This is a UK Government scheme which closed to new applications after 31st March 2019.
Previous applicants can find information on GOV.UK and Energy Saving Trust websites. You can find information about the upcoming Smart Export Guarantee on the Energy Saving Trust website.
Further information on administration of the scheme is available on the Ofgem website and the certification scheme is here Microgeneration Certification Scheme (MCS)
Page updated 9th July 2019