You’re absolutely right and we’re always looking to find more independent generators to partner with to purchase all of their electricity output. To cover any shortfall from these generators, we purchase renewable electricity in the wholesale market with our fuel mix for Apr 2016 to Mar 2017 shown here: https://bulb.co.uk/energy/fuelmix
We’re predominantly powered by hydro-electricity (85%) and anaerobic digested gas combustion (15%), but always looking to diversify our fuel mix to different fuels.
Fun blog article last week about anaerobic digestion: https://bulb.co.uk/blog/how-a-giant-cows-stomach-can-boil-your-kettle
The blog does have some great information about our energy, so I’d advise having a browse around there too!
All the best, Rob