I see a lot of posts about how hydrogen is 'inefficient.'

It's important to specify what process we're talking about.

Production of hydrogen through electrolysis has an energy efficiency of ~80-90%.

If you burn that hydrogen in a gas turbine, that process is ~40-60% efficient.

Jesse Peltan I mostly agree, but 'If you have a use for that heat' is a hell of an 'if'. Are people using CCNG waste heat for anything? If not, they're not going to use CC hydrogen waste heat. I've seen that 'if' SO many times for vaporware projects.

nebulousmenace (Sandy B.) Agreed. We have a ton of unused waste heat because it’s often generated far away from demand.

Integrated industrial parks can use waste heat. We see a lot of that in China with coal plants.

Jesse Peltan nebulousmenace (Sandy B.) I want me some co-located industrial parks!

Drew Felker Jesse Peltan nebulousmenace (Sandy B.) Every rubber factory in England has a food factory within 500m. Rubber making has waste heat.
Making food needs heat!