Intermittent Generation on the Electricity Market

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Sőrés Péter Márk
Department of Electric Power Engineering

Nowadays, the market of electricity is changing. Traditional (conventional) producers start to lose their dominance. Instead of the traditional producers, new methods of electrical productions appear. The application of the renewable energy is preferred worldwide rather than the exhaustion of the Earth’s energy reserves. Most of the renewable energy resources — especially those depending on the weather — are originated from the radiation of the Sun. The other types of renewable energy are from the tidal movements of the sea caused by the Moon or the physical characteristics of the Earth (geothermal energy, gravitational field e.g. in case of a hydroelectric power station).

The usage of weather-dependent energy has several advantages and disadvantages. One of the advantages is that the operation of weather-dependent producers has low variable costs. On the other, the levelised cost of investment is rather high, which is one of the disadvantages of weather dependent resources. Furthermore, the production of weather-dependent energy cannot be continuous as it relies on the weather. Thus, it is more difficult to plan the amount of the produced energy — in case of those renewable energy sources which depends on the weather — than the quantity of those produced in traditional power plants. Another disadvantageous result of the discontinuous generation of weather-dependent energy that the amount of regulation reserves must be increased. Finally, the low costs of the renewable energy’s production may push the traditional producers to the reserve market or even to shut down completely.

Among the weather-dependent resources, the solar energy provides the most calculable production function. In the case of solar energy production, the amount of created energy can be quite accurately planned for example compared to wind power production. During each year, the solar generation contribute to the production of energy in distinguished but determinable way. The photovoltaic modules are easily located; as a result, it can be set up on such built-up places like on the roof of a house. Therefore, solar energy modules can produce energy extremely near to the consumers.

The newly introduced regulations that leads to the planned investment to power stations, the number of renewable and weather-dependent energy modules seems to be heightened. In this thesis, the alternation of the power exchange price is discussed as a consequence of the solar power stations’ expansion.

According to the different seasons, the power exchange price became varied. The most outstanding result was found in the spring, to be precise in April. In this month, regarding a whole day, there were 1.5 – 6% shrinkage in the exchange price, in the different cases. The largest changes between the hours reached a 10% and 27% reduction.


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