Discovery’s Planet Green blog has posted some interesting facts about alternative energy that I thought the readers of green-yourself would like. Enjoy:
- 600%: The highest average efficiency of a ground source heat pump in the winter, compared to 250 percent for air-source pumps.
- 15: Percentage of the average household electricity bill that goes toward lighting alone.
- 9: Lowest wind speed (in miles per hour) from which it’s efficient to harness wind power.
- 750: Number of electricity providers that offer a green alternative.
- 280,475: Number of photovoltaic cells shipped domestically in 2007.
- 7: Percent of energy that came from renewable sources in 2007.
- 53: Percent of that renewable energy that was drawn from biomass fuels, the largest supplier, followed by hydroelectric (36%); solar, geothermal, and wind energy all contributed 5% or less.
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