The SPG turbine is based on Darrieus/Gorlov principles, and resembles an old fashioned cylinder lawnmower or a stretched waterwheel. The advantage is that it presents a rectangular, blocking face to the water flow unlike arrays of propeller type tidal turbines which leave gaps. World class marine composite engineers designed the rotor which combines speed and strength, using the same technology as for offshore power boats and even Americas Cup contestants.
Torque transducers as used in Formula 1 and ocean going ships to measure power, were incorporated to measure power at the rotor. The drive train, electronics and grid connections will be standard off the shelf components with fully warranted efficiencies in the production turbine.
In tidal applications, where the tide changes direction every 6 hours, battery and/or pumped storage will be installed where appropriate to flatten the sine wave curve and provide continuous power.