Apparently Gemma 4 (by deepmind) are very energy-efficient for their capabilities.
The post itself seems to recommend a company (neuralwatt.com) but it's unrelated to project wagtail (an open source CMS made with django) so I consider it legit, they're just vouching for this new approach that shows users their ecological footprint basically.
(Of course, running these at a homelab is possible. hence the relevance of this info for the community)