The grid’s limitations are putting a damper on such projects. Gabriel Alonso, chief development officer of Horizon Wind Energy, the company that operates Maple Ridge, said in parts of Wyoming, a turbine could make 50 percent more electricity than the identical model built in New York or Texas.

“The windiest sites have not been built, because there is no way to move that electricity from there to the load centres,” he said.

The basic problem is that many transmission lines, and the connections between them, are simply too small for the amount of power companies would like to squeeze through them. The difficulty is most acute for long-distance transmission, but shows up at times even over distances of a few hundred miles.

Transmission lines carrying power away from the Maple Ridge farm, near Lowville, NY, have sometimes become so congested that the company’s only choice is to shut down — or pay fees for the privilege of continuing to pump power into the lines.

Politicians in Washington have long known about the grid’s limitations but have made scant headway in solving them. They are reluctant to trample the prerogatives of state governments, which have traditionally exercised authority over the grid and have little incentive to push improvements that would benefit neighboring states.