I've got that, a couple of subsidized Tesla Powerwalls where the deal is they get to draw up to 50% of the juice during high load times. It's a pretty reasonable deal. From the customer point of view it definitely can take the place of a generator, GMP is pretty fast about bringing power back up usually so a few PW2s is pretty good even without solar. And unlike a generator PWs don't have regular testing/maintenance/consumables/noise/pollution. On GMP's side though the big point is to offset having to buy very expensive peak load power. It's already saved them a ton of money, old press piece for example:

https://greenmountainpower.com/2018/07/24/whoa-heatwave-savi...

I'll be a little curious if usage patterns are different this summer with more people home, but it's worked out well for them under typical conditions when there are big spikes in the afternoon/evening as people get back and turn on AC or the like.

Hmm, good point.

I'm about to move to Vermont and Green Mountain Power will be my power utility. It's good to hear this!

I wish you the best. Vermont is beautiful, and a lovely place to call home.