The "tipping point" will arrive when the capital cost of solar power falls below $1 (51p) per watt, roughly the cost of carbon power. We are not there yet. The

The "tipping point" will arrive when the capital cost of solar power falls below $1 (51p) per watt, roughly the cost of carbon power. We are not there yet. The best options today vary from $3 to $4 per watt - down from $100 in the late 1970s. Nanosolar is "the first solar manufacturer capable of profitably selling solar panels at as little as $.99/Watt" (http://www.nanosolar.com/blog3/2007/12/18/nanosolar-ships-first-panels http://www.nanosolar.com/blog3/2007/12/18/nanosolar-ships-fi...) edit: after the post, I remembered that the cost of a solar panel is only about half the total cost of solar power.