Are solar panels worth it?

He goes through the numbers in detail, and shows that at the price he paid, and with the "tiers" of rates he pays for electricity, he will recoup his initial investment (after 30% government rebate) in 8 years, but at the current price of solar panels that has now dropped to 3 years. And he says that trend on time to recoup investment is continuing to get shorter, both as the cost of solar panels goes down and the cost of electricity continues to steadily climb by (a mandated maximum of) 8% a year. (Also, the efficiency of solar panels continues to increase.)