[digitalscribe]

The article is perfectly clear that all the values are watts (MW, GW).

It's really silly to assume that the literal Energy Information Administration doesn't know the difference between the units of watts and watt-hours.

Battery power capacity is watts.

Battery energy capacity is watt-hours.

This article is talking about power capacity.

[bee_rider]

I think you are right.

It is a little confusing because they use the term “battery storage capacity” a bunch of times. This looks like the… amount of storage capacity that the batteries have. But I think they actually mean it as, like, (battery storage) capacity. Like battery storage is just the name of the type of thing that provides [power] capacity.