It seems that a significant portion of the value proposition for financing or leasing solar systems is the electricity cost savings you will see. Most dealers seem to be estimating future cost increases for electricity from your utility in 5 to 5.5% range. Clearly they do this because it makes the financial picture look better, but are they realistic? I really can't find any source that would support these kind of increases. Numbers from http://EIA.gov are much more conservative. Any thoughts?