Renewable resources are those resources of the planet that can be restored by natural means. For example wind, sunlight, tides, geothermal heat. It is worth noting that these sources are called renewable, based on the scale of human time. After all, even the sun will stop shining one day, but it will happen only in a few billion years.
Today there are more than 20 countries, the share of renewable energy sources in the total energy balance of which exceeds 20 %. Among them: Iceland, Norway, Scotland, Denmark, Germany, and others. There are also countries with a 100th share of renewable energy sources.
Renewable energy sources can be used both on an industrial scale throughout the country and in some rural regions.There are a loy of about renewable energy information in this site. For example;
The energy sector that converts water energy into electricity is called hydropower.
There are several types of water energy sources:
- River energy
- Wave power
- Tidal energy
The most common way to generate electricity from water is the construction of hydroelectric power plants. To do this, dams are built on the rivers, which accumulate water, after which it is discharged to the turbines associated with the electric generator. Hydropower accounts for 32 % of the world’s electricity production, and hydropower plants are located in 150 countries.
What is Biomass energy?
Biomass is another type of renewable energy. Biomass is the biological material left over from living plants and organisms. It can be converted into electricity by burning. As thermal and biochemical methods of biomass produced biofuel, this can be used, for example, for refueling cars.
The source of biomass is usually trees, reeds, millet, hemp, and other crops.
The use of biomass for power generation is widespread in Southeast Asia, the USA, and Great Britain.
Wind can be used to rotate wind turbines. Turbine power can be from several kW to 5 MW. The most common steel turbine capacity starts from 1.5 to 3 MW. Wind power is developed in countries with high winds, for example, in Norway, where a third of the country’s electricity is thus obtained. On average, the share of wind power grows by 30% every year.
Windmills are also installed in the ocean, where wind power is usually higher due to the lack of barriers.
Solar energy can be directly converted into electricity using solar panels. Or used to heat water, the resulting steam drives the turbine. Sunlight can get directly to the solar panels, or pre-concentrate using lenses.
Solar energy can be used for artificial photosynthesis. This is when as a result of the action of the sun, there is a splitting of water into oxygen and hydrogen.
At the moment, the greatest obstacle to the development of solar energy is the high price of solar panels. Scientists continue to search for new materials that can reduce the price of solar panels.
Our earth is a huge source of heat energy. This energy comes from the nucleus and is also the result of the decay of organic substances. Water heated in the bowels of the earth can be used to heat homes or converted into electricity.
Although the whole earth is a source of energy, it can be extracted only in some places that are on the boundaries of tectonic plates. Geothermal energy is used by such countries: Iceland, USA, and China.