Figured you could pump oxygen into the gas-burning generator. I could reproduce by placing a gas burning generator next to the oxygen side of an electrolytic separator or use a gas pipe.

Modpack: FTB Horizons: Daybreaker (v1.0.2)
Crash log says Windows 8.1, but I'm using Windows 10
http://pastebin.com/TNpRfHci

Outdated version of mek, update.

yarp... outdated mek version... also, the crash log thing seems to be an issue with MS and their upgrade process to 10. I upgraded from 8.1 as well and it stills shows as running on 8.1 even after a reinstall.

That did it. Thanks guys.