Part of the Drax Group (suppliers of low-carbon energy), Haven Power is a business utility suitable for users over 50,000 kWh of electricity each year.
generation utility iot platform VPP
Energy co-op - The first co-operatively owned wind farm to supply its owners with their own green electricity via the grid
Amp Energy Canadian, assets behind and in front of the meter, backers of Faraday Grid (see above)
Smartest Energy they have an interesting periodic report in mailing list
Smarter business energy broker for business
Tonik UK utility with 100% renewable electricity, 10% green gas and 90% carbon offset
Octopus London based aggregator, green easy to switch energy, there is probably a link with reactive-technologies that I haven’t understood
Trust power another solar / wind energy company to be launched soon
OVO energy provider pledging to provide sustainable power and smart devices for heating optimisation, monitoring, etc.
EDF DSR has a solution for demand side response
Limejump - Assets managers / demand side response platform / battery and other devices
Flexitricity direct Limejump competitors, monetise energy flexibility. I.e. an energy company that enables the balancing mechanism (check this link on elexon)
Ecotricity founder Dale Vince on wiki is worth checking out