NASA’s power-saving operation should keep three Voyager 2 instruments working for at least an extra year, extending measurements from interstellar space.
Voyager 2 cannot get a replacement power supply. Its engineers found more time by changing how the spacecraft uses the electricity it still has.
In an August 4 mission update, NASA said a power-conservation operation had succeeded. The work should allow the probe’s three remaining science instruments to operate for at least an additional year. Without it, another instrument would have had to be switched off before the end of 2026.
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Saving electricity without letting the spacecraft freeze
The team nicknamed the operation “Big Bang.” Engineers turned off selected powered devices and used lower-power alternatives while preserving enough warmth for the spacecraft to function.
Turning equipment off also removes heat. Engineers have to keep critical components warm enough to work while reserving electricity for communications and scientific measurements.
NASA reported that the two Voyager spacecraft each lose roughly four watts of available power a year. The August announcement described a plan to perform a similar change on Voyager 1 in the following months; it did not report that the second operation was already complete.
The power source works without sunlight
The probes use radioisotope thermoelectric generators. These turn heat from radioactive decay into electricity. NASA’s radioisotope power program explains that plutonium-238 supplies the heat, allowing missions to work where sunlight is weak or unavailable.
This is why the mission’s dwindling electrical budget is different from a rechargeable battery reaching the end of a daily charge. The source keeps producing heat, but the usable electrical output declines over time. Conserving power can extend operations; it cannot reset the generator to its launch condition.
A follow-up to a risky plan
CPG previously covered the proposed Voyager power-saving operation in May. The August update supplies the missing outcome for Voyager 2: NASA says the change worked.
According to the mission record, Voyager 2 launched on August 20, 1977, and entered interstellar space in November 2018. It passed its 49th launch anniversary in August 2026.
The extra observing time is valuable because the spacecraft measures its surroundings directly. Extending that record depends on a machine built in the 1970s remaining electrically and thermally stable. Each year’s loss of power leaves engineers with fewer options.
