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PFC Agrees with NHPC to Fund Hydro Power Project

NHPC Hydro Project

In order to run a hydropower project, the National Hydro-Electric Power Corporation Pvt Ltd. (NHPC) has signed an MoU with Power Finance Corporation (PFC) on Tuesday. The aim behind this initiative is to achieve funding from PFC for the acquisition of their stressed assets. 

NHPC is an agency responsible for developing hydropower in India and also diversifying solar and wind power. In addition to this, it also provides consultancy services to hydropower and renewable energy projects. The memorandum signing is also said to boost the association and herald transformational opportunity between both agencies, including PFC and NHPC. The project will also help facilitate knowledge among people and contribute to the sustainable development initiatives in the country. 

The memorandum was signed SubirSaha, Executive Director, Projects- SR, ER&NER, CSP&C, signed the MoU on behalf of PFC and VK Maini, Executive Director, Strategy, BD and Consultancy, signed from NHPC. The MoU was signed in the presence of PK Singh, Director-Commercial and Additional Charge-Projects, PFC; RR Jha, ED-In-charge-Projects; Manoj Sharma, ED-L&D; Praveen Verma, SGM-L&D; and Nitin Kumar, GM-Central Sector Unit, PFC.

Hydropower project involves providing an impoundment facility. It is an extensive hydropower system that consists of using a dam to store river water in a reservoir. The reservoir releases water to flow through a turbine, followed by spinning. It after activates a generator to produce electricity, helping to generate green energy. Moreover, the cost of setting up hydropower is relatively low as compared to other methods. Unlike coal and gas plants, it does not consume water to operate. There are several advantages linked with hydropower plants. These include:

  • Generating green energy is the best way to obtain electricity and benefit the environment. Hydropower is one of the best sources of energy produced through the water cycle driven by the sun. 
  • Hydropower does not pollute the environment like other methods, including coal and natural gas. 
  • Hydropower is one of the most affordable sources of energy. It offers low-cost energy and durability as compared to other methods. Even its construction cost does not lay much stress on your pocket if you use pre-existing structures such as bridges, tunnels, and dams. 

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EV News

Tidal Energy- the highs, the lows and the generation of energy

Tidal Energy

Water is one of the most important natural resources in the life of living organisms, so much so that it is often called- the elixir of life. Many researchers believe that sufficient water to fill the oceans may have always been there on the earth since the beginning of the planet’s formation. But were the tides, the highs and lows in water’s life, born with the birth of water? Tides are the rise and fall in sea level that are caused by the combined effect of the gravitational forces of the sun and the moon combined with the rotation of the earth. The youngest among these is the moon which, according to its mineral composition, is around 4.425 years old. This implies that the tides are much younger than the first occurrence of water on earth. But it was only after 600 AD that humans started using oceans’ tides for energy generation.

Tides were used, both in Europe and on the Atlantic coast of North America, for producing mechanical energy to mill grains. This was done by containing incoming water in large storage ponds, which used to turn the water wheels when the tides moved out. This was possible for about two to three hours, usually twice a day. The oldest, excavated tide mill is dated to the year 619. It was discovered at Northern Ireland’s Nendrum Monastery on Mahee Island in Strangford Lough. By the 18th century, 76 tide mills were being used in London alone. At one time there were about 750 tide mills in operation around the shores of the Atlantic Ocean. This included about 300 on North American shores, about 200 in the British Isles, and about 100 in France. But these tide mills were not a part of electricity generation, which we now associate with tidal energy. However, as the end of the 19th century arrived, the idea of using tidal power to generate electricity became a serious consideration. France was the first country to build a commercial-scale, modern tidal power plant. It was built in 1965, in the Rance Estuary near St. Malo, France, where a total of 24 turbo generators, with new hydroelectric, efficient turbines, were installed and this plant is still generating clean energy to this day. La Rance hence began the more modern history of tidal energy.

Today there are only nine tidal power plants in operation around the world. The largest tidal energy power plant in the world is in South Korea that goes by the name- Sihwa Lake Tidal Power Station. When completed in 2011, it surpassed the 240 MW Rance Tidal Power Station which was the world’s largest for 45 years. Operated by Korea Water Resources Corporation, it has a total power output capacity of 245 MW produced by its ten 25.4 MW submerged bulb turbines.

The intriguing fact about tidal energy is that it is the only technology that draws on energy inherent in the orbital characteristics of the Earth–Moon system, and to a lesser extent in the Earth–Sun system. While the other sources of energy, utilized by humans, either originates directly or indirectly from sun, like- solar energy, wind, biofuel, fossil fuels, etc., or from Earth’s mineral deposits of fissionable elements- nuclear energy, or from the earth’s eternal heat- geothermal energy. Another fact about tidal energy is that it is a predictable source of energy, which is made possible by forecasting the positions of the Sun and Moon — their distance from Earth, their direction in space, and how they’re moving.

There are different methods to capture the power of tides to generate electricity. These methods are called Tidal Technologies. These four generating methods are-

Tidal Stream Generator- a non-barrage tidal scheme that uses the kinetic energy present in moving water of the ocean to generate electricity making it a hydrokinetic energy system. Tidal Stream is the horizontal flow of water through the oceans caused by the continuous ebb and flood of the tide, which as we know is the vertical up-down movement of the oceans water. While it shares similarities with the wind turbines, stream energy can be used at a much higher rate due to water being denser than air.

Tidal Barrage- it makes use of the potential energy of tides using large dam called barrage. The water, when the sea level rises, starts coming in through the barrage gates, which is then channelled into a large basin behind the dam. At high tide, the barrage gates close, creating a pool, or tidal lagoon. With the receding tides the water is released, converting the potential energy into mechanical energy, through the barrage’s turbines that results in generation of energy.

Tidal Lagoon- a new tidal energy design option is to construct circular retaining walls embedded with turbines that can capture the potential energy of tides. The created reservoirs are similar to those of tidal barrages, except that the location is artificial and does not contain a pre-existing ecosystem. They can be constructed along the natural coastline and can also generate continuous power.

Dynamic Tidal Power- is a theoretical technology that uses the difference between the potential energy and kinetic energy of tides. Long dams are built from coasts straight out into the sea or ocean. During the movement of tides, water on one side of the dam is at a higher level than the other side. As this water flows through the dam, it drives a series of turbines installed within the dam and generates electricity.

Tidal energy is the most reliable source of renewable energy because the tidal movements are continuous, happening twice a day. It is a clean energy and one of the best replacements of fossil fuels. Although, tidal energy is quite far from generating energy for the whole world, 3000 GW is still being generated worldwide which is a good attainment for a newly prospered one in terms of technology. The largest producing active tidal energy power plant right now can only produce enough power for about 45,000 homes. However, larger electricity generation efforts are on the horizon; for example, the first phase of the MeyGen project in Scotland’s Inner Sound generated 700 megawatt-hours of electricity in August 2017. Four turbines off the north coast of Scotland generated enough energy to power nearly 4,000 homes in 2019. A tidal plant and barrage system is to be built on the Severn Estuary in the UK with a capability of generating 8000 MW. The potential energy that could be harvested from tidal movements on a global scale is enormous. It is estimated that around 1 terawatt of exploitable power is stored in the world’s oceans. This would be enough to power 10 billion 100-watt lightbulbs at once.

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