This massive 121-ton electric dump truck never uses more energy than it generates on its own - here's how that works

The green machine, in both eco-friendliness and paint scheme, entered service in April in Péry, Switzerland.

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The eDumper began life as a traditional, gas-guzzling dump truck, and the transformation was no small feat. Here's a human for size comparison.

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Fully loaded, it can transport 65 tons of mined rock downhill from the mountain. As it descends, its regenerative braking generates electricity.

Because it's unloaded at the bottom, and then drives back up the hill weighing less than the downhill run, the eDumper uses less electricity than it produces, according to the researchers behind the project.

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In addition to being the world's largest electric vehicle, researchers also broke the record for the world's largest battery, which weighs 4.5 tons

Those massive batteries power a new motor, which replaced the dump truck's original diesel engine.

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Eventually, all the component parts were assembled into the truck

And in April, the eDumper was revealed to the world

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The eDumper is expected to move some 300,000 tons of rock every year for the next decade. The researchers estimate that will save "up to 1,300 tons of CO2 and 500,000 liters of diesel " over 10 years.