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Moving from principles to action for energy supply that mitigates against climate change requires a long-term perspective. Energy infrastructure takes time to build up; new energy technologies take time to develop. Policy shifts often also need many years to take effect. In most world regions the transformation from fossil to renewable energies will require additional investment and higher supply costs over about twenty years. However, there will be tremendous economic benefits in the long term, due to much lower consumption of increasingly expensive, rare or imported fuels. Any analysis that seeks to tackle energy and environmental issues therefore needs to look ahead at least half a century. Scenarios are necessary to describe possible development paths, to give decision-makers a broad overview and indicate how far they can shape the future energy system.Two scenarios are used here to show the wide range of possible pathways in each world region for a future energy supply system: • Reference scenario, reflecting a continuation of current trends and policies. • The Energy [R]evolution scenario, designed to achieve a set of environmental policy targets. The Reference scenario is based on the Current Policies scenarios published by the International Energy Agency (IEA) in World Energy Outlook 2011 (WEO 2011).45 It only takes existing international energy and environmental policies into account. Its assumptions include, for example, continuing progress in electricity and gas market reforms, the liberalisation of cross- border energy trade and recent policies designed to combat environmental pollution. The Reference scenario does not include additional policies to reduce greenhouse gas emissions. As the IEA’s projections only extend to 2035, they have been extended by extrapolating their key macroeconomic and energy indicators forward to 2050. This provides a baseline for comparison with the Energy [R]evolution scenarios. The Energy [R]evolution scenario has a key target to reduce worldwide carbon dioxide emissions from energy use down to a level of below 4 Gigatonnes per year by 2050 in order to hold the increase in global temperature under +2°C. A second objective is the global phasing out of nuclear energy.The Energy [R]evolution scenarios published by Greenpeace in 2007, 2008 and 2010 included ‘basic’ and ‘advanced’ scenarios, the less ambitious target was for 10 Gigatonnes CO2 emissions per year by 2050. However, this 2012 revision only focuses on the more ambitious “advanced” Energy [R]evolution scenario first published in 2010. To achieve the target, the scenario includes significant efforts to fully exploit the large potential for energy efficiency using currently available best practice technology. At the same time, all cost-effective renewable energy sources are used for heat and electricity generation as well as the production of biofuels.The general framework parameters for population and GDP growth remain unchanged from the Reference scenario. image MAINTENANCE WORKERS FIX THE BLADES OF A WINDMILL AT GUAZHOU WIND FARM NEAR YUMEN IN GANSU PROVINCE, CHINA. This new global Energy [R]evolution scenario is aimed at an even stronger decrease in CO2 emissions, considering that even 10 Gigatonnes – the target of the 2007 and 2008 editions - might be too high to keep global temperature rises at bay. All general framework parameters such as population and economic growth remain similar to previous editions, however the uptake of renewable energies has been accelerated partly based on the latest very positive developments in the wind and solar photovoltaic sectors. Efficiency in use of electricity and fuels in industry and “other sectors” has been completely re-evaluated using a consistent approach based on technical efficiency potentials and energy intensities.The resulting consumption pathway is close to the projection of the earlier editions. One key difference for the new Energy [R]evolution scenarios is incorporating stronger efforts to develop better technologies to achieve CO2 reduction.There is lower demand factored into the transport sector (compared to the basic scenario in 2008 and 2010), from a change in driving patterns and a faster uptake of efficient combustion vehicles and a larger share of electric and plug-in hybrid vehicles after 2025. This scenario contains a lower use of biofuels for private vehicles following the latest scientific reports that indicate that biofuels might have a higher greenhouse gas emission footprint than fossil fuels.There are no global sustainability standards for biofuels yet, which would be needed to avoid competition with food growing and to avoid deforestation. The new Energy [R]evolution scenario also foresees a shift in the use of renewables from power to heat, thanks to the enormous and diverse potential for renewable power. Assumptions for the heating sector include a fast expansion of the use of district heat and more electricity for process heat in the industry sector. More geothermal heat pumps are also included, which leads to a higher overall electricity demand, when combined with a larger share of electric cars for transport. A faster expansion of solar and geothermal heating systems is also assumed. Hydrogen generated by electrolysis and renewable electricity is introduced in this scenario as third renewable fuel in the transport sector after 2025 complementary to biofuels and direct use of renewable electricity. Hydrogen is also applied as a chemical storage medium for electricity from renewables and used in industrial combustion processes and cogeneration for provision of heat and electricity, as well, and for short periods also reconversion into electricity. Hydrogen generation can have high energy losses, however the limited potentials of biofuels and probably also battery electric mobility makes it necessary to have a third renewable option. Alternatively, this renewable hydrogen could be converted into synthetic methane or liquid fuels depending on economic benefits (storage costs vs. additional losses) as well as technology and market development in the transport sector (combustion engines vs. fuel cells). reference 45 INTERNATIONAL ENERGY AGENCY (IEA), ‘WORLD ENERGY OUTLOOK 2011’, OECD/IEA 2011. 4 55 © GP/MARKEL REDONDO scenarios for a future energy supply | SCENARIO BACKGROUNDPDF Image | SUSTAINABLE WORLD ENERGY OUTLOOK
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