On 21/10/2012 09:30, Martin Brown wrote:
And if they electrolyse water to make hydrogen they will also have a
waste stream of oxygen that needs an application.

If (and it's a pretty big if) there's a significant oxygen outflow this
could be fed to a fossil fuel station (or for that matter any fuel
burning station) to increase the efficiency - you wouldn't need to heat
all that nitrogen.

If there isn't - well, releasing small quantities of oxygen is hardly a
major risk to the environment.

Andy