The Defense Advanced Research Projects Agency (DARPA) officially announced on June 16, 2026, a new program called Symphonee that seeks to convert radioactive decay from Cold War-era nuclear waste into electricity for up to a decade or more without refueling, according to a DARPA press release. Officials said the goal is to produce high-density power sources for military and remote applications by tapping into the millions of gallons of high-level waste left over from decades of weapons production.
The program represents a shift from treating nuclear waste solely as a long-term liability to viewing it as a potential energy asset. DARPA program managers stated that the initiative could reduce the volume of waste requiring permanent storage while providing off-grid power for sensors, communications, and space systems.
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