The Waste and Energy Consortium of Menorca, promoter of the “Feasibility study to determine the strategy for the development and implementation of a global electricity generation project“, presents the results of the work carried out in recent months by Rubén Diego Carrera, corporate director of INGECID, the company in charge of the technical development of the consultancy service.
The objective is to carry out a feasibility study to determine the strategy for the development and implementation of a global electricity generation project using different potential sources: wind, solar photovoltaic and biogas. Always thinking in the medium and long term.
Rubén Diego explains: “Our objective is to provide the Consortium with quality information that will provide it with support for strategic decision making regarding the potential development of a project to improve/expand the current Es Milá wind farm, as well as the possibility of implementing a solar farm on an adjacent site, specifically at the Milá 1 and Milá 2 landfills, where the implementation of a plant for the recovery of organic waste with the use of biogas is foreseen in the future”.
The project under analysis is located to the north of the town of Mahón. The Es Milá wind farm, which has four wind turbines of 800 kW each, is currently in operation. Annexed to the wind farm is the solid urban waste landfill and the plant for the recovery of this waste by means of composting.
The current evacuation of the energy generated in the wind farm is carried out at medium voltage, with problems of grid saturation.
The evaluated project consists of the repowering of the wind farm, the erection of a solar photovoltaic plant and the construction of an energy evacuation line.
Infographic with an overview of the performance. FUENTE: INGECID
With regard to the repowering of the Es Milá wind farm, two alternative scenarios are envisaged, with two different power ratings and technological solutions to replace the current wind turbines. The first consists of the installation of two wind turbines of 2MW each. The second consists of the installation of two wind turbines of 3MW each.
As for the solar photovoltaic implementation, the same criterion has been adopted, two alternative scenarios with different installed capacity sizes. One option is to install 20,550 polycrystalline solar modules of 330 Wp of unit power on the Milá 1 and Milá 2 landfills; and the other alternative consists of installing 11,058 solar panels occupying only the Milá 1 landfill, which is completely closed and currently being used.
In any case, it will be necessary to build a new evacuation line for the energy generated, as the current infrastructure does not have sufficient capacity. Always considering an underground line, 3 possible evacuations are envisaged. An evacuation line to the current electrical substation of Dragonera (REE) with a distance of 6.4 km; an evacuation line to the private substation that the company ENDESA has in the port of Mahón with a distance of 5.2 km, or an evacuation line to a newly built substation, located on a free site currently owned by the Consell Insular de Menorca, with a distance of 3.7 km.
With all this, 12 alternative scenarios are analysed. For each alternative, a feasibility analysis is carried out by calculating the Net Present Value (NPV), Internal Rate of Return (IRR) and Payback Period (PAYBACK) indicators, with a time horizon of 30 years and a discount rate of 4%.
As a result of the analysis, an ordered ranking is obtained that indicates which are the best alternatives. The best option found involves the installation of 2 wind turbines of 3MW, 20,550 solar modules, with the evacuation line to Endesa’s installations; obtaining an NPV of 2,429,195.47 € (30 years), an IRR of 5.33% and a PAYBACK of 15.7 years.
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