I wish there was a link to the article and sources on the prices.
"while natural gas-based electricity cost $82 in North and South America."
This makes no sense – the price of NG is very local.
I just ran an analysis of NYISO Zone J (New York City's) average hourly price for the last year – and it comes out at an average of $40.87 per MWh(peak and off peak). This would include all sources of generation.
The prices in the article would have everyone generating electricity loosing massive amounts of money – which they aren't.
I read a summary of some recent research at Stanford - concluding that wind was more than competitive with oil. That article mentioned that there were hidden subsidies to many energy sources, including oil and gas, and that most analysis didn't take those into account.
Here [1] is the official press release. However, I don't think the full report is available as a free download.
[1] http://about.bnef.com/press-releases/wind-solar-boost-cost-c...