Photovoltaic energy cost
For the economic evaluation of photovoltaic for electric energy generation we have to consider the cost of kWp installed, the annual productivity in kWh for the system, the costs of management and maintenance, and the lasting of the system.
The productivity is an amount of electric energy produced in a unit of time ( an hour) during a year for every kWp of installed power or the number of hours in a year that produce a kWp. For example, if a system in South Italy produce 1.500 kWh for every kWp installed, it means that the same system has an hour functioning system of 1.500 hours a year.
In comparison, the Aeolian system has a productivity of 2.000 hours a year or every kW installed generates 2.000 hours a year.
The annual cost of a photovoltaic kWp differs from 5.500 to 7.500 €/kWp, depending on the position, characteristics and size of the plant.
The cost is very high and obviously higher than every other energetic source but if we consider total costs and not only the money costs of potential user, the advantageous are going to be very important.
This is the reason of high incentives for photovoltaic by many countries and for a few years also by Italian government with a mechanism of “ Conto Energia”, that promote not the installation but the running of the plant. In fact,a kWh of energy produced during the period of 20 years are being stimulated.
The management and maintenance costs are of 0,5- 1,0 % a year of the initial cost of the investment.
The photovoltaic system lasts about 40 years with a production that decreases of 0,2- 0,5 % a year.
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