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FIGURE 5.2 Hourly distributions of photovoltaic electricity production in the Danish Sol300 project.

measurements have been available. The distribution of electricity production derives from the Danish Sol300 project. The project involves 267 PV systems installed in typical one-family houses at eight locations in Denmark beginning in 2000. Distribution data have been provided for two years, as illustrated in Figure 5.2.

For onshore wind power, which has existed in Denmark for many years, the distribution is based on the actual production of wind turbines located in the reference area: West Denmark. Such data have been provided by the TSO (transmission system operator) company of the region. Three years have been analyzed, and the data are shown in Figure 5.3.

Data based on actual measurements are not yet available for Danish wave power. So far, wave power stations in Denmark have existed only as small test facilities. The distribution of wave power is therefore made on the basis of wave measurements in the North Sea off the west coast of Denmark. Distribution data have been provided for two years, as illustrated in Figure 5.4. Lund's article describes in more detail the sources of the data for all three types of RES.

When you look at Figures 5.2, 5.3, and 5.4, two things are obvious. First, the electricity productions from all three types of fluctuating RES evidently differ from one year to another. When comparing a specific hour of the same

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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