San Mateo, California-based SolarCity announced Monday it's working with Chicago-based Incapital to enable investors to buy $100 million in solar bonds through a network of more than 500 financial institutions nationwide. The initiative will help SolarCity continue to raise capital as it expands into new states and offers loans for solar customers. SolarCity has raised money through companies such as Google and financial institutions like Bank of America and Wells Fargo & Co.