The road, which opened in the Netherlands in November of last year, has produced more than 3,000 kilowatt-hours of energy — enough to power a single household for one year.

“If we translate this to an annual yield, we expect more than the 70kwh per square meter per year,” Sten de Wit, a spokesman for the project — dubbed SolaRoad — said. “We predicted [this] as an upper limit in the laboratory stage. We can therefore conclude that it was a successful first half year.” De Wit said in a statement that he didn’t “expect a yield as high as this so quickly.”

The 230-foot stretch of road, which is embedded with solar cells that are protected by two layers of safety glass, is built for bike traffic, a use that reflects the road’s environmentally-friendly message and the cycling-heavy culture of the Netherlands. However, the road could withstand heavier traffic if needed, according to one of the project’s developers.

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