Hi @mi-nido!
We talk about it some in our Update on Chain selection. The tldr, is that we are committed to using something that isn’t proof-of-work (or at least in how it has been implemented so far).
DSNP also shifts a lot of the work off-chain to lower costs (in money in environmental terms). Some of that is described in Concept Series 02: Source-Dependent Messages and will be touched on by some more posts later this week. Shifting computation off-chain doesn’t always reduce energy consumption, but it is usually helpful.