Hydroelectricity power is a technical term, referring to electricity, generated by hydropower. At the present, electricity generation is about 715000 MW or it is equivalent to 19% of the global hydro electricity generation. Indeed, the 63% of the electricity energy, generated by the renewable energy comes from the electric hydropower. Hydroelectric power plant At such power plants, the dammed water is used for generation of electricity. The collected water behind the dam falls on the turbine blades, causing the rotor to spin. Also, the turbine rotor spinning makes generator rotate and generate electricity, consequently. Most hydro-power plants provide their required energy from the energy of water potential, collected behind a dam. In this state, the energy produced by water depends on the water volume, collected behind the dam, and the head difference between the dam`s reservoir and its water outlet. This head difference is called pressure head. In fact, the rate of water’s potential energy is proportional to the pressure head. In order to increase the distance or the pressure head, water usually flows across a rather long distance, through a big penstock, to reach the water turbine. Pumped storage power plant is another type of hydropower plant. This pumped storage p.p. is assigned to support an electric network during its pack hours. This power plant only shifts water between two levels in different hours. At times of low electrical demand, water is pumped into a higher reserv …

Hydroelectricity power is a technical term, referring to electricity, generated by hydropower. At the present, electricity generation is about 715000 MW or it is equivalent to 19% of the global hydro electricity generation. Indeed, the 63% of the electricity energy, generated by the renewable energy comes from the electric hydropower.
Hydroelectric power plant
At such power plants, the dammed water is used for generation of electricity.
The collected water behind the dam falls on the turbine blades, causing the rotor to spin. Also, the turbine rotor spinning makes generator rotate and generate electricity, consequently.
Most hydro-power plants provide their required energy from the energy of water potential, collected behind a dam. In this state, the energy produced by water depends on the water volume, collected behind the dam, and the head difference between the dam`s reservoir and its water outlet. This head difference is called pressure head. In fact, the rate of water’s potential energy is proportional to the pressure head. In order to increase the distance or the pressure head, water usually flows across a rather long distance, through a big penstock, to reach the water turbine.
Pumped storage power plant is another type of hydropower plant. This pumped storage p.p. is assigned to support an electric network during its pack hours. This power plant only shifts water between two levels in different hours.
At times of low electrical demand, water is pumped into a higher reservoir to convert electrical energy into gravitational potential energy. However, at times of high electrical demand (peak hours ), the stored water is released to the lower level and spins the water turbine to generate electricity and meet the network demand. These types of power plant create balance at different hours, and make the network load coefficient improve, and costs of electrical energy generation reduce.
Another kind of power plant is tidal power plant. As its name represents such a power plant provides its necessary power from the water head difference during a day. Also, this kind of power plant, can operate as a power network support, at the peak hours demand.
There are certain very limited power plants which use run-of-the river (water) energy. In this group of power plants, it is not necessary to build a dam, as the turbine of such power plants operates like a “water wheel” .
A comparison to the other methods of power generation
In the hydroelectricity power generation, there isn’t any dispersion of pollutants – due to burning of fossil fuels, for example sulfur dioxide, nitric acid, carbon monoxide, dust and lead (existing in coal) when electrical energy is produced. Furthermore, having eliminated unnecessary fuels such as coal, hydroelectricity , in a way, indirectly reduces the risks, due to coal mining.
In hydropower plants, energy resources are more predictable, comparing to wind farms power plant. Also, the hydropower plants can improve the network load coefficient and start generating electricity, whenever required, and consequently, balance the network, at the times of high demand.
However, contrary to a thermal power plant, more time is spent on the dam studies for a hydropower plant. Some 50 years of data would be needed, regarding the river behaviors, to fulfill a precise calculation and select the best dam location and its construction type. Proper locations for establishment of hydropower plants are limited, contrary to the power plants, using fuels to provide energy. Furthermore, most hydropower plants are far from the densely populated centers, and it will be cost bearing, to certain extent, concerning their power transmission.
Another disadvantage of this type of power plant is its highly dependent on the water intake rate, and as the water collected behind the dam depends on precipitation, therefore, whenever snow and rain falls reduce, the generation of electricity energy reduces, too.
However, having taken into the consideration the company`s the highly professional engineers and managers with the experiences in the similar projects-completed, besides that, the company’s commitment and consciousness, concerning the project employer’s consent and the stakeholder`s, all in all have made Tarah Energy be reliably competent to actively be involved in providing every engineering and studying services, related to the hydroelectricity power plants.
In other words, Sepanta Tarah Energy Consulting Company attempts to warrant its clients’ success in their projects having relied on its different experts’ technical assistance in engineering and consultancy areas.
The scope of services:
 Feasibility study
 Design of power plant structures and equipment
 Preparing bid documents
 Supervision on the construction of hydroelectricity power plant
 Determining the power generation price for the hydro-electricity power plants.

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