North Dakota regulators say the state's wind power resources almost doubled in 2009.
Four major projects began operating. They're capable of generating about 547 megawatts.
North Dakota Public Service Commissioners Tony Clark and Kevin Cramer say the state's wind power capacity is now almost 1,200 megawatts.
Clark says at the start of the decade, North Dakota had almost no commercial wind power, even though it is considered a top state for wind energy.
Two new projects began operating this week. Basin Electric Power Cooperative has finished a 120-megawatt wind farm south of Minot. Iberdrola Renewables began operating a 149-megawatt development in Pierce County, north of Rugby in north-central North Dakota.