How Green is Your Electricity

I’ve just read this article (The problem with Shell Energy’s ‘renewable’ promise | Good Energy) about how Shell Energy have greened First Utility’s power overnight simply by purchasing Renewable Energy Guarantees of Origin (REGOs) in the market, without buying the green power that they were originally attached to.

Does Bulb do the same to any degree or are you actually buying the underlying green power? Same question for the 100% green gas…