When going through the Home Energy Credit section you are asked about Entering any Fuel Cell Property Improvements. If you do not have a fuel cell property you should have left cost and the kilowatt capacity boxes blank (empty) and Continued.
Go back through the Home Energy Credits section and check your answers
To enter Home Energy Credits -
Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credit
Click on I'll choose what I work on (if shown)
Under Your Home
On Home Energy Credits, click the start or update button