Rapid deployment of renewable energy and energy efficiency, and technological diversification of energy sources, would result in significant energy security and economic benefits. Renewable energy resources and significant opportunities for energy efficiency exist over wide geographical areas, in contrast to other energy sources, which are concentrated in a limited number of countries. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen derived from renewable resources. In its various forms, it derives directly from the sun, or from heat generated deep within the earth. Renewable energy is derived from natural processes that are replenished constantly. Renewable energy flows involve natural phenomena such as sunlight, wind, tides, plant growth, and geothermal heat, as the International Energy Agency explains: PlanetSolar, the world's largest solar-powered boat and the first ever solar electric vehicle to circumnavigate the globe (in 2012) 10.2 Conservation areas, recycling and rare-earth elements.In 2021, Norway, known for its production of hydroelectricity, consumed hydro energy worth 45% of its total energy supply. In 2021, China accounted for almost half of the increase in renewable electricity.
In addition, electrification with renewable energy is more efficient and therefore leads to significant reductions in primary energy requirements.
As most of the renewable energy technologies provide electricity, renewable energy is often deployed together with further electrification, which has several benefits: electricity can be converted to heat, can be converted into mechanical energy with high efficiency, and is clean at the point of consumption. Renewable energy technology projects are typically large-scale, but they are also suited to rural and remote areas and developing countries, where energy is often crucial in human development. In international public opinion surveys there is strong support for promoting renewable sources such as solar power and wind power. However renewables are being hindered by hundreds of billions of dollars of fossil fuel subsidies. Deployment of renewable energy and energy efficiency technologies is resulting in significant energy security, climate change mitigation, and economic benefits. Renewable energy resources exist over wide geographical areas, in contrast to fossil fuels, which are concentrated in a limited number of countries. Ī few countries generate all their electricity using renewable energy. National renewable energy markets are projected to continue to grow strongly in the 2020s and beyond. Many nations around the world already have renewable energy contributing more than 20% of their energy supply, with some generating over half their electricity from renewables. In most countries, photovoltaic solar or onshore wind are the cheapest new-build electricity. Renewable energy systems are rapidly becoming more efficient and cheaper and their share of total energy consumption is increasing, with a large majority of worldwide newly installed electricity capacity being renewable. Globally there are over 10 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer.
Over 4% of energy consumption is heat energy from modern renewables, such as solar water heating, and over 6% electricity. About 8% of energy consumption is traditional biomass, but this is declining. About 20% of humans' global energy consumption is renewables, including almost 30% of electricity.
Renewable energy often provides energy in four important areas: electricity generation, air and water heating/ cooling, transportation, and rural (off-grid) energy services. For example, some biomass sources are considered unsustainable at current rates of exploitation. Although most renewable energy sources are sustainable, some are not. Renewable energy stands in contrast to fossil fuels, which are being used far more quickly than they are being replenished. It includes sources such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy is energy that is collected from renewable resources that are naturally replenished on a human timescale.
0 kommentar(er)
