Microsoft, AWS, Equinix join list of companies pausing data center projects

The island of Ireland has its own grid, with limited interconnection to the UK grid. us-east-1 is within a much larger grid (the eastern interconnection) which also has more robust interconnection with other major grids. There's a lot more flexibility in connecting new large customers in a larger grid, because there's a tendancy to build towards a percentage over capacity, and a 1MW load is a smaller percent of a larger grid.

That said, a 1MW load is still a lot, so the local transmission utility may not always be able to accomodate it in any particular location, but it should be possible to find somewhere nearby-ish where there's capacity.

AFAIK the biggest constraints for virtually all DCs is available power and available fibre connectivity (or in the case of places like Singapore, available land).

There was an article[0] recently about just that thing. In this case the issue is overhead line capacity in the area by us-east-1 rather than generator capacity.

0: https://www.datacenterdynamics.com/en/news/dominion-energy-a...