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Energy Star (trademarked ENERGY STAR) is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. [4] The program provides information on the energy consumption of products and devices using different standardized methods. The Energy Star label [5] is found on more than ...
Germany has been called "the world's first major renewable energy economy". [3] [4] The share of renewable electricity rose from just 3.4% of gross electricity consumption in 1990, provided by conventional hydro, to exceed 10% by 2005 thanks to additional biomass and wind, and reaching 42.1% of consumption in 2019.
If the final energy delivered for consumption is E and the EROI equals R, then the net energy available is E-E/R. The percentage available energy is 100-100/R. For R>10 more than 90% is available but for R=2 only 50% and for R=1 none. This steep decline is known as the net energy cliff.
A 2015 study shows price/kWh dropping by 10% per year since 1980, and predicts that solar could contribute 20% of total electricity consumption by 2030, whereas the International Energy Agency predicts 16% by 2050.
A global energy crisis began in the aftermath of the COVID-19 pandemic in 2021, with much of the globe facing shortages and increased prices in oil, gas and electricity markets. The crisis was caused by a variety of economic factors, including the rapid post-pandemic economic rebound that outpaced energy supply, and escalated into a widespread ...
China alone had over 40% of the world's capacity by 2022. [3] Wind power is used on a commercial basis in more than half of all the countries of the world. [4] Denmark produced 55% of its electricity from wind in 2022, a larger share than any other country. Latvia's wind capacity grew by 75%, the largest percent increase in 2022.
World electric generation by country and source in 2022. This is a list of countries and dependencies by annual electricity production.China is the world's largest electricity producing country, followed by the United States and India.
Electric energy is most often measured either in joules (J), or in watt hours (W·h). [6] 1 W·s = 1 J. 1 W·h = 3,600 W·s = 3,600 J. 1 kWh = 3,600 kWs = 1,000 Wh = 3.6 million W·s = 3.6 million J. Electric and electronic devices consume electric energy to generate desired output (light, heat, motion, etc.). During operation, some part of the ...