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To be fair, booting the Cray would require a good sized power substation. The power bill would be... impressive.

The 1s used between 100kW and 150kW. So a small substation. The XMP used 200-300kW. The 2 used 150-200kW.

There was a YMP model (the EL) that could be power off normal mains (220v).

Energy efficient was different back then.