Commercial roof space can currently show an IRR of between 12% and 18%, dependent on location and grid costs.

One of three funding routes is normally taken:

  • Direct capital investment
  • “Free” system with PPA (power purchase agreement) where surplus power is sold to the tenant at a competitive rate
  • Loan from renewables funding specialist.

Financial models for solar - image PS-logo-bar-2017 on http://www.powersun.ltd.uk