Ammonit
Ammonit
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Innovative measuring technology for the wind industry
since 1989

Case Study: Fortum Wind Measurement Project in Lapland

Wind Measurement Project close to the Arctic Circle


The wind power capacity in Finland is 197 MW, 130 wind turbines (May 2011). Wind power production in 2010 was about 292 GWh, which is 0.3 % of the Finnish electricity consumption. As a comparison: Germany, one of the leading wind power countries, had a wind power capacity of 27.2 GW (21,607 wind turbines) in 2010. The wind power production was about 37,300 GWh, which was 6.2% of the German electricity consumption.

At present Finland produces electricity from hydro, nuclear and thermal power.

  • Conven. thermal power 33.3 TWh
  • Nuclear power 22.5 TWh
  • Hydro power 12.6 TWh
  • Wind power 0.2 TWh

Over the past few years wind power was not particularly promoted by the Finish government. Finland did not use feed-in tariffs, fixed premiums, green certificate systems or tendering procedures. At the beginning of 2011 Finland finally introduced feed-in tariffs for wind power and bioenergy.

Nevertheless the target to increase the share of renewable energy from 28.5 percent in 2005 to 35 percent in 2020 was dropped to 31.5%. According to the „Renewables Global Status Report“ Finland aims to increase renewable energy only by 2 % in 13 years. This objective is among the modest of all EU countries.

However, wind power is the most popular energy resource in Finland. In September 2007 about 90% of the Finish public supported further investments in wind power.

The Project
In 2010 Fortum, which is one of the three largest energy producers in Finland, initiated a wind measurement campaign. A first met mast was planned for Lapland. Fortum is a NASDAQ OMX Helsinki quoted company whose activities cover the generation, distribution and sales of electricity and heat.

Meventus, a Scandinavian service company, which specialises in wind measurement campaigns, won the bid for the project. For about two years Meventus has been part of the global Ammonit partner network. In order to erect met masts, Meventus closely cooperates with Windhunter, which is a consulting and service company that specialises in wind measurement particularly in the installation of professional met masts. Since 2003 Windhunter has been part of the Ammonit partner network.

The Met Mast
The met mast was installed in the region of Kuolavaara-Keulakkopää near Rovaniemi - close to the arctic circle. The region is remote and almost uninhabited. Particular challenges arise from the specific climatic conditions caused by snow and ice. Windhunter erected the met mast and installed the required sensors without using any cranes or heavy machines. A team of industrial climbers built the met mast step by step using hoists to lift each segment.

Based on the arctic conditions, with top wind speed of up to 40m/s as well as cold and snowy winters, the 92m lattice mast is made of more robust material than met masts installed in Central Europe. Occasionally the anchor cables are covered with up to 20cm of snow and ice. In addition to the stronger materials used for the mast construction, Ammonit calculated and distributed special winterproof cables and a heating system to keep not only the sensors but also the booms free of snow and ice. These heating wires are wrapped around each boom.

The Sensors
The met mast is equipped with standard sensors, e.g. anemometers, wind vanes, barometers, as well as humidity and temperature sensors. Wind speed and wind direction are measured at several heights: high, middle and low level. Air pressure, humidity and temperature are measured at two heights to get values at top and low level. In order to acquire further measurement values, Windhunter installed four heated ultrasonic anemometers at top, high, middle and low level - so wind speed and wind direction are measured in parallel.

Noteworthy is an ice sensor which indicates if there are any risks of ice. Finally, 15 sensors have been installed on the met mast which is more than needed for a standard wind measurement campaign with 6 to 10 sensors. Ammonit delivered all of the electrical equipment including sensors, heatings and obstacle lights.

Considering the number of sensors, Ammonit needed to provide two Meteo-32X data loggers to record measurement data and calculate the required statistics.

Power Supply
Compared with a standard wind measurement system, the Fortum system requires significantly more power when the installed heating wires and the number of sensors are considered - especially heated ultrasonics, as well as sensor heating systems. In order to supply the measurement system with the necessary power, it had to be connected to the grid. Since there was no access to the grid available, Fortum installed a medium voltage power line of about 2.5km and a road to the site of the met mast.

In summary, the Fortum project was very ambitious for all partners involved. All partners had to work together closely and reliably to successfully implement such a challenging project. Ammonit, Meventus and Windhunter did this effectively as one team.

fortum-mast fortum-mast-ice fortum-windhunter

www.meventus.com, www.windhunter.com

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