ROSEBUD, S.D. -- The wind blows incessantly here in the high plains; screen doors do not last. Wind is to South Dakota what forests are to Maine or beaches are to Florida: a natural bounty and a valuable inheritance.

Rodney M. Bordeaux, the Rosebud Sioux tribal council president, said that with the proposed 30-megawatt wind farm, "We can become a major player in wind in South Dakota."

Native American tribes like the Rosebud Sioux now seek to claim that inheritance. If they succeed in building turbine farms to harness some of the country's strongest and most reliable winds, tribal officials like Ken Haukaas believe, they could create a new economic underpinning for the 29,000 tribal members whose per capita annual income is about $7,700, less than a third the national average.

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In 2003, after erecting a 750-kilowatt turbine that powers the Rosebud Casino near the Nebraska border, the Rosebud Sioux tribal council set its sights on building the Owl Feather War Bonnet wind farm, a 30-megawatt project that could power about 12,000 homes, each about 1,200 square feet.

After five years of negotiations with a non-Indian developer, Distributed Generation Systems Inc. of Colorado, the tribal council president, Rodney M. Bordeaux, said Thursday that he expected to sign a construction deal that would bring in some $5 million to the tribe over 20 years. The total is about $1.7 million less than the developer's original offer because of an acrimonious last-minute dispute with the tribe.