I like what you said: “my criteria for a new host included that it be low carbon, not store any data in the U.S., and do business in English. That’s a surprisingly difficult combination being that most English-speaking low carbon web hosts are in the U.S., using Californian solar energy to power their data centres.”

Ecotricity’s http://www.ecotricity.co.uk/about/our-progress/ has: “Ecotricity Progress Report 2007″ http://www.ecotricity.co.uk/about/our-progress/report-2007.pdf which has on page 12 of 16:

The chart shows that from April 05 to April 06 20% of our total energy supply was from New Energy and that it increased to just over 24% the next year (year ending April 07). Based on our current schedule we’re on course to make further big strides this year — we expect to hit 30% by April 2008.

It’s worth mentioning that this increase in our % of new green energy is against a background of customer numbers (and therefore amount of electricity supplied) growing strongly year on year. We’d have our work cut out just keeping our % of green steady with customer numbers growing like that. In fact we achieved an increase of 50% in green supply while our customer numbers quadrupled over the last four years – We’re pretty pleased with that.