 In 2010, SolarCity acquired Building Solutions, a home energy audit firm, and began to offer energy efficiency evaluations and upgrades.SolarCity worked with Admiral's Bank of Boston in March 2012 to make a new loan available to finance energy efficiency improvements and expanded its energy efficiency services to the East Coast.SolarStrong was SolarCity's 5-year plan to build more than $1 billion in solar photovoltaic projects for privatized military housing communities across the United States.