Residential Energy Efficient Property Credit: This tax credit helps taxpayers pay for qualified residential alternative energy equipment, such as solar hot water heaters, solar electricity equipment and wind turbines. The credit, which runs through 2016, is 30 percent of the cost of qualified property. There is no cap on the amount of credit available, except for fuel cell property. Generally, you may include labor costs when figuring the credit and you can carry forward any unused portions of this credit. Qualifying equipment must have been installed on or in connection with your home located in the United States; fuel cell property qualifies only when installed on or in connection with your main home located in the United States.