U.S. lab says it repeated fusion energy feat — with higher yield

A group of U.S. scientists say they have repeated their landmark energy feat — a nuclear fusion reaction that produces more energy than is put into it. But this time, they say the experiment produced an even higher energy yield than one in December that got international attention for making a major step forward toward the long elusive goal of producing energy through fusion.

This second achievement by researchers at the federal Lawrence Livermore National Laboratory in California is another crucial step — albeit in a journey that may still take decades to complete — in the quest for an unlimited source of cheap and clean power. The successful effort was initially reported by the Financial Times on Sunday.

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