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U.S. scientists have achieved a net energy gain in a nuclear fusion reaction for a second time—this time, with a higher energy yield, according to .

What’s going on: The federal Lawrence Livermore National Laboratory in California announced Sunday that in an experiment on July 30, a fusion reaction produced more energy than it consumed, and more than a similar experiment produced last December.

• The December reaction used 192 lasers to produce a net gain of 1.1 megajoules of fusion energy, enough to power an average-size home for about half an hour, according to .
• The July reaction is said to have netted even more, though specific figures for it are not yet available.

Why it’s important: “Scientists have worked for decades to develop nuclear fusion as a source of effectively limitless clean energy,” Axios reports.

• However … “Scaling up the technology to support the electrical grid will require increasingly powerful lasers—and more of them,” according to Extreme Tech.

The last word: “The net gain of fusion energy—for a second time, and in a larger amount—is a tremendous milestone,” said 17�Թ����� Director of Domestic Economic Policy Brandon Farris. “It is further evidence of the enormous potential of nuclear power to help us meet our energy needs and energy-security goals.”