Etiket arşivi: wind power

Effects of Renewable Energy on Sustainable Development

The term ‘sustainability’ is firstly used in the Brudtland Report of 1987. In this report, sustainability is defined as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”[1] Thus, following this definition, sustainable development can be understood as any action on behalf of development must meet the needs of present by not having negative impacts on future generations. After the emergence of the term ‘Sustainable Development’, many frameworks about the concept have been thought and put forward. In Brudtland Report, sustainable development is found in the intersection set of three mutually dependent areas of sustainability which are environmental, social and economic. What is important about these areas is any change in one area will disturb the other two. So, their effects overlap.

Energy is one of the most important elements of Sustainable Development
Energy is one of the most important elements of Sustainable Development

Energy is a key element of economic development, key factor of environmental concerns and vital for social welfare. Hence, energy can be regarded as the most important element of the concept of sustainable development and it can be shown as the most significant point of intersection set of three mutually dependent areas of sustainability.[2]  Due to highly invested know-how in extraction of fossil sources and developed industry to use them as fuels lead Energy Sector to grow through non-renewable generation in last two centuries. This phenomenon proceeded until 1973 Oil Crisis.[3] Such a big crisis raised a resource security question in developed countries. The question leads a development in renewable energy sector. However, today the vast majority of the energy generation is still supplied by fossil fuels. When the Brudtland’s three mutually dependent areas are taken into account, it is not possible to achieve sustainable development with energy generation by fossil fuels, because any change in one area must not impact any other in a negative way. When we look into the energy generation from fossil fuels, we simply realize that non-renewable energy generation can accelerate economic growth while it produces harmful emissions for environment and social well-being. Thus, the basic requirement of sustainable development is failed due to the high demand on fossil fuel energy generation.

According to US Energy Information Administration (EIA) in 2008, total primary energy consumption of world was 485.718 Quadrillion Btu (British Thermal Units) and in 2012 that became 524.076 Quadrillion Btu[4] and due to increase in technological developments, industry and access to electricity, this value keeps growing by every seconds. Thus, the required energy must be supplied by other type of sources. As it is mentioned, supplying energy by fossil fuels is violating the nature of sustainable development. After the rising of the concept of renewable energy, it becomes a strong candidate to replace fossil fuel domination in energy market. However, can renewable energy generation meet the basic requirements of sustainable development? This report argues how renewable energy affects the sustainable development considering the three mutually dependent areas (environmental, social and economic) of Brudtland Report.

When the environmental effects of an energy system are taken into account, as a first step the effects on ‘global warming’ is considered. Then, the effects on air, water and soil can be thought and finally the impacts on animals and plants are taken the place. For mostly used and different kinds of renewable energy resources, their direct environmental impacts can be seen in Table-1 below:

 

Resource Type Impacts on Global Warming Impacts on Air,Water,Soil Impacts on other living creatures
Solar Power(PV and CSP) No No Pollution – Land use for PV 3.5-10 acre/MW For CSP 4-16.5acre/MW Occupied land cannot be used for agriculture during operation.
Wind Power No No Pollution – Land use 1 acre/MW Bird and Bat deaths from collision
Tidal/Wave Power No No Pollution – possible conflict with fishing and shipping Possible damage to marine habitat during construction
Hydro No No Pollution – Flooding of useful area in large scale deployments Fish and other organisms might be injured and killed by turbine blades
Geothermal No for closed loop systems- Open loop systems emit H2S, CO2, CH4,NH3 No Pollution for closed loop Systems- Open loop systems emit H2S which causes acidic particulates in atmosphere No Effects for closed loop systems – Acidic particulates caused by open loop systems damage crops,forests,soil, lakes and streams
Biofuels Combustion produces CO2, but the amount released equals to amount absorbed during growth No No

Table-1: Environmental Impacts of different kind of renewable sources [5]

As it can be seen from the Table-1, in terms of greenhouse effects which cause global warming, the only risk is caused by open loop geothermal power plants. The problem can be overcome by building geothermal power plants as closed loop systems. However, if it is not possible, the most effective filters can be used to capture H2S which might decrease their impacts importantly. On the other hand, none of the renewable resources do not cause environmental pollution, except Tidal/Wave and Hydro power sources. Possible conflicts arising from fishing and shipping can be overcome with policy regularities, but flooding big amount of area can be regarded as a considerable problem for useful lands. When the impacts on other living creatures are examined, the point of birth and bat deaths from collision is noticed. This has been argued by some environmental circles. About this issue David MacKay notes that “It’s been estimated that 30.000 birds per year are killed by wind turbines in Denmark where windmills generate 9% of the electricity. Horror! Ban windmills! We also learn, moreover, that traffic kills one million birds per year in Denmark. Thirty-times-greater horror!” [6] When the benefits of the cars are taken into account, no one would think of banning them from a country, because of its effects on birds. Hence, arguing about impacts of wind mills on birds and bats is as meaningless as the effects of cars on birds. The effects of hydro plants on fish are also given in the table in the same equation with previous wind turbine case. Therefore, if geothermal power plants are built as closed loop systems and large scale hydro plants would not cause floods; renewable energy generation will cause zero environmental effects which means that sustainable environment can be achieved by renewable energy generations.

The social aspects of human life have been debated as ‘basic’, so when basic requirements are met, then other needs can be considered. The term ‘basic’ is understood within different concepts, but the undeniable and the most ‘basic’ need of human is security and health. The air pollution which is caused by fossil fuels is one of the most controversial topics of the recent news around the world. Many countries like China, India, Italy, England, etc. declare ‘high alert air pollution’ for some of their metropolises. According to U.N, about 3.5 million deaths a year are caused by indoor air pollution while another 3.3 million are caused by outdoor air pollution which means air pollution kills more people than AIDS and malaria combined.[7] Besides these death rates, Scientific American released the data of death rates from energy production accidents among OECD countries which is shown in Table-2:

Energy Source Deaths from Energy Production Accidents (per 100 GW of power generated for a year)
Hydro 0.27
Nuclear 0.73
Natural Gas 7.19
Oil 9.37
Coal 12.0
Photovoltaic 0.02
Enhanced Geothermal 0.17
Onshore Wind 0.19

Table-2: Death rates from energy production accidents among OECD countries[8]

When the provided data are examined, the danger of fossil fuel generation for health and related safety risks can be understood. Also, when zero air pollution and the least death rates about energy production accidents are taken into account, the respect of renewable energy towards the most ‘basic’ and the most important social aspect of human life can be realized. One would consider that in 21st century, electricity access should be regarded as another basic right of human. This is because access to electricity is important for the provision of clean water, leads huge improvements in health services and reduces poverty so that it boosts the quality of human life. However, today around 1.1 billion people still do not have access to electricity which corresponds to 20% of the world population.[9] The costs of grid extension and conventional power generation are still considerable challenges for some developing countries. Moreover, the rapid population growth leads to increase the number of people who lives under the same poor life conditions. In order to overcome this challenge, investments in small scales renewable energy supplies and micro scale grids can be regarded as the best possible solution. In IEA’s World Energy Outlook (2015) , it is noted that power generation projections under the new policies scenario for methodology for energy access analysis, the rural generation is divided between mini-grids and off-grid generation, including oil, solar PV, mini-hydro, wind and bioenergy in the mix. [10] Although, IEA pointed out that using oil and bioenergy as an electricity generation method, their maintenance costs may not be coverable by the people of developing areas. Thus, the most feasible solutions for them are other renewable sources which are noted in the list. To conclude, one can understood that the renewables are the most supportive type of energy generation in terms of promoting social welfare.

The effects of renewable energy deployment on sustainable economic development might be the most controversial part of this topic. High initial investment costs per kW, reliability problems which occurred due to intermittencies in supply and non-dispatchable generation in most of the renewable energy technologies are noted as the negative impacts on sustainable economic development. However, when the concept is taking into account from a broad perspective, it can be understood that sustainable economic growth can be gained in long term. Researches show that the effect of traditional energy sources is statistically significant and positive in sustainable economic development and among the fossil fuels, oil is the one that has mostly contributed to economic growth.[11] In recent days, since the volatile prices of oil, the world is witnessing hard times of some exporter countries. Fixed prices and long term contracts of renewable energy generation keep the suppliers and customers from volatile prices. Therefore, the country does not face with economic crises which are related with the devaluation in prices of an energy supply. There is also a hidden cost of fossil fuel energy generation. As it is mentioned in previous part, there are significant health impacts of fossil fuel emissions on people’s health and the hidden cost of this health impacts can lead to irrevocable consequences. A recent study about how much would electricity cost in US if the retail price reflected the health impacts of burning fossil fuels shows that accounting for such costs would add an average of 14 to 35 cents per kilowatt-hour to retail cost of electricity.(2013)  When the hidden cost is taken into account as nationwide, these hidden health costs add up to as much as $886.5 billion annually, or 6% of GDP.[12] Since, renewable energy systems has not any negative impacts on health, there is no need to consider such kind of hidden costs. Another positive impact of renewable energy on economic growth is that it promotes employment. Worldwide renewable job creation has been compiled by the Renewable Energy Agency (IRENA,2013). Various kinds of renewable sources provide employment opportunities. Table-3 shows the total direct and indirect employment in renewable energy sector for selected countries and world.[13]

Germany Spain Other EU USA China India Brazil WORLD
Biomass 57 39 178 152 266 58 753
Biofuel 23 4 82 217 24 35 804 1379
Biogas 50 1 20 90 85 266
Geothermal 14 0 37 35 180
Hydropower 7 2 18 8 12 109
Solar PV 88 12 212 90 300 112 1360
CSP 2 18 17 37
Solar Heating/Cooling 11 1 20 12 800 41 892
Wind Power 118 28 124 81 267 48 29 753
Total 370 105 691 612 1747 391 833 5279

Table-3: Employment in Renewable Energy Globally and for Selected Countries(result/1000 people)

As it can be seen from the Table-3, in 2013 renewable energy sector promoted 5279000 jobs in worldwide. Thus, it creates not only a big opportunity for economic welfare but also  increase the employment rate of individuals which will result in economic development of the countries.

To conclude, this report discussed the effects of renewable energy sources in the eyes of economic, social and environmental aspects of sustainable development. As a result, it is now clear that among energy supply resources, renewable energy can be regarded as the most suitable source for sustainable development. Repeatedly, parallel to the definition of sustainability, renewable energy brings development without giving any harm to future generations. So, in order to achieve sustainable development, one can be sure that alternative energy resources bring social, economic and environmental sustainability which can be achieved by renewable energy generation.

**References are provided on request.

 

Yenilenebilir Taşımacılık: Son Gelişmeler, Yeni Fikirler

Uzun zamandır yazmak istediğim bir konuya biraz geç de olsa başlamanın mutluluğunu yaşıyorum. İlk yazım olan “Yenilenebilir Havacılık Devrimi: Solar Impulse” yakıt olarak sadece güneş enerjisi kullanan uçağın devrim niteliği taşıyan hikayesini anlatmaktaydı. O yazıyla ilgili aldığım olumlu geri dönüşler beni yenilenebilir taşımacılıkla ilgili bir yazı hazırlamaya ikna etti. Daha birkaç gün önce Volkswagen’ın dizel arabalarında yaşanan skandalın ardından gözler tekrar fosil yakıt kullanan araçların çevreye verdiği zararlarla ilgili tartışmalara döndü. Bu yazımda sizlere, ulaşımda yenilenebilir enerjiden faydalanan araçlar hakkında son gelişmeleri ve yeni fikirleri paylaşacağım.

Solar Impulse’ın dünya rekorları kıran yolculuğu 8.etabını tamamladıktan sonra Hawaii’de güneş hücrelerinde aşırı ısınmadan kaynaklı teknik bir arıza sebebiyle mola verdi. Dünya turuna Nisan 2016’da devam edecek olan Solar Impulse ekibi neleri başardı? Abu Dhabi’de başlayan yolculuk sırasıyla Muscat, Ahmedabad, Varanasi, Mandalay, Chongqing, Nanjing ve Nagoya’ya gitti. En kritik yolculuğa Nagoya’dan çıkan André Borschberg tam 117 saat 52 dakika uçarak Hawaii’ye vardı. Bu başarı, 16 yıl önce Bernard Piccard’ın hayali olan fosil yakıt kullanmadan kesintisiz uçabilmenin vücut bulmuş haliydi. Solar Impulse ekibi bu dünya rekoruyla[1] güneş enerjisinin gücünü tüm dünyaya göstermiş olmakla birlikte, yenilenebilir enerjinin uygulanabilir olduğunu kanıtladılar.

Solar Impulse gibi umut vadeden bir örneğin yanında dünyada yaşanan diğer gelişmelere bir bakalım. San Francisco tabanlı Wind+Wing Technologies şirketi deniz taşımacılığında yelkenlere çok farklı bir boyut getirmeyi amaçlıyor.[2] Denizciliğin temelini oluşturan yelkenler insanoğlu tarafından denizcilik sektöründe yıllarca kullanıldıktan sonra, makineleşmeyle ve sanayi devrimiyle sektördeki yerini hızla kaybedip, spor ve hobi amaçlı aktivitelerde kullanılmaya başlanmıştı. Wind+Wing Technologies kurucularından olan Jay Gardner hedeflerini Dünya’nın her bölgesinde bulunan bedava rüzgar enerjisini, bilgisayar kontrollü kanatlarla en etkili şekilde kullanmak ve bu kanatlarla temiz ve güvenilir deniz taşıtları imal etmek olarak belirledi.[3] Geliştirilen kanatları halihazırda çalışan bir gemiye takmak mümkün, ancak bu kanatlara özgü tasarlanacak bir gemiyi olabilecek en ucuz yakıt maliyetiyle en verimli şekilde kullanmak mümkün olacak. Kanatların kullanımı çok kolay, gemiye montaj edildikten sonra yapmanız gereken tek şey sadece bir düğmeye basmak. Otomatik kanatlar size en etkin kullanım imkanını sağlıyor. Peki ya nasıl? Wind+wing kanatlarının üstünde rüzgarın şiddetini ve yönünü tespit etmek

Kanat üzerindeki mikrofon rüzgarın yönünü ve şiddetini ölçüp ona göre kanada yön veren  mikroişlemci için toplayıcı görevi yapıyor
Kanat üzerindeki mikrofon rüzgarın yönünü ve şiddetini ölçüp ona göre kanada yön veren mikroişlemci için toplayıcı görevi yapıyor

için bir mikrofon bulunuyor, bu mikrofon aldığı bilgileri bir işlemciye iletiyor, işlemci optimum kanat açısını yön motorlarına iletiyor ve kanat geminin gideceği doğrultuda maksimum katkıyı sağlayacağı yöne doğru dönüyor. Kanatlar gereken gücü üzerlerindeki PV panellerinden sağlıyor, yani anlaşılacağı üzere bütün işlemler yenilenebilir enerji ile gerçekleştiriliyor. Firmanın en büyük projesi 400-750 yolcunun taşınabileceği feribotları[4] belirli deniz güzergahlarında kullanmaya başlamak. UC Berkeley Üniversitesi’nin araştırmasına göre geliştirilen feribotlar SF Ferry Building-Sausalito ve SF Ferry Building-Treasure Island rotalarında mükemmele yakın etki gösterebilirler. Şimdi en etkileyici bilgiyi geliyor, araştırmalar San Francisco körfezinde bu sistemlere uygun bir geminin çalışmaya başladıktan sonra elde ettiği yakıt tasarrufunun 5 yıl içinde geminin maliyetini çıkartacağını gösteriyor.

400 kişilik planlanan feribotun proje çizimi
400 kişilik planlanan feribotun proje çizimi

Hindistan Demiryolları’nın geçtiğimiz aylarda açıkladığı proje yenilenebilir taşımacılığa demiryollarını da dahil edecek gibi duruyor. Projenin fikir babası Hindistan Bangalore Bilim Enstitüsü, basitçe trenlerin üstüne güneş panellerini yerleştirmeyi amaçlayan proje trenlerde yılda 90,000 litre dizel yakıta karşılık gelen %15 civarı yakıt tasarrufu sağlayıp, 239 ton karbondioksit emisyonunu engelliyor[5]. Akıllara gelen tek soru panellerin montaj sonrası hızla hareket eden tren üzerinde sağlayacağı verim, ancak uzmanlar mühendislik firmaları ve araştırmacıların yürüteceği ortak çalışmalarla hiçbir sorun çıkmayacağına eminler.  Trenlerin çalışmadığı müddetçe ürettiği elektriği iki seçenekli kullanmak mümkün, birinci seçenek üretilen ekstra elektriği akülere depolayıp bulutlu havalarda ya da geceleri kullanmak, ikinci seçenek ise üretilen elektriği direk şebekeye aktarmak. Yani bir nevi mobil güneş santrali olabiliyor. İşin ekonomik getirisine baktığımızda yine çarpıcı bir sonuç ortaya çıkıyor, yakıt tasarrufu panel fiyatlarını 3 sene içinde çıkartıyor.

Hindistan Demiryolları konumlandıracağı güneş panelleriyle %15 civarında yakıt tasarrufu hedefliyor
Hindistan Demiryolları konumlandıracağı güneş panelleriyle %15 civarında yakıt tasarrufu hedefliyor

Bu mükemmel çalışmaları okudukça geleceğe daha umutlu bakmaya başlıyoruz. Ancak kendi ülkesini düşünmeden edemiyor insan, biz bu işin neresindeyiz? Yenilenebilir enerjiye yönelimimiz lisanlı proje yarışmalarıyla mı kalacak? Entegre uygulamaları hiç düşünmeyecek miyiz? Wind+Wings’in yelken projesinin İstanbul şehir hatlarında kullanılmaya başlanması çok uzak bir hayal olmamalı, yeni yapılan hızlı trenlerimizi bahsedilen panel projelerine uygun üretip raylara çıkartmak, bu işte ben de varım demek büyük bir devlete yakışan adımlar olacaktır. Yazıma Solar Impulse ekibinin dünyaya miras bıraktığı, umut vadeden etiketini yazarak son vermek istiyorum. Çalışıyoruz, çabalıyoruz ve inanıyoruz #futureisclean!

[1] http://www.theverge.com/2015/7/2/8882253/solar-impulse-2-breaks-world-record-longest-solo-flight

[2] http://www.windwingtech.com/index.html

[3] http://www.windwingtech.com/missionstatement.html

[4] http://www.windwingtech.com/400paxferry.html

[5]http://www.abplive.in/india/2014/06/20/article346944.ece/Solar-roof-for-trains-to-save-fuel