Reactor construction continues to lag.

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Global nuclear power capacity grew by less than 2,000 megawatts in 2007, a figure equivalent to just one-tenth of the now wind power installed globally last year, reports the Worldwatch Institute, Washington, D.C. Global nuclear capacity stands at 372,000 megawatts, but ranks as the slowest-growing energy source--just 0.5% in 2007, compared to wind at 27%.

The U.S. saw no nuclear construction starts for the 29th straight year, though one reactor was restarted after a 22-year shutdown, and construction resumed on another reactor that had been stalled since 1988. While electric utilities submitted applications for seven new reactors, and government regulators expect more applications this year, industry officials are seeking addition Federal loan guarantees as a prerequisite to starting plant construction. The U.S. credit rating agency Moody's has cautioned that many utilities are underestimating the cost of new plants and that nuclear investment could damage their credit ratings.

By the end of last December, some 34 nuclear reactors were being built worldwide, 12 of which had been under construction for 20 years or more. Asia accounts for the most construction, with 20 new reactors currently under way. India and China each have six reactors under construction...