General Motors plans on having a fat growth margin for plug-in hybrid sales in 2013. Last year, GM sold roughly 30,000 Volts and Opel Ampera and according to an unnamed source, Bloomberg reports that the automaker plans to build 20 percent more this year .

This actually might be possible considering the same unnamed source said GM aims to build between 1,500 and 3,000 of the cars per month. Chevrolet sold 23,461 Volts in the U.S. last year, but sales were partially hindered by temporary production shutdowns last year.

“We had some on and off starts with the assembly plant,” GM small cars marketing director Cristi Landy said. “California, which is our strongest market, was selling great then they would have no products. They’ve run out of products probably three or four times in the last 12 months, it’s been very frustrating.”

Since the Volt was first released to the public, the sales battle has been an uphill one. Chevrolet has a lot of ground to cover considering the Volt was aimed at taking on Toyota’s behemoth, the Prius hybrid. Last year, Prius sales were 10 times greater than the Volts, however that was including the entire Prius family. Comparing these cars is also not fair because the Volt is still an industry fledgling beside the entrenched Prius. The best indicator that Volt sales more than tripled last year compared to 2011, which was it’s first year of sales.