Mini-wind systems

In order to win the challenge against the climate changes that are currently taking places, it is necessary to use energy rationally and to learn how to produce it using mainly renewable sources, the only ones that can give us clean energy. The wind energy can be used not only by large-scale installations but also by small-scale ones. In fact, there are solutions purposefully developed for the so called “distributed” generation which uses small-scale generators to supply energy to isolated users or to insert it to the low/medium voltage grid.

The term “mini-wind” designs the production of electric energy from a wind source using generators up to 25-metre high. The difference between mini-wind and large wind systems is clear and significant. Large-scale wind systems are an alternative to large thermoelectric stations using fossil fuels which have a negative “visual” impact and occupy large territories. Small-scale wind systems, instead, have little or no impact and no interferences with the territory and can be used by a single household, agricultural activities, service or manufacturing SMEs.

Micro and mini wind systems feature two technologies: a vertical axis rotor and a horizontal axis rotor. The first type is indicated for urban and suburban installations since it has a reduced visual impact and the level of sound emissions is low (beneath the maximum threshold of 60db as per law). The second type obtains maximum energy production in open spaces with low-growing vegetation, so it is particularly suitable for extra urban surroundings where it can serve farms and service or manufacturing SMEs.


  • Installations connected to the LV/MV electricity grid
  • “Stand alone” installations for isolated users
  • Installations for water heating
  • Installations activating pumps for water lifting
  • Hybrid photovoltaic/wind installations


Mini-wind systems, due to their simple technology and low costs, are nowadays a valid alternative to the traditional method for the production of energy. Its advantage is that of using an easily available source, especially in territories like Southern Apennines with medium or high wind levels (between 5 and 8 m/s).

(Law n. 244 del 24/12/07, Implementing Decree of 18/12/2008)

  • powers up to 60 kW are only subjected to D.I.A
  • on-site exchange extended up to 200 kW
  • all inclusive feed-in tariff: 0,30 euro/kWh

The payback period mostly depends on wind speed of the site. In an averagely windy site, such as most of the sites in Southern Apennines, the average wind speed is more than 5 m/s, which gives the payback period that goes from 5 to 8 years (that is shorter than an average payback period for photovoltaic systems estimated in 9 years).

Taking advantage of the wind resource can be an opportunity not only for saving money, but also for an additional income in case of private citizens. Thanks to the state subsidies put in place through Finanziaria 2008, the installation of a mini-wind system can be compared to a financial investment paying back at 15% net.  Public administrations can use this solution as well, thus remarkably reducing public expenditure in favour of their communities.

Due to a highly positive experience we have had with the photovoltaic technology in the last few years, today Selettra is extending its offer to a “turnkey” supply of small-scale wind installations. Our technological solutions are destined for households, agricultural activities, service or manufacturing SMEs, public administrations and their aim is to save money and create an additional income.


  • No polluting emissions
  • No or little impact on the territory
  • Can be integrated with other RES
  • Possibility of state subsidies
  • Short investment payback period   
  • Saving and income supplement best odds.

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