Chamillionaire certainly wasn't referring to the Toyota Avalon or Camry when he rapped about "ridin' dirty" but maybe he'll change his tune soon. That's because some of the future energy sources for the Kentucky factory that makes those two models will come from gas created from the breakdown of solid waste. So the power behind some of the production at Toyota's largest North American factory will indeed be funky.

Toyota is working with Waste Services of the Bluegrass to build a network of wells at a nearby landfill in order to collect the gases. Construction of the system starts next month and will be finished by early next year. The upshot is that the system will produce one megawatt of electricity per hour, which is the equivalent to the power used by 800 houses. Last spring, Toyota said it would start producing the Lexus ES at the Kentucky plant after getting almost a $150 million offer from the state. That's because that model is expected to add 50,000 vehicles to the existing production numbers at the plant. And those production numbers are already large, as Toyota makes both the standard and hybrid versions of both the Camry and Avalon there.

Mind you, Toyota's not the first to go this route for factory-energy production. In 2011, General Motors' Orion Assembly Plant started getting about 40 percent of its energy for production of models such as the Chevy Sonic and Buick Verano from methane captured from a landfill nearby. The General estimated at the time that the process would cut the company's energy costs by about $1.1 million a year. Check out Toyota's press release about the Kentucky plant and its future landfill gas below.