@millihertz Following the references might lead to some other hits, but I'm skimming through the ones in the paper I linked... I'm not seeing a lot in terms of language implementation energy comparisons. Some related papers from references:

green-haskell.github.io/papers

people.rennes.inria.fr/Tomofum

eecis.udel.edu/~manotas/prepri

It seems mobile and Java pop up a lot, which I guess makes sense.