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While the House of Representatives approved a requirement last week that American utilities generate more of their power from renewable sources of energy, and the Senate will consider similar proposals over the summer, China imposed such a requirement almost two years ago.

This year China is on track to pass the United States as the world’s largest market for wind turbines — after doubling wind power capacity in each of the last four years. State-owned power companies are competing to see which can build solar plants fastest, though these projects are much smaller than the wind projects. And other green energy projects, like burning farm waste to generate electricity, are sprouting up.

This oasis town deep in the Gobi Desert along the famed Silk Road and the surrounding wilderness of beige sand dunes and vast gravel wastelands has become a center of China’s drive to lead the world in wind and solar energy.

A series of projects is under construction on the nearly lifeless plateau to the southeast of Dunhuang, including one of six immense wind power projects now being built around China, each with the capacity of more than 16 large coal-fired power plants.

Each of the six projects “totally dwarfs anything else, anywhere else in the world,” said Steve Sawyer, the secretary general of the Global Wind Energy Council, an industry group in Brussels.

Some top Chinese regulators even worry that Beijing’s mandates are pushing companies too far too fast. The companies may be deliberately underbidding for the right to build new projects and then planning to go back to the government later and demand compensation once the projects lose money.

That does not mean that China will become a green giant overnight. For one thing, Chinese power consumption is expected to rise steadily over the next decade as 720 million rural Chinese begin acquiring the air-conditioners and other power-hungry amenities already common among China’s 606 million city dwellers.

A big impetus was the government’s requirement, issued in September 2007, that large power companies generate at least 3 percent of their electricity by the end of 2010 from renewable sources. The calculation excludes hydroelectric power, which already accounts for 21 percent of Chinese power, and nuclear power, which accounts for 1.1 percent.

Chinese companies must generate 8 percent of their power from renewable sources other than hydroelectric by the end of 2020.

The House bill in the United States resembles China’s approach in imposing a renewable energy standard on large electricity providers. But the details make it hard to compare standards. The House bill requires large electricity providers in the United States to derive at least 15 percent of their energy by 2020 from a combination of energy savings and renewable energy — including hydroelectric dams built since 1992.

Chinese power companies are eager to invest in renewable energy not just because of the government’s mandates, but because they are flush with cash and state-owned banks are eager to lend them more money. And there are few regulatory hurdles.

The solar project still must go ahead, Mr. Zheng said, because China has limited coal reserves — 41 years at current rates of production — and the potential for hydroelectric power is leveling off as most eligible rivers have already been dammed.

But technical obstacles to renewable energy are popping up. Sandstorms in Dunhuang in the spring, for instance, will cover solar panels and render them useless until they are cleaned after each storm by squads of workers using feather brushes to avoid scratching the panels, a process expected to take two days.

And wind turbines are being built faster here than the national grid can erect high-voltage power lines to carry the electricity to cities elsewhere. On the windiest days, only half the power generated can be transmitted, said Min Deqing, a local renewable energy consultant.

Nonetheless, city officials are pushing for more projects.

Beijing would easily surpass current 2020 targets for the use of wind and solar power and was now contemplating targets that were more than three times higher.

In the current development plan, the goal for wind energy is 30 gigawatts. Zhang said the new goal could be 100GW by 2020.

That matches the European goal, and would represent a direct challenge to Europe's claims to world leadership in the field, despite China's relative poverty. Some experts have cast doubt on whether Britain will be able to reach 20%. On another front, China has the ambitious plan of installing 100m energy-efficient lightbulbs this year alone.

Beijing seeks to achieve these goals by directing a significant share of China's $590bn economic stimulus package to low-carbon investment. Of that total, more than $30bn will be spent directly on environmental projects and the reduction of greenhouse gas emissions.

But the indirect green share in the stimulus, in the form of investment in carbon-efficient transport and electricity transmission systems, would be far larger.

HSBC Global Research estimated the total green share could be over a third of the total package.

China also believes the price reforms that will take place in its economic recovery programme will lead to more efficient use of resources and an increased demand for renewable energy.