w although I would want the turbine part moved onshore and shared. The latter is uniquely interesting as it takes advantage of not just waves' vertical motion, but their horizontal progression. The V shape is interesting as it takes energy from a wide front of the wave. This one https://m.youtube.com/watch?v=4ehT-ZTHFGg https://m.youtube.com/watch?v=4ehT-ZTHFGg is getting hype lately, but checks all the loser boxes.