This video is about Nitinol memory metal engines that are basically Stirling heat engines and work on a very low temperature difference. This technology can be easily scaled up into the KWatts range and drive a power generator to generate 50 or 60 HZ AC power. If you use solar power via Fresnell lenses to heat the hot water bath you can convert this heat energy into mechanical motion energy and then use a generator to generate 120 Volts 60 Hz AC or 230 Volts 50 Hz AC power.
