WASHINGTON — The Pentagon is funding technology to beam solar power from space to Earth, pursuing a potential source of electricity for military installations that depend on vulnerable fuel supply lines. Its latest investment backs Overview Energy, a Virginia startup developing satellites that would transmit energy to large solar arrays on the ground.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...