 General Motors is a sponsor of the Pecan Street demonstration and is supporting the project to learn the charging patterns of plug-in electric car owners, and to study how a residential fleet of electric vehicles might strain the electric grid if all owners try to charge them at the same, which is what the preliminary monitoring found when the plug-in cars return home in the evening., the community had nearly 60 Chevrolet Volt owners alone thanks to GM's commitment to match the federal government's rebate incentive, which halves the purchase price of the Volt.The state set a goal to have 50,000 electric or other clean vehicles on the road by 2020. , there were 30,701 battery-powered and plug-in electric cars registered in Washington.