Ah, thanks for the correction, I didn't realize that. Still seems like it's not a bad way to generate electricity though.
I looked up the numbers, in the US, it’s something like 70% burn on-site for electricity, 20% burn in some nearby use (e.g. process steam or greenhouse warming) and 10% was cleaned up enough to pipe into the natural gas grid.
That’s by facility count, not BTUs.