That is when using propane for electricity.

I think there is a lot more value in burning propane for heating houses. Especially in places (like Europe where I live) that are already build to use gas for heating.

Especially if you consider the massive gas-storage facilities that are common here. We have 12 billion cubic meters of gas-storage here in the Netherlands, on a yearly consumption of 40 billion. That means we could use 'green propane' to load-shift about 30% of our heating from winter to summer. That would be amazing.