A 'classic' new technology that comes up every few years. They often try and say how it can be used 'efficiently' but it's hard to see it ever working. Could

A 'classic' new technology that comes up every few years. They often try and say how it can be used 'efficiently' but it's hard to see it ever working. Could you really install it on roads at the cost of billions just so you can turn car petrol power to energy at peak times? Were is it going to be useful in remote areas compared to just shoving up a solar panel? Walked on every day vs a solar panel which is never trod on? Which is going to last longer?