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Lighting upgrade math: for any number of lamps swapped from incandescent, halogen or CFL to LED, the annual energy and cost saved from the wattage drop at your hours per day and electricity price, the replacement-bulb sa...
Find the cost of devices that draw power while off or idle: each device with its standby watts, count and hours in standby per day gives the annual energy, the cost at your electricity price, the carbon emitted, the shar...
Renewable share of US electricity generation from the EIA grid monitor: solar, wind, hydro and geothermal as a percentage of the latest hourly generation total, by grid region. Source: U.S. Energy Information Administrat...