KUMAGAYA, Japan -- With its towering furnaces and clanging conveyer belts carrying crushed rock, Taiheiyo Cement's factory looks like an Industrial Revolution relic. But it is actually a model of modern energy efficiency, harnessing its waste heat to generate much of its own electricity.

Engineers from China and elsewhere in Asia come to study its design, which has allowed the company to slash the amount of power it buys from the grid.

The plant is just one example of Japan's single-minded dedication to reducing energy use, a commitment that dates back to the oil shocks of the 1970s that shook this resource-poor nation.

Kawasaki Heavy Industries, which makes the waste heat generator at the cement factory in Kumagaya, started developing the technology in 1979. But the generators were too expensive to sell outside Japan while energy prices were low. But overseas orders took off three years ago, after energy prices began rising.

Since then, the company has sold 64 units, mainly through a joint venture in China.

"Japan rushed to embrace these technologies back in the 1980s," said Katsushi Sorida, head of the waste heat plant department at Kawasaki Plant Systems, a subsidiary that markets and installs the units. "Now the rest of the world is finally catching up."

Despite their gains industrially, the Japanese housing market seems completely unregulated.  Un-insulated plastic boxes with no heating system are the norm, and people rely on kerosene heaters in the distinctly cold winters.