the purpose of including that video was to show that hydrogen can power engines.
How much does hydrogen gas cost if created with solar panels?
Honda Introduces Solar Hydrogen Station on Saitama Prefectural Office Grounds
...This is the first installation in Japan of a total system to produce, store and dispense hydrogen with ZERO CO2 emissions.
A high pressure water electrolysis system, uniquely developed by Honda, produces hydrogen. With no mechanical compressor, the system is nearly silent and highly energy efficient. Using Solar and grid power, the system is capable of producing 1.5kg of hydrogen within 24 hours which enables an FCX Clarity to run approximately 150km or 90 miles. Honda aims to further develop the system to offer clean energy sources for the home in the future...
http://world.honda.com/news/2012/4120327Solar-Hydrogen-Station/index.html

(that is not the Saitama Prefectural installation)
eppur_se_muova is no armchair/keyboard "expert" but someone who knows science, and clearly grasps the concepts in play here as well as anyone.
Many seem unable to grasp the concept of renewable energy producing hydrogen for free after the equipment is paid for.
Solar power could create the hydrogen to power a home hydrogen station, like the experimental Honda project-

Honda has long been conducting research into hydrogen production and supply systems for a hydrogen-based society of the future. At the solar-powered water electrolyzing hydrogen station that has been operating on an experimental basis since 2001 at Honda R&D Americas in Torrance, California, employment of Hondas water electrolyzing module, which boasts world-leading efficiency, as well as next-generation solar cell panels made by Honda Engineering, has further improved hydrogen production efficiency and greatly reduced CO2 emissions during system manufacturing...
http://world.honda.com/FuelCell/FCX/station/
