The problem of additionality
Green electricity sold by utility companies is a peculiar product. It guarantees the origin of your power, just like an ethical investment fund guarantees the origin of your profit, but what is the solid evidence for such a guarantee?Read full article
A.F. Picanço, C de Salles, M.L.B. Martinez, P.C. Rosa, H.R.P.M. de OliveiraRead full article
$4 billion investment required
Ocean power is still a minor in the renewable energy sector. It consists mainly of wave power and tidal stream power, and both technologies have only just embarked on their first commercial projects. Today, less than 10 MW of ocean power capacity has been installed.Read full article
A voltage dip is a Power-Quality phenomenon, often caused by short circuits in the electricity grid, in which the supplying voltage decreases during a short period of time (typically <2s). Some process components, such as variable speed drives and computers, are extremely sensitive to such dips, which may result in a complete process outage.Read full article
This Application Note aims at describing the use of energy and the potential energy savings in the hotel sector, on the basis of theory and practical case studies. Hotels and restaurants represent some 9% of total energy consumption in the utility buildings sector. Utility buildings are offices, shops, hotels, restaurants, educational establishments and care institutions.Read full article
A new training package on “Sustainable Energy Regulation and Policymaking for Africa” is now freely available via the REEEP website. Developed by UNIDO with contributions from a number of organisations, and co-funded by REEEP, it provides an introduction to the key issues relating to the energy market and energy regulation as they affect sustainable energy.Read full article
Several European countries have a policy to encourage the development of renewable en-ergy sources. This is identified in e.g. the European green paper Energy strategy for a sus-tainable, competitive and secure energy supply (March 2006). In the transition towards a European sustainable energy system for the future and to reduce the dependency of im-ported primary energy sources such as oil and gas, the development of offshore wind power is an essential element.Read full article
The EU is banning the use of incandescent lamps. Replacing an incandescent bulb by a compact fluorescent lamp (CFL) does indeed save around 75 % of the energy consumed. But how feasible is it to try and replace all existing incandescents by CFLs? Are today’s CFLs up to the job, or are technical improvements still required? And what about the alternatives? Are there any other light sources of equally high-efficiency as CFLs but without the disadvantages?
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A recent report from IEA explores how variable renewables can be integrated on a large-scale into the electricity system.
The report proposes to replace the term 'intermittency' with 'variability'. Calling renewables intermittent is misleading, since wind or solar power do not drop from full power to zero and vice versa - they are available at some level much of the time, and ramp up or down following gradients dictated by weather.Read full article