* As discussed before, innovative financial models like "solar leasing" are a driving force behind the exponential growth of rooftop solar energy. With solar leasing, home-owners get a solar system at no up-front costs and sign a 20-year lease where the energy savings offset the monthly lease payment. * Some companies feel that not only home "owners", but also "tenants" of homes should be able to "go solar". * Last week, a company in the UK secured a lb10.1 million investment which will provide thousands of social housing tenants in the north...