Depends what context. For environmental reasons it'd be a negligible impact, but every bit counts. From a business like Masters Coffee Chill probably a nice little boost to productivity by swapping ongoing electricity costs for a one time capital allocation and 25% the ongoing cost for brewing than before.

I suppose for matketing 'green'credentials its technically useful as well, but you'd not design a whole campaign around it otherwise you'd leave yourself open to credible allegations of greenwashing.