Energy Information Administration-                                         www.eia.doe.gov/

                               Federal Residential Energy Tax Credit-                          http://www.irs.gov/pub/irs-pdf/f5695.pdf

                                Depreciation ans Section 179 Expense-              http://www.irs.gov/formspubs/article/0,,id=109879,00.html

                                                     Amendment 37-                  http://www.dsireusa.org/documents/Incentives/CO26R.htm