alt Hacker NewsThe cost of putting dirt in a pile is $1-2/ton.
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cyberax • today at 2:18 AM
The biggest expense will be the pipework inside that pile. That you won't be able to service easily. And you'll also need a LOT of insulation around it to prevent heat from leaking out too quickly.
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so $36-72k for days of 1GW of power? Sounds pretty cheap to me ...