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Building Information Modeling/ Virtual Design & Construction
In the town of Rätan in Sweden’s Berg Municipality, Skanska is hard at work on the construction of Mullberg Wind Farm. The project is a collaboration between Skanska and Jämtkraft. Once fully operational, Mullberg Wind Farm will comprise 26 wind turbines with the combined capacity needed to supply approximately 45,000 households with electricity each year.
The wind farm is located in the hills surrounding Mullberget, where the annual average wind speed is seven meters per second. The wind turbines, which produce electricity at four meters per second, are expected to generate an annual production of approximately 247,000,000 kilowatt-hours.
Work on the wind farm began in the summer of 2012 with the construction of new roads and reinforcement of the existing roads leading to the wind farm, followed by the clearing of forest land in the area. Throughout the project, we have been careful not to clear more trees than was absolutely necessary.
Our goal is for Mullberg Wind Farm to be built and operated in harmony with nature and we hope that the project will serve as a model for how to create renewable energy in a sustainable and cost-efficient manner.
Once completed, the wind farm will comprise a total of 26 Siemens SWT 113-3.0 MW turbines with a maximum total height of 180 meters. Construction is expected to be completed in spring 2014, at which point electricity production can commence.
2012July: Reinforcement of roads leading to the worksite. September: Geotechnical investigation. Site establishment. Project engineering for foundations. October: Cable and transformer work. November: Foundation work begins.
2013 March: Foundation, electricity and transformer work continues. April: Work on service building begins.June: Transformer building and service building completed. July: Roadwork completed. Turbine deliveries begin. August: Foundation work completed. Electrical work completed. Installation of turbines begins. December: All towers installed.
2014 Spring: Turbine blades assembled. Electricity production begins.
Lotta Lagerstedt+46 10 44 83 199
Mejl Lotta Lagerstedt
Verksamhetsgren: Construction, Public Private Partnerships
Sustainability issues have been a top priority during the work on Mullberg Wind Farm. The vision is for the wind farm to be built and operated in harmony with nature and for the project to serve as a model for how to create renewable energy in a sustainable, cost-efficient and profitable manner.
Once completed, the wind farm will supply 50,000 households with green electricity over the coming 25 years. Green electricity plays an important role in reducing carbon emissions.
Our goal throughout the project has been to minimize our environmental impact and the wind farm has been classified as a green worksite according to Skanska’s ISO 14001 certification. This means that we are expected to meet strict requirements with respect to emission levels, energy-efficient lighting, chemical use and garbage sorting.
We have also aimed to use local labor. A total of about 100 employees have been involved in the project, most of whom are from the local area. Once complete, the wind farm will create approximately ten full-time positions.
Skanska is building Mullberg Wind Farm in cooperation with Jämtkraft. Mullberg, located near the town of Rätan in Sweden’s Berg Municipality, will be one of the largest wind farms in the Jämtland region. The wind farm is expected to produce approximately 247,000,000 kilowatt-hours annually.
The project is a true collaboration – from financing to construction and operation. Jämtkraft has extensive experience when it comes to electricity production, electricity trading and electricity networks, while Skanska has contributed expertise in construction and project engineering.
The plans to build a wind farm in Mullberget have been in the works for a number of years. Back in 2009, Svenska Vindbolaget conducted a preliminary study for a wind farm in the area. A permit application was submitted in 2010 and approved in 2011.
In September 2012, Skanska Infrastructure Development and Jämtkraft acquired Mullbergs Vind AB and the real work could begin.
The worksite is located near the E45 motorway, which serves as a convenient transport route for equipment and deliveries. Once off the E45, however, we were forced to reinforce old roads and build new roads leading to Mullberget. In conjunction with the beginning of roadwork, we also connected the worksite to the nearest power plant to ensure a connection to the national electricity grid. Clearing of the worksite began in the autumn of 2012.
Work on the foundations for the 26 wind turbines began in November. In order to reduce the amount of concrete and reinforcements needed, the foundation was cast in an annular form, which was later filled with gravel. This enabled us to use less concrete and thus reduce the total level of carbon emissions by a full 30 percent.
Thanks to a mild winter with very little snow, we were able to continue working during the winter months of 2012 and successfully completed the necessary electrical work and laying of cables.
The 26 foundations were completed in the summer of 2013 and Siemens, which is responsible for the wind turbines, was able to start raising the towers.
Safety is always a top priority in our projects and the work on Mullberg Wind Farm is no exception. From the very beginning of the project, the issue was emphasized in our contacts with employees in order to make everyone aware of the risks associated with constructing a wind farm. Our vision during the project was zero worksite accidents.
Mullberg Wind Farm is expected to be completed in the spring of 2014, at which point it will have the capacity to supply 50,000 households with green electricity for the coming 25 years.