SolarCity has raised $345m in tax equity from four separate partners in June and July to finance new solar projects.

The financing facilities cover the capital cost of new equipment and installations, and make it possible for customers to pay less for solar power than they pay for utility power.

In addition to the $345m in new funds, SolarCity also expanded its existing debt aggregation facility to $760m, an increase of $110m.

SolarCity added two new lenders to the facility, which accounted for $70m of the $110m upsize. SolarCity also expanded its solar renewable energy credit (SREC) financing facility to accept five years of hedged SRECs, significantly lowering its cost of financing for SRECs and drawing more capital from the facility.

SolarCity's capital markets team has raised more than $1.5bn in project financing to date in 2016. The company has now created funds and facilities to finance projects with more than 30 different banks and corporate partners. 

Investment in rooftop and other small-scale solar is expected to attract $3.4 trillion over the next 25 years.