It's my understanding that any power generated gets sold back to the grid. In my case it would be about 5600 kwh. At $0.08 per kwh that means I'd save around $450 per year. That being said, it's likely that most of the electricity gets generated in the summer (least needed) and not nearly as much in the winter (most needed). So I'd have a large credit in the summer but would then have to buy electricity as normal in the winter.
This also assumes electricity prices stay the same - if they increase then the rate of return would also increase. Rate of return would also increase if the initial cost went down - at $6500 I could get about 7% return.
And FYI in case anyone is interested I noticed Enmax now accepts credit cards, so you can pay your monthly bill with a credit card and earn rewards on your card like any other purchase.
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