Brookfield Asset Management, a giant Canadian investment firm, will receive so many subsidies for a New Hampshire wind farm that they are worth 46 percent to 80 percent of the $229 million price of the project, when measured in today’s dollars, according to analyses for The Times performed by Booz and two other two industry financial experts. (The wide range reflects a disagreement between the experts on the future price of electricity in New Hampshire.)

Richard Legault, the chief executive of Brookfield Renewable Power, the division that oversees the Granite Reliable project in New Hampshire, declined to discuss his profit expectations in detail, but said the project might not have happened without government assistance.

“When everything has come together, it is a good investment for Brookfield, it is no doubt,” Mr. Legault said. “We are quite happy with it.” (Brookfield is also the owner of the small park in Manhattan that is home to the Occupy Wall Street protesters.)

Even companies whose business has little to do with energy or finance, like the Internet giant Google, benefit from the public subsidies. Google has invested in several renewable energy projects, including a giant solar plant in the California desert and a wind farm in Oregon, in part to get federal tax breaks that it can use to offset its profits from Web advertising.

Industry executives and other supporters of the subsidies say that the public money was vital to the projects, in part because financing for renewable energy projects dried up during the recession. They also note that more traditional energy sectors, like oil and natural gas, get heavy subsidies of their own. For example, in the 2010 fiscal year, the oil and gas producers got federal tax breaks of $2.7 billion, according to an analysis by the Energy Information Administration.

“These programs just level the playing field for what oil and gas and nuclear industries have enjoyed for the last 50 years,” said Rhone Resch, president of Solar Energy Industries Association. “Do you have to provide more policy support and funding initially? Absolutely. But the result is more energy security, clean energy and domestic jobs.”

Michael E. Webber, associate director of the Center for International Energy and Environmental Policy at the University of Texas, Austin, said renewable energy subsidies were a worthy investment. “It is a form of corporate welfare that is consistent with other social goals like job creation, clean air and boosting a domestic source of energy,” he said.