You can't, because that's not how it works. But a company that sells you clean power is required to spend your money on the energy sources you've chosen. And as more and more people use their buying power to choose greener electric power, more and more companies will invest in clean, renewable energy sources. If you want to reduce the impact your electricity use has on the environment, the worst choice you can make is no choice. By choosing cleaner power, you'll be sending a message to companies that they should invest more heavily in less polluting energy sources.
Power plants raise air, land and water quality issues.
Consumers who implement energy conservation measures in their homes and offices will recognize the dual benefits of reduced electricity bills and reduced environmental impacts. The generation of electric power produces more pollution than any other single industry in the United States. The electricity industry in the United States has begun a process of restructuring similar in some respects to that of the long-distance telephone industry. Similarly, electricity consumers have had no choice but to purchase their electricity from their regional utility and pay for whatever type of generating resources the utility chooses. States are now beginning to restructure the utility industry and increasingly will allow consumers to choose suppliers and, most importantly, to choose the source of their electricity.