Vertical axis wind turbine (VAWT) - advantages in offshore locations

https://youtu.be/Qc0rF58pP3c

The system is a moored deep-sea turbine that hoists a weight up from the sea floor, and when power is needed, it drops the weight which generates power on demand. 

He points out: 

7:03 although vertical axis wind turbines have slightly lower efficiency, they can operate in a wider range of wind speeds - 10:34 from 8 to 80 mph (vs 30-55mph for traditional horizontal axis turbines.) 8:01 It doesn't have delicate electronics connected to the blades, just a winch - allowing it to hoist the weight across a wider range of windspeeds. 

7:25 They can be installed closer to each other because there's less turbulence downstream. 

11:00 they can generate 4 times as much energy per area of sea surface. 

11:13 power output can match demand without battery storage because they're able to produce energy regardless of the wind speed

This video makes some good points about the advantages of vertical axis turbines, which can be small, and with this design they can produce energy on demand.

 7:43 Hydro Omni doesn't produce electricity directly from the wind. Instead it uses the wind to lift a heavy mass [up from the sea floor] - then when energy is needed the weight can be dropped powering a generator. This has some really interesting benefits 1) the Omni can operate in a much wider range of wind speeds because they don't have delicate electronics and generators attached to the turbines and 2) they can lift the weight faster or slower through a much wider range of wind speeds also unlike traditional wind turbines and 3) [produce energy on demand]

https://hw.energy/energy/