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Comment Re:Idiot (Score 1) 350

On energy destiny: Electric engines are a lot more efficient then petrol engines. You do not need as much stored power to get the same amount of work done.

Tracking systems are expensive. Use a few more panels (with the money coming form the savings of not having a tracker) and you get the same amount of power.

Comment Re:Not the total cost! (Score 1) 421

Apparently a coal train can carry 11,000 tons. (used as weight reference only)

For every 100m that train rises you will store 2.7 MWh. (And you need 2km of rail above +100m and another 2km of rail below +0m)

For their claim of 16GWh you will need 12,000km of rail line for storage (although if you double the hill you half the amount)

365 Days of drinking Lo-Cal beer. = 1 Lite-year