Renewable energy is growing rapidly in this country. The wind and solar industries are enjoying double-digit growth each year. Part of that is thanks to homeowners who install solar panels. With tax credits and subsidies, it's been possible to make a financial argument for installing them, but in recent years, the price of one fossil fuel - natural gas - has declined so much that even with extra help, solar panels are having difficulty competing. NPR's Jeff Brady reports. You've probably heard about hydraulic fracturing. Fracking is a controversial drilling technology that some worry is harming the environment. But since 2005, it's also led to a nearly 30% increase in the amount of natural gas produced in the U.S. "We've got a classic situation of supply and demand." Kathryn Klaber heads an industry group near Pittsburgh called the Marcellus Shale Coalition. Natural gas demand has not gone up as quickly as supply, and Klaber says the price has dropped. "A handful of years ago, natural gas could've been in the order of, you know, $12, 13, 14. We're now down to three to four. And that has had a direct impact on consumers."