This fact sheet outlines a 6-step process to help organizations select a financing mechanism for onsite energy generation, storage, and/or energy efficiency projects. They offer whole project funding, including solar, battery storage, and roof work — with no fees, no appraisals, and no home equity requirements. However, they're faced with interest rates that are significantly higher than they were just a. . The initial cost of an energy storage system can be high, but homeowners can take advantage of several financial incentives and rebates to make the system more affordable. These incentives come from federal, state, and local governments, as well as utility companies.