After market close yesterday, SolarCity revealed in a SEC filling that it expects Elon Musk’s rocket company to buy $90 million of the $105 million in new Solar Bonds issued. Last year, SpaceX already purchased solar bonds from SolarCity on two separate occasions: another $90 million followed by $75 million. SpaceX’s involvement in SolarCity’s Solar Bond Program is set to total around $255 million, which should help finance a lot of solar installations.