How much will the energy service directive contribute to the 20% EU energy savings goal?

The Energy Service Directive (ESD) of the European Union (EU) stipulates that member states realize 9% energy savings for the period 2008–2016. A harmonized calculation approach, consisting of a combination of top-down and bottom-up methods, will be developed to determine the savings of energy efficiency improvement measures. However, it is unclear which part of all realized energy savings is eligible in meeting the ESD target. One can argue that not all savings, especially the autonomous efficiency gains, should be accounted for, but only savings due to (new) policy. An analysis is made of the way the methods can be applied, how baseline choices define the savings and whether these represent policy-induced savings. It is shown that the given target could be met with total energy savings that equal 1.0% of ESD energy use per year, hardly more than realized at present. With other choices, the target is met with total savings of 1.6% per year. The savings found are made comparable with the 2.4% yearly savings derived from the 20% savings target for 2020 formulated by the EU. Given the large gap between ESD savings and the savings target, it is concluded that the methods and baselines used should be chosen such that the ESD target leads to realized savings after 2008 at the upper side of the margin.     

The European renewable energy target for 2030 – An impact assessment of the electricity sector

The European Union set binding targets for the reduction of greenhouse gases (GHG) and the share of renewable energy (RE) in final energy consumption by 2020. The European Council agreed to continue with this strategy through to 2030 by setting a RE target of 27% in addition to a GHG reduction target of 40%. We provide a detailed sectoral impact assessment by analyzing the implications for the electricity sector in terms of economic costs and the regional distribution of investments and shares of electricity generated from renewable energy sources (RES-E). According to the Impact Analysis by the European Commission the 27% RE target corresponds to a RES-E share of 49%. Our model-based sensitivity analysis on underlying technological and institutional assumptions shows that the cost-effective RES-E share varies between 43% and 56%. Secondly, we quantify the economic costs of these variants and those which would be incurred with higher shares. The long-term additional costs for higher RES-E shares would be less than 1% of total system costs. The third aspect relates to the regional distribution of EU-wide efforts for upscaling renewables. We point out that delivering high RES-E shares in a cost-effective manner involves considerably different efforts by the Member States.     

The role of hydrogen and fuel cells to store renewable energy in the future energy network – potentials and challenges

The penetration of renewable energy sources is expected to rapidly increase from 15% to 50% in 2050 due to their vital contribution to the global energy requirements, sustainability and quality of life in economical, environmental and health aspects. This huge rise highlights the necessity of development of energy storage systems, especially for intermittency renewable energies such as solar photovoltaic and wind turbine, in order to balance the energy network. In this study, renewable energy options including pumped hydro, pressurized air, flywheels, Li ion batteries, hydrogen and super-capacitors are compared based on a specific set of criteria. The criteria considered are energy/power density, ease of integration with the existing energy network, cost effectiveness, durability, efficiency and safety. Our study showed that storing renewable energy sources in the form of hydrogen through the electrolysis process is ranked as the most promising option considering the mentioned criteria. It brings about several benefits suggesting that hydrogen and fuel cells are promising contributors towards a more sustainable future, both in energy demand and environmental sustainability.