SolarCity provides homeowners, businesses and government organizations cleaner, more affordable alternatives to their utility bills-we call this Better Energy. Our long-term relationships with customers allow us to provide them clean distributed energy, as a result of the demand for Better Energy we have installed more solar energy systems than any other company in the United States. SolarCity currently serves thousands of communities in 16 states, and customers include tens of thousands of homeowners, hundreds of schools and universities, leading commercial entities such as Walmart, eBay and Intel, and major government organizations such as the U.S. Military. Approximately 21% of our new residential solar energy system customers in 2011 purchased additional energy products or services from us, and as our customers' energy needs evolve over time, we believe we are well-positioned to be their distributed energy provider of choice.
Rising retail electricity prices, coupled with inelastic demand, has created a significant and growing market opportunity for cleaner, cheaper energy. Our team of highly skilled in-house professionals are dedicated to delivering the highest engineering standards, overall quality and customer service. Our top priority is to provide value and quality service to our customers. In addition to clean distributed energy, we are able to provide our customers with a range of additional services, including energy efficiency evaluations and upgrades, electric vehicle charging services, advanced energy monitoring software and battery storage solutions.