Both quotations are easily sourced on google:  put in "reduced cost of solar power" and "reduced cost of wind power" and you will find thousands of sites addressing the issue.   "Less than 10 years ago, in 2008, the cost of a solar panel installation was $8.82 per watt. The solar industry today looks very different: in addition to solar panel efficiency increasing dramatically, solar panel producers have significantly improved their manufacturing processes. Solar installers, too, can deploy solar PV across the United States more efficiently now than they could ten years ago. The result: the price of solar has fallen by over 60 percent, to just $3.36/watt"

"The US wind industry has celebrated the 10th annual Global Wind Day this week by highlighting the 66% drop in the costs of wind-generated electricity." Both photovoltaic and wind turbine technologies are methods to convert "natural" energy to electrical energy, and the technology has improved significantly in recent years.  GaryCrum