But if the smaller and scalable technologies prove effective, they will establish valuable niche markets for themselves not just among the TVAs of the world but also among those local utilities and less developed countries that need a clean and continuous source of power.

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The Obama administration and most of Congress do not want to deter companies from expanding this source of clean power.

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As more governments look to civilian nuclear power as a source of clean electricity, tighter controls and other new schemes are needed to help stop would-be cheats or terrorists from exploiting or stealing some of the proliferation-prone technologies and materials for bomb-building.

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Meanwhile, whatever happens with nuclear energy, solar power remains the most dynamic, fastest-growing source of clean, renewable energy and, indeed, of any energy source.

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Among them: an agreement for the United States to assist China in improving its "clean coal technology" at its growing number of coal-fired power plans, a major source of greenhouse gas emissions.

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So what better time for Ocean Power Technologies, a company that aims to capture hydropower as a source of clean, renewable energy, to makes its U.S. stock market debut?

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