General Motors and Honda Motor Co. announced this week that they're joining forces to develop hydrogen-powered cars.

Both companies were previously competing against one another in the race to develop hydrogen fuel-cell technology that produces cars which only emits water vapor.

"Among all zero CO2 emission technologies, fuel-cell electric vehicles have a definitive advantage with range and refueling time that is as good as conventional gasoline cars," Honda President Takanobu Ito said in a press statement.

GM revealed a number of hydrogen-cell concept models the last decade or so before switching their focus to electric vehicles like the Chevy Volt. GM currently holds the most patents involving battery chemistry, and Honda, which knows how to produce a hydrogen fuel-cell vehicle, is in a close second place.

Click here to read about Tokyo's fuel-cell car.

Neither company was getting anywhere however, so they will now combine to produce a power plant, which is usually produced from natural gas, powered by hydrogen according to USA Today.

"This collaboration builds upon Honda and GM's strengths as leaders in hydrogen fuel cell technology," said GM CEO Dan Akerson, in a press statement. "We are convinced this is the best way to develop this important technology."

Both companies said that they're pushing to deliver a successful hydrogen-powered vehicle to dealerships by no later than 2020.

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