Unless they're talking about the second derivative of energy I suppose: "My energy accelerates at 11kWh per hour per hour!"

Which is not a thing anybody ever does. Oh wait, it matters for peaking power plants and Marx generators but there you'd use Joules/sec/sec rather than kWh/h/h.

Surely in that world you're mostly working with latency not some sort of "acceleration". 10 outfits who can each deliver 100MW in 5-10 seconds, does not give you 100MW in a second, it gives you 1GW in 5-10 seconds.