I would guess it's diesel as that's what most MW scale generators for data centers use.
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I saw a previous article that said it was methane.
Why would a data center be running off its back up generators 24/7?
I've been following this closely. MLGW does not have capacity in the grid to power the data center, which would take like 60% of an already strained power grid. Their solution was to install 35 dirty methane power generators. Probably because Musk already has the ability to produce methane for SpaceX. It's been absolutely awful, the smog has been extreme and nobody wants these generators to be here. This was Musk solution because they didn't want to pay to upgrade the Memphis power grid.
Got the impression that he needed his own power station for this data centre. Must be a grid shortage or he has a cheap fuel deal.
To dodge code restrictions.
If theyre not 'permanent' and installed, environmental protections and taxes dont apply.