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[en] The current energy poverty, the future necessities of energy and the climatic change caused by the global warming, are factors that associates each, manifest with more clarity the unsustainable production way and energy consumption that demands the society in the current life. This work analyzes the nuclear energy generation like an alternative from the environmental view point that ties with the sustainable development and the formulation of energy use models that require the countries at global level. With this purpose were collected and reviewed documented data of the energy resources, current and future energy consumption and the international commitments of Mexico regarding to greenhouse gases reduction. For Mexico two implementation scenarios of nuclear reactors type BWR and A BWR were analyzed, in compliance with the goals and policy development established in the National Strategy of Climatic Change and the National Strategy of Energy; the scenarios were analyzed through the emissions to the air of CO2, (main gas of greenhouse effect) which avoids when the energy production is obtained by nuclear reactors instead of consumptions of traditional fuels, such as coal, diesel, natural gas and fuel oil. The obtained results reflect that the avoided emissions contribute from 4.2% until 40% to the national goal that Mexico has committed to the international community through the Convention Marco of the United Nations against the Climatic Change (CMNUCC). These results recommends to the nuclear energy like a sustainable energy solution on specific and current conditions for Mexico. (Author)
[en] Investigations within the framework of the state-commissioned project ''Re-evaluation of wastewater purification plants with anaerobic sludge treatment with due consideration to framework conditions in terms of the energy and the wastewater management situation in Rhineland-Palatinate'', abbreviated ''NAwaS'', have shown that due to the rise in energy prices and availability of innovative techniques and methods it can be economically efficient, from a plant capacity of 10,000 inhabitants upwards, to convert sewage treatment plants to sludge digestion. Findings from the NAwaS project show the state of Rhineland-Palatinate to have a large potential for the conversion of sewage treatment plants to sludge digestion. Depending on the rate of price increase as well as interest rates the use of digester gas could permit an increase in electricity output by up to 50% over today's levels. Moreover, converted plants would be able to almost completely cover their own heat demand and in addition permit energy savings totalling an expected 5 kWh/(inhabitant x a). If one incorporates the possibilities offered by the procurement of sludge or suitable co-substrates from outside sources, by retrofitting sewage plants with combined heat and power stations or micro gas turbines as well as by process optimisation in existing digestion plants, this gives a further significant increase in potential production capacity and hence economic efficiency. In some of the sewage plants the above measures for saving energy and boosting energy production will even lead to energy self-sufficiency.
[de]Die Untersuchungen innerhalb des Landesprojektes ''Neubewertung von Abwasserreinigungsanlagen mit anaerober Schlammbehandlung vor dem Hintergrund der energetischen Rahmenbedingungen und der abwassertechnischen Situation in Rheinland-Pfalz - NAwaS'' haben aufgezeigt, dass aufgrund der gestiegenen Energiepreise und mit innovativen Techniken und Ansaetzen die Umstellung von Klaeranlagen auf Schlammfaulung ab einer Anschlussgroesse von 10.000 Einwohnern wirtschaftlich sein kann. Fuer Rheinland-Pfalz wurde in dem Projekt NAwaS ein umfangreiches Gesamt-Potenzial fuer eine wirtschaftliche Umstellung von Klaeranlagen auf Faulungstechnik ermittelt. In Abhaengigkeit von der Preissteigerungsrate und dem Zinssatz betraegt dieses bis zu 50 % des derzeit erzeugten Stroms aus Faulgas. Zusaetzlich kann auf den umgestellten Anlagen der Waermebedarf fast komplett abgedeckt sowie eine Energieeinsparung von 5 kWh/(E x a) erwartet werden. Bezieht man die Moeglichkeiten, die sich durch eine Annahme von Fremdschlaemmen oder von geeigneten Co-Substraten, durch eine Nachruestung von Klaeranlagen mit Blockheizkraftwerken bzw. Mikrogasturbinen sowie durch eine verfahrenstechnische Optimierung bei bestehenden Faulungsanlagen ergeben, mit in die Ueberlegungen ein, so kann die Energieerzeugung und somit die Wirtschaftlichkeit insgesamt weiter deutlich gesteigert werden. Einige der Klaeranlagen werden sich durch die Massnahmen der Energieeinsparung und Energieerzeugung sogar zu energieautarken Klaeranlagen entwickeln koennen.
[en] The development of the electricity transfer between Germany and its neighboring countries as a consequence of the NPP shutdown in 2011 was studied using extensive data on electricity production and exchange. In 2011 the electricity production from nuclear power plants decreases by more than 20%, nevertheless during the first nine months the German electricity exports were higher than the electricity imported. Two thirds of the missing electricity from NPPs was generated by renewable energy, one third was replaced by reduced export. Summarizing the existence of electricity imports is not an indication for electricity supply endangerment in Germany and the shutdown of nuclear power plants has not increased the import of electricity from nuclear power plants in neighboring countries.
[en] The report shows that no electricity generation technology is without risk and without environmental impact. Taking into account the quantifiable risks of loss expenses in case of accidents the study shows that the health hazards and economical risk are by trend about equal for nuclear power and renewable energy sources. The study is based on the statement that the severe accident in Fukushima-Daiichi cannot be ascribed to so-called remaining risk since the NPP was not designed for tsunamis of the size that occurred in 2011 although this size was of high probability and that the calculated very low probabilities for severe accidents in German nuclear power plants correspond to the reality.
[en] The generation of electricity in Brazil is concentrated in hydroelectric generation, renewable and clean source, but that does not satisfy all the demand and leads to necessity of a supplementary thermal sources portion. Considering the predictions of increase in demand for electricity in the next years, it becomes necessary to insert new sources to complement the production taking into account both the volume being produced and the needs of environmental preservation. Thus, nuclear power can be considered a potential supplementary source for electricity generation in Brazil as well as the country has large reserves of fissile material, the generation emits no greenhouse gases, the country has technological mastery of the fuel cycle and it enables the production of large volumes of clean energy. The objective of this study is to demonstrate the potential of nuclear energy in electricity production in Brazil cleanly and safely, ensuring the supplies necessary to maintain the country's economic growth and the increased demand sustainable. For this, will be made an analysis of economic and social indicators of the characteristics of our energy matrix and the availability of our sources, as well as a description of the nuclear source and arguments that justify a higher share of nuclear energy in the matrix of the country. Then, after these analysis, will notice that the generation of electricity from nuclear source has all the conditions to supplement safely and clean supply of electricity in Brazil. (author)
[en] In 2007, more than $100 billion was invested in new renewable energy capacity, manufacturing plants, and research and development-a true global milestone. Yet perceptions lag behind the reality of renewable energy because change has been so rapid in recent years. This report captures that reality and provides an overview of the status of renewable energy worldwide in 2007. The report covers trends in markets, investments, industries, policies, and rural (off-grid) renewable energy. (By design, the report does not provide analysis, discuss current issues, or forecast the future.) Many of the trends reflect increasing significance relative to conventional energy
[en] Changes in renewable energy markets, investments, industries, and policies have been so rapid in recent years that perceptions of the status of renewable energy can lag years behind the reality. This report captures that reality and provides a unique overview of renewable energy worldwide as of early 2010. The report covers both current status and key trends. By design, the report does not provide analysis, discuss current issues, or forecast the future. Many of the trends reflect the increasing significance of renewable energy relative to conventional energy sources (including coal, gas, oil, and nuclear). By 2010, renewable energy had reached a clear tipping point in the context of global energy supply. Renewables comprised fully one quarter of global power capacity from all sources and delivered 18 percent of global electricity supply in 2009. In a number of countries, renewables represent a rapidly growing share of total energy supply-including heat and transport. The share of households worldwide employing solar hot water heating continues to increase and is now estimated at 70 million households. And investment in new renewable power capacity in both 2008 and 2009 represented over half of total global investment in new power generation. Trends reflect strong growth and investment across all market sectors-power generation, heating and cooling, and transport fuels. Grid-connected solar PV has grown by an average of 60 percent every year for the past decade, increasing 100-fold since 2000. During the past five years from 2005 to 2009, consistent high growth year-after-year marked virtually every other renewable technology. During those five years, wind power capacity grew an average of 27 percent annually, solar hot water by 19 percent annually, and ethanol production by 20 percent annually. Biomass and geothermal for power and heat also grew strongly. Much more active policy development during the past several years culminated in a significant policy milestone in early 2010-more than 100 countries had enacted some type of policy target and/or promotion policy related to renewable energy, up from 55 countries in early 2005. Many new targets enacted in the past three years call for shares of energy or electricity from renewables in the 15-25 percent range by 2020. Most countries have adopted more than one promotion policy, and there is a huge diversity of policies in place at national, state/provincial, and local levels. Many recent trends also reflect the increasing significance of developing countries in advancing renewable energy. Collectively, developing countries have more than half of global renewable power capacity. China now leads in several indicators of market growth. India is fifth worldwide in total existing wind power capacity and is rapidly expanding many forms of rural renewables such as biogas and solar PV. Brazil produces virtually all of the world's sugar-derived ethanol and has been adding new biomass and wind power plants. Many renewables markets are growing at rapid rates in countries such as Argentina, Costa Rica, Egypt, Indonesia, Kenya, Tanzania, Thailand, Tunisia, and Uruguay, to name a few. Developing countries now make up over half of all countries with policy targets (45 out of 85 countries) and also make up half of all countries with some type of renewable energy promotion policy (42 out of 83 countries). The geography of renewable energy is changing in ways that suggest a new era of geographic diversity. For example, wind power existed in just a handful of countries in the 1990s but now exists in over 82 countries. Manufacturing leadership is shifting from Europe to Asia as countries like China, India, and South Korea continue to increase their commitments to renewable energy. In 2009, China produced 40 percent of the world's solar PV supply, 30 percent of the world's wind turbines (up from 10 percent in 2007), and 77 percent of the world's solar hot water collectors. Latin America is seeing many new bio-fuels producers in countries like Argentina, Brazil, Colombia, Ecuador, and Peru, as well as expansion in many other renewable technologies. At least 20 countries in the Middle East, North Africa, and sub-Saharan Africa have active renewable energy markets. Outside of Europe and the United States, other developed countries like Australia, Canada, and Japan are seeing recent gains and broader technology diversification. The increasing geographic diversity is boosting confidence that renewables are less vulnerable to policy or market dislocations in any specific country. One of the forces propelling renewable energy development is the potential to create new industries and generate millions of new jobs. Jobs from renewables now number in the hundreds of thousands in several countries. Globally, there are an estimated 3 million direct jobs in renewable energy industries, about half of them in the bio-fuels industry, with additional indirect jobs well beyond this figure. Greatly increased investment from both public-sector and development banks is also driving renewables development, particularly from banks based in Europe, Asia, and South America. The European Investment Bank and the Brazilian Development Bank (BNDES) are notable cases. A number of development banks have increased development assistance flows. Such flows jumped to over $5 billion in 2009, compared with some $2 billion in 2008. The largest providers are the World Bank Group, Germany's KfW, the Inter-American Development Bank, and the Asian Development Bank. Dozens of other development agencies provide growing amounts of loans, grants, and technical assistance for renewables