There are two main buying options available in the market: - OPEX Model –The OPEX (Operating Expenses) model, also known as the Renewable Energy Service Company (RESCO) model, is a financing and ownership structure commonly used in the renewable energy industry, including solar projects. Under this model, the developer or a third-party company owns and operates the solar project, while the consumer or end-user only pays for the energy generated by the system. CAPEX model – The CAPEX (capital expenditure) model is a financing approach in which consumers or businesses bear the entire upfront cost of a project or investment. In the context of installing a rooftop solar system, the CAPEX model requires the consumer to cover all the capital expenses associated with the project. These are the primary components of a solar power system, although there may be additional components or accessories depending on the specific configuration, requirements, and optional features of the system.