Lennar (LEN) and other companies have recently been trying to make it easier and cheaper for homeowners to generate electricity from the sun, chipping away at the utilities’ monopolies. As a result, the number of residential solar installations has climbed, aided by their declining cost and government incentives. Per the Wall Street Journal:  

Such systems are less expensive to install during a house’s construction than afterward, while some builders offer the cheaper option to lease a system rather than buy one.

“We aren’t offering homes with solar as an option—it’s a standard feature” in certain communities, said David Kaiserman, president of Lennar Ventures, which oversees the builder’s solar project.