Using trains to store surplus renewable energy

[jjb1970]

If anybody ever tells you anything about an aeroplane which is so bloody complicated you can't understand it, take it from me: it's all balls

 

R.J.Mitchell

 

I think the same could be said about many things in life.

[Edwin_m]

This month's National Geographic has a piece on a proposed pumped storage scheme in a former coal mine in Germany.  Capacity is stated to be 150 million gallons which I make to be 0.7 million tonnes, but they propose to dig a new tunnel for the underground reservoir rather than using the existing mine workings.  Stated to be expensive, which I guess it would be compared to just linking two convenient lakes.