Wind Energy

What makes wind energy so special

Technology

How it works

Wind power is one of the most elegant and simple ways to produce energy. Moving air drives the rotor blades of a wind turbine to turn around. The kinetic energy of the rotation is used to power a generator which produces the electricity.

Wind turbines

The visible parts of a wind turbine are the blades, hub, nacelle and tower. The main operating components are situated inside the nacelle (rotor, stator and machine house among others) and inside the tower (E-module). The blades are made out of laminated materials such as composites, balsa wood, carbon fibre and fibreglass. The tower typically consists of three to four tubular steel sections with a concrete basement to prevent the turbine from falling. The nacelle and blades are mobile and turn around so that the hub always faces in the direction where the wind is coming from.

Wind Parks

A wind park is an area of land with several wind turbines on it. Because wind turbines produce wakes, the park layout has to be carefully designed and the turbines cannot be located too close to each other. All turbines of a park are connected at a substation, where the electricity is collected. From there, the electricity is then fed into the existing power grid.

Global Context

Facts and figures of this section originate from the Global Wind Energy Council (GWEC). 

History

Since ancient times, wind power was used by humans - for example for natural ventilation in buildings or already 5,500 years ago for sailing with boats. The Greeks constructed wind-driven machines and windmills, which were used as early as in the 7th century after Christ. The first wind turbine to produce electricity was built in 1887 in Scotland. However, wind power got overrun by cheap fossil fuel electricity production and it took nearly a century until it became finally economically viable. In the seventies of the last century, when oil got more expensive and air pollution a matter of concern, the renewable resource wind gained more importance again. At last, a remarkable wind boom started in the 90s, when also awareness about air pollution and climate changes rose.

Ongoing boom

Global Cumulative Installed Wind Capacity 2001 2018

Worldwide, the installed capacity of wind power per year is continuously increasing. Over the last ten years, an average annual growth rate of approx. 15% was recorded. This boom strengthened during the last years with the installation of huge wind capacities worldwide. With regards to technology and performance, this resulted in a great leap forward. Nowadays, wind power is one of the cheapest energies on the market. There is no other technology with similar growth rates as wind, and its share of the global energy mix is increasing steadily. 

Figures and Future

By the end of 2018, there has been 591,549 MW of wind energy produced in more than 90 countries worldwide. China, USA, Germany, India, Spain, UK and Canada are the countries in the world with the biggest wind markets.

Today, more than 3% of global electricity are supplied by wind power. For the year of 2030, this share could rise to 17-19%.

Benefits

Wind is free

In a world of finite resources, wind energy is a perfect solution. Wind is a free and indigenous fuel. There is no cost to bring it to Ghana, the price never changes and it will never run out. It provides a secure and clean supply of power to Ghana for years to come. 

Dumsor Dumsor

Ghana’s severe electricity lack in the past years was retaining economic growth and impedes the country to enhance its wealth. As one of the biggest wind parks on the African continent, the 200 MW Konikablo project will improve the power supply in Ghana and make it more reliable. It will be an important stepping stone for getting into renewable energy production and therewith help to overcome “dumsor”, the Ghanaian vogue term for the ongoing electricity crisis.

No pollution

Fossil fuels like coal, oil and gas provoke climate change and pollute our air with toxic substances. Atomic power devastates land because of uranium mining, comprises a high risk of nuclear contamination during operation and leaves behind radiating waste which will be dangerous for ten thousands of years. In contrast, wind turbines do not produce any harmful or toxic substances during operation. Complying with the EPA guidelines, there are no health dangers and the safety risk is insignificantly small. In addition, compared to fossil fuel and nuclear power plants, wind technology uses almost no water. Once the lifetime of a wind park is over, the turbines can be dismantled and the materials recycled.

Community Benefits

Communities around the project area will not only benefit from better power supply like the rest of Ghana, but also profit from direct improvements. The most important gains are jobs for local people, which will create new possibilities. It is estimated that there will be around 600 jobs created during the phase of construction. During the 20 - 25 years of operation, around 80 people could be employed permanently. Apart from this direct employment, there will be a substantial contribution towards the general economic development by creating employment through suppliers.

A further indirect benefit for the communities around the Wind Farm will be the construction of new access roads and the improvement of existing tracks. After construction, these roads can also be used by the public, what will ease the access for the farmers to their fields.

Finally, a share of the Wind Farm’s operational revenue will be spent on community projects, which aim to directly benefit the local people of the Wind Farm.

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