Montalto di Castro

Early 2011 – the biggest large-scale PV plant in Europe is in Italy. In Montalto di Castro. The total output: 85 MWp. This is enough to supply a city with a population of about 24,000 with electrical energy around-the-clock. Using solely the power of the sun. In the case of the PV power station in Montalto di Castro this saves 78,000 tonnes of CO2 emissions every year.

In charge of planning and implementation for this mega-project is a number of project planner, one of which is SunRay Renewable Energy, a subsidiary of the US American SunPower. Amongst other things, the company is responsible for the service and maintenance of the plant. In spite of the enormous scale of the PV plant, the operators rely on tracking systems, which increases the energy yield even more.


The development of the plant took place in several stages. In November 2009, the first development phase, with 20 MW, was completed. Further development of the plant has taken place in several stages, before the final phase was completed at the end of 2010. The PV power station covers an area of 283 hectares. For comparison: the principality of Monaco covers an area of approximately 200 hectares. The plant was financed by a consortium of international and Italian banks.


»The large-scale plant in Montalto di Castro has a total power of 85 MW since the end of 2010. This is therefore the largest plant of its kind in the whole of Europe. Partners such as SMA were needed for the successful implementation of this challenging and complex project. In this, we not only rely on prompt delivery. Also quality, efficiency, and the operating efficiency of the products won us over a long time ago. With more than 600 MWp of total power installed, SunPower is one of the most successful companies in the industry. Therefore we also set great store on experience and know-how in the selection of our partners. Because we believe that together we can change the things that will move the world of tomorrow.«

Mario Riello, EMEA Sales Director, SunPower.


  • End 2010

Nominal power

  • 85 MWp


  • Sunpower


  • 124 x SC 630HE


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