A study by the Pew Charitable Trusts shows North Dakota continues to be a national leader in wind power development.
The study says that between 2009 and 2013 -- $1.8 billion was invested by private companies in wind farms and other clean energy technologies.
"With so much emphasis on the oil production and all that good news, we sometimes lose sight that there's another leg of this energy stool in North Dakota," said North Dakota Association of Rural Electric Cooperatives executive vice-president Dennis Hill. "That's the renewable energy sector."