Found that in the Sunday Business section of the Star Ledger.

From that article....Payback projections by states

NJ (With rebates).......2.8 years
NJ (Without rebates)....4.2 years
Ca......................6.7 years
La......................7.6 years
Tx......................10.0 years
NM......................10.3 years
Ga......................18.5 years

Calcs are attributed to our high energy costs, progressive clean energy laws. And some creative financial methods by a few companies.

Source credited with above info is 'One Block off the grid'

I'm looking for a link to the whole article, or i'll try to have it scanned.
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John