The guy running the company is an Excel nerd, just like me. He had his own spreadsheet, approaching the data from a different direction. The key number is the Years to Amortization, we differ by about half a year. He says 5.22 years, I say 5.78 years. He does not factor in the capital gains loss on the investment, preferring to look at the electric bill savings as a return on investment, which is probably a more correct way of doing it. I dunno, I'm not an accountant, but looking at it his way the return is something like 15% annual. Anyway, if I set my capital gains loss to zero, my amortization time changes to 5.23 years against his 5.22, so I'd say we're on the same page there, less than .2% difference.

tanstaafl.