Solar Electric Property
Enter the total cost of solar electric property on line 15.
Solar Water-Heating Property
Enter the total cost of solar water-heating property on line 16.
Fuel Cell Property
Enter the total cost of fuel-cell property on line 22. On line 23 multiply by .30. On line 24 enter the kilowatt capacity and multiply by $1,000. Enter the smaller of line 22 or 24 on line 25.
Enter the total cost of wind energy property on line 17.
Geothermal Heat Pumps
Enter the total cost of geothermal heat pumps on line 18. Add lines 15 through 18 and enter on line 19. Multiply that number by 0.30 on line 20. Add lines 20, 25 and 26 and enter on line 27.
Figuring the Credit
Enter the smaller of line 27 or 30 on line 31 and enter this amount on line 52 of your form 1040. If line 31 is less than line 27, subtract 27 from 31 and enter the amount on line 32. You can carry this remaining credit amount forward to next year's taxes.