The problem is exactly as in title. I updated my game 2 days ago to version HBM-NTM-.1.0.27_X4936 and my concrete production has stopped once I started the game again. Stirling generator seem to run just fine. I tried many times disconnecting the cable and connecting it again but energy was not being exported from Stirling generator

My suggestion: rollback the version, everything concerning power transfer is very unstable now. And there wasn't much that has been added in the recent 2 updates except for the second power system that's pretty much unusable.

Stirling generators were broken, they didn't output energy into cables at all. Should be fixed with the most recent version.