I got a tour of the local hydrogen refueling station about a month ago durring an open house the local power company, APS, had at their solar generating facility. This is supposedly the station that has done the most hydrogen refuelings thus far. Their electrolyzer they said wasn't the newest or most efficient, but it takes about 80 kwh to crack and compress 1kg of hydrogen. They sell it for $2.50 a kg (local electric rate is about .10 a kwh so if you made it yourself it'd be $8.00 a kg). Then they said you get about 56kwh out of it (this is from memory, but I was paying attention). IIRC he said the newer more efficient electrolyzers can make a kg of H2 from about 60kwh. I'm not sure if that included the energy it takes to purify (probably distill) the city tap water or not though.
I hate to say it, but that just looks so horrible compared to my electric Saturn conversion which uses less than 200 watt-hours/mile out of the pack and less than 250 watt-hours/mile out of the outlet.
What was nice about the location is they also sell CNG and hydrogen CNG mixes, it's open to the public durring business hours and you can simply "pay at the pump" with a credit card unlike a lot of other alt fuel refueling places where you have to get their special card.
Here's what I could find about it:
http://www.aps.com/my_community/FutureFuels/FF_1.html
http://69.88.104.123/
They didn't allow us to take pictures unfortunately, but you see most of it in the pictures there.