I joined Bulb from EDF as the price plan was cheaper at Bulb and from renewable sources (however, as this is the national grid, that doesn’t make much sense).
Since that time (roughly 3 months ago) I have had 3 price increases, taking my bill to higher than it was with EDF. In addition, I am bombarded with emails about getting a smart meter fitted. Seems that saying no isn’t enough.
All in all, it’s very disappointing and not something I would recommend. I would recommend that you switch companies yearly, to ensure you are getting the best deal though.