Ian Stirling wrote:
What's the new long pole in the tent, if it's not fuel cell supplies?
Boiloff rates for fuel cell fuels?
Can the fuel cells be turned completly off, or is this just something to
power the shuttle when the station is in light?


My guess is to allow the fuel cells to run in absolutely minimal mode
but still run. This way it greatly extends supplies of gases.

Extending missions won't allow NASA to reduce number of flights needed
to complete the station though.