Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing cavitations, and increasing generation. Whereas older units had efficiency ratings as low as 60%, the new units have efficiency ratings of approximately 90%. The U.S. Department of Energy (DOE) also looked at new technologies for developing low-head, ultra low-head, and small hydropower projects. These technologies included the following: (more…)
Hydropower, also known as hydroelectric power, is the use of water to produce power. Harnessing water to perform work has been ...
The World Commission on Dams (WCD) was formed in 1998 by a joint initiative of the World Conservation Union (IUCN) and the Worl ...
The winners in hydropower and other large dam projects are those who gain electricity, domestic water supplies, sanitation, dro ...
The water levels of most of the world’s rivers fluctuate with seasonal rains, melting snows, or droughts, and in the arid zones ...
Hydraulic turbines have two main classifications: impulse and reaction. The impulse turbine generally uses the velocity of the wate ...
Hydropower, also known as hydroelectric power, is the use of water to produce power. Harnessing water to perform work has been going on for thousands of years. The Greeks used waterwheels for grinding wheat into flour more than 2000 years ago. Besides grinding flour, the power of the water was used to saw wood and to power textile mills and manufacturing plants. This article looks briefly at how hydropower plant began, why it is considered renewable energy technology, the parts of a hydropower plant, types of turbines and when they are used, and what research and development is occurring. (more…)
Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing c ...
The water levels of most of the world’s rivers fluctuate with seasonal rains, melting snows, or droughts, and in the arid zones ...
The World Commission on Dams (WCD) was formed in 1998 by a joint initiative of the World Conservation Union (IUCN) and the Worl ...
The winners in hydropower and other large dam projects are those who gain electricity, domestic water supplies, sanitation, dro ...
The demand for electric energy by a community varies with the time of day and with the time of year. An electric power utility ...
The World Commission on Dams (WCD) was formed in 1998 by a joint initiative of the World Conservation Union (IUCN) and the World Bank (WB) after a historic meeting of leading dam proponents and opponents in Switzerland, with proceedings reported by Dorcey and others. The WCD was asked to discover the truth about the hydropower energy facts, hydropower energy pros and cons, cost, effect, and benefit of large dams and it functioned independently for 2 years at a cost of $10 million. The money was well spent, and at the end of that period the WCD produced a comprehensive report and numerous support documents, and then dissolved itself. The report and support documents remain on the Internet available to all, and they have changed forever the debate about dams. (more…)
The water levels of most of the world’s rivers fluctuate with seasonal rains, melting snows, or droughts, and in the arid zones ...
Hydropower, also known as hydroelectric power, is the use of water to produce power. Harnessing water to perform work has been ...
The winners in hydropower and other large dam projects are those who gain electricity, domestic water supplies, sanitation, dro ...
Up to around 1980, hydropower research and development (R&D) efforts focused mainly on improving turbine efficiency, reducing c ...
Some of alternative fuel sources are by no means new. For centuries people have harnessed the power of running water for a vari ...
In Europe, modern renewable energy sources technologies were explored thoroughly for the first time after the oil embargo/ price crisis of 1973. Notably, market introduction of renewable energy technology started in about 1985, but the renewable energy sources industry has become vital only during the past decade. Accordingly, relevant statistical renewable energy sources data have been systematically compiled only over the past decade, although reliable and consistent statistical renewable energy sources data, collected since 1989, exist for all 15 countries of the European Union and for Western Europe (defined here as the EU-15 plus Switzerland, Norway, and Iceland). (more…)
There are various and somewhat complementary reasons to foster the growth of renewable energy sources in Europe. A major incent ...
The development of the ‘‘new’’ wind and solar technologies is of great importance for the future contribution of RESs to energy sup ...
Although technology change (usually involving an improvement in energy efficiency) is not inherently a geographic process, it does ...
The energy that people use every day comes from many different sources. The resources are divided into two main groups: renewa ...
Renewable energy sources cannot run out and causes so little damage to the environment that its use does not need to be restric ...
In most countries, geothermal resources are classified as natural resources belonging to the government. Since the 1980s, there has been a worldwide trend to corporatize and/or privatize government commercial activities. Whereas the geothermal resources in the United States have been commercially developed by the private sector since the 1960s at The Geysers, other countries, notably The Philippines, Indonesia, and New Zealand, did not started private commercial geothermal projects until the 1980s. These private power developers are known as independent power producers (IPPs). There is a perception that the private sector is more efficient than the public sector. The efficiency arises from the increased flexibility of the private sector and its accessibility to commercial funding. (more…)
"Spain has great potential but lack geothermal legislation and investment." Besides being clean, renewable and friendly, easily man ...
The Geologists Association president advocates the use of geothermal energy by its high durability and low maintenance. Besides a r ...
Geothermal drilling technology is adapted from the oil industry. Most of the geothermal wells are drilled with a rotary-type drilli ...
The total installed geothermal power generating capacity in the world is approximately 9000 MWe from 21 countries, with the United ...
According to the German standard VDI 4640 geothermal energy is stored energy as heat beneath the Earth's solid surface, encompa ...
The energy efficiencies of various fuel production pathways from well to pump. The efficiencies shown are defined as the energy in a given fuel (available at pumps in vehicle refueling stations) divided by total energy inputs during all Well-to-Pump activities, including the energy content of the fuel. One way to interpret the Well-to-Pump efficiencies in the figure is as the difference between 100% and the energy efficiencies, which roughly represent energy losses during Well-to-Pump stages for making a given fuel available at the pump. As stated in Section 3, Well-to-Pump activities include biomass feedstock production; feedstock transportation and storage; fuel production; and fuel transportation, storage, and distribution. (more…)
The combination of well-to-pump results and the energy use and emissions associated with vehicle operation (also called the pum ...
It shows Well-to-Wheels Greenhouse Gas emissions of the 23 vehicle/fuel systems. For each system, the bottom bar represents CO2 ...
Because different studies have different system boundaries and parametric assumptions, the studies described in Section 7 resulted ...
There are different types of vehicle propulsion systems and the transportation fuels that have been studied for their potential ...
At present, in the United States and worldwide, motor vehicles are fueled almost exclusively by petroleum based gasoline (or re ...
The energy that people use every day comes from many different sources. The resources are divided into two main groups: renewable energy and nonrenewable energy. Renewable energy sources are those that can be used again and again. Renewable energy resources have unlimited supply. (more…)
In Europe, modern renewable energy sources technologies were explored thoroughly for the first time after the oil embargo/ price cr ...
During the US Presidential Election 2008 Campaign, the renewable portfolio standard was one of the main agendas for Presidentia ...
The broad range of home solar energy systems are mostly known as Photovoltaic Systems (PV) or Thin Film Solar Technology. The s ...
The hydrogen can come from various sources including fossil fuels, wind, solar, biomass, nuclear, solar thermo-chemical reactio ...
Renewable energy sources cannot run out and causes so little damage to the environment that its use does not need to be restric ...
It shows Well-to-Wheels Greenhouse Gas emissions of the 23 vehicle/fuel systems. For each system, the bottom bar represents CO2 -equivalent emissions of CO2 , CH4 , and N2O, combined with their greenhouse global warming potentials (GWPs). The top bar represents CO2 emissions only. For the two ethanol pathways (corn and cellulosic ethanol), there are some negative emissions. They represent carbon uptake during biomass growth. The carbon is eventually emitted to the air during ethanol combustion air. (more…)
The combination of well-to-pump results and the energy use and emissions associated with vehicle operation (also called the pum ...
There are different types of vehicle propulsion systems and the transportation fuels that have been studied for their potential ...
The spark-ignition and compression-ignition engine and internal combustion engines technologies that are currently employed in ...
The fuel cycle for a given transportation fuel includes the following processes: energy feedstock (or primary energy) product ...
The energy efficiencies of various fuel production pathways from well to pump. The efficiencies shown are defined as the energy ...
During the twentieth century, energy has become much more easily available. Most energy comes from burning fossil fuels (oil, gas, and coal). These resources are only found in certain geologic formations. (more…)
Geothermal energy is energy created by the heat of the Earth. Under the Earth’s crust lies a layer of thick, hot rock with occa ...
Wind energy comes from the mismatched heating system of the planet that runs all day and night, heated and cooled by the sun. T ...
The wind power potentially could produce 40 times more electricity than worldwide energy consumption annually, according to res ...
Magnetic power generator acted as a generator of free power because it generate electricity to power your home at free of cost to b ...
In Europe, modern renewable energy sources technologies were explored thoroughly for the first time after the oil embargo/ price cr ...
During the US Presidential Election 2008 Campaign, the renewable portfolio standard was one of the main agendas for Presidential candidate, Mr. Barrack Obama. He suggested that in order to have an environment fit for living, one-fourth of the energy used in United States must come from renewable energy resources, such as wind, water, solar and so on. (more…)
In Europe, modern renewable energy sources technologies were explored thoroughly for the first time after the oil embargo/ price cr ...
The energy that people use every day comes from many different sources. The resources are divided into two main groups: renewa ...
Renewable energy sources cannot run out and causes so little damage to the environment that its use does not need to be restric ...
In 2006, total world wind generating electricity capacity was around 72,000 MW, producing some 160 terawatt-hours (TWh) per yea ...
Although technology change (usually involving an improvement in energy efficiency) is not inherently a geographic process, it does ...