[Faaak]

Maybe they meant "gigawatt-hours per day"

[Etheryte]

Gigawatt hours per day is just gigawatt hours per 24 hours, so just gigawatts but divided.

[protomolecule]

Which gives you power again, not work. "gigawatt-hours per day" = gigawatt/24

[stephen_g]

If you consider that watt hours is just a convenience unit for (3600) joules, then “1 gigawatt hour each day” correctly should be “3600 GJ/day” which works.

[geon]

Which is a reasonable metric.

[protomolecule]

Expressed in an unreasonable way.