Structural analysis and energy consulting as a combination is available in some offices - e.g. Büro Rothenbacher (Ehingen), which is probably a bit too far from you.
You should be able to search through the engineering chamber of your federal state. Additional services/approvals are also occasionally listed there. Our structural engineer has also registered energy consulting, but recommended the one he uses for his own house… I think the topic has become so specialized that I would separate it.