OFFSHORE WIND FARMS SELECTED PROJECT REFERENCES FOUNDATIONS FOR 3 OFFSHORE WIND FARMS SELECTED TURBINE FOUNDATION DESIGN PROJECTS
CHANGHUA OWF - PHASE 1 DETAILED DESIGN - JACKETS RENTEL OWF - DETAILED DESIGN - MONOPILES COUNTRY COUNTRY Taiwan The Changhua Pilot TPC OWF is an offshore wind farm of 110 MW. The site Rentel NV has developed an offshore wind farm approximately 32 km off Belgium is located 7.6 km off the west coast of Taiwan at Changhua County, and will Zeebrugge and 42 km from Ostend, located between Northwind OWF on PERIOD PERIOD 2018-2019 cover an area of 11 km2. Water depths at the site range between 18 and 28 m the Lodewijkbank and Thornton OWF on Thornton Bank, with water depths 2015-2017 TWVD. The Changhua Pilot TPC OWF is planned to be installed in 2020 and between 22 and 32 m LAT and sand dunes of 5 m in height. The farm has a CUSTOMER CUSTOMER Jan De Nul NV commissioned in 2021. After establishing a design basis, COWI carries out capacity of 309 MW with turbines with a capacity of 7 MW. COWI carried out the DEME/Geosea RECIPIENT the detailed design of a 4-legged steel jacket structure. The design comprises detailed design of the monopile foundations. RECIPIENT TaiPower hydraulic design, scour assessment, geotechnical design, primary and Rentel NV secondary steel and corrosion protection design. Design loads also consider earthquakes and typhoons.
FORMOSA I OWF - DETAILED DESIGN - MONOPILES COUNTRY Foundation design for Taiwan’s first offshore wind farm, Formosa 1. Taiwan is Taiwan JACKET DESIGN - DETAILED DESIGN aiming at 600 MW offshore wind capacity by 2020 and 3 GW by 2030, and this COUNTRY PERIOD Taiwan COWI’s services comprised design of up to 60 jacket foundations for an project is the beginning of the offshore wind industry in Taiwan. In 2014-2015, 2014-2015 offshore wind farm in Taiwan. The services include geotechnical engineering COWI developed the detailed design of the first two monopile structures to be PERIOD CUSTOMER/RECIPIENT 2018-2019 and structural design of substructure including design for typhoons and equipped with 6.0 MW turbines, and a FEED (front end engineering design) Swancor Enterprise Inc. seismic activities. CUSTOMER study for tendering a design-build contract for another 34 locations. Confidential
HORNS REV 3 & KRIEGERS FLAK AC OFFSHORE SUBSTATION COUNTRY MERKUR OWF - DETAILED DESIGN - MONOPILES Horns Rev 3 and Kriegers Flak, 2x400 MW substations and 1x200 MW COUNTRY Denmark Offshore wind farm in the German part of the North Sea with up to 80 ALSTOM substation. Concept study of 400 MW and 200 MW topside structure, detailed Germany PERIOD Haliade 150 turbines. COWI’s services comprised detailed design of monopile design of 400 MW and 200 MW substation, detailed design of foundations PERIOD 2013-2014 and structures, design review, equipment layout and 3D design, project 2015-2018 foundations for offshore wind turbines, viz. design of primary steel design CUSTOMER for monopole and transition piece, geotechnical design, hydrodynamic load management, tendering and transport and installation design. Also process Energinet.dk CUSTOMER DEME GeoSea NV calculation, scour protection, corrosion protection, low voltage design, and ship design, supply systems and mechanical installation as well as piping, HVAC, RECIPIENT accommodation, electrical installations, instrumentation and SCADA, fire and Energinet.dk RECIPIENT collision friendliness analysis. EnBW safety, communication.
HOHE SEE OWF - DETAILED DESIGN - MONOPILES WIKINGER - DETAILED DESIGN - JACKETS COUNTRY COUNTRY Germany 71 Siemens 7 MW turbines on monopile foundations. Offshore wind farm with 70 jacket foundations for 5 MW turbines installed in the Germany Water depth is 38.6-40.1 m. COWI’s services comprised detailed design of German sector of the Baltic in water depths of 36 to 42 m. COWI A/S, in joint PERIOD PERIOD 2015-2019 foundations, geotechnical design, calculation of wave loads for the integrated venture with IMS, carries out the design of the foundations and transition pieces. 2012-2018 load analysis, individual monopile design for all locations, pile drivability Services rendered by COWI: Project management, geotechnical engineering, CUSTOMER CUSTOMER/RECIPIENT GeoSea NV assessment, design of internal and external secondary structures, external detailed design of foundations and transition pieces incl. secondary steel. Iberdrola Renovables Offshore Also ship collision analyses, HSE management, risk management, interface Deutschland GmbH RECIPIENT and internal LV equipment, impressed current corrosion protection, grouted EnBW connections and ship collision analysis. management, quality management, and options for fabrication and installation support services. FOUNDATIONS FOR 5 OFFSHORE WIND FARMS
DANTYSK OWF - DETAILED DESIGN - MONOPILES ORMONDE OWF - DETAILED DESIGN - JACKETS COUNTRY COUNTRY Germany The DanTysk offshore wind farm is located in the German North Sea 75 km Ormonde is an offshore wind farm located in the Irish Sea, around 10 km from United Kingdom from the island of Sylt. 80 Siemens 3.6 MW turbines are installed on monopile the coast at Barrow-in-Furness in the north-west of the UK. It is innovative in PERIOD PERIOD 2012-2013 foundations at depths ranging from 17 to 31 metres. It was one of the first many respects: 2008-2009 full-scale commercial OWF’s approved under the German BSH approval CUSTOMER ››First commercial deployment of one of the world’s largest ‘market-ready’ wind CUSTOMER Aarsleff Bilfinger Berger JV system. The monopiles have a diameter of 5.8 metres, and a grouted cylindrical turbines, the 5 MW REpower OWEC Towe RECIPIENT connection to the transition pieces with shear keys. The monopiles are equipped ››First commercial use of steel jacket foundations fabricated in Scotland RECIPIENT DanTysk with internal cabling, steel working platforms and scour protection. ››Longest ‘single-pull’ electricity export cable installation in UK waters (42 km) Vatenfall COWI’s services comprised detailed structural design of 30 jacket foundations.
THORNTON BANK OWF - DETAILED DESIGN - JACKETS COUNTRY nd rd Belgium The 2 and 3 phase of the Thornton Bank project are the industrial phases ALPHA VENTUS OWF - DETAILED DESIGN - JACKETS following the first, pilot phase. Phase 2 and 3 consisted of 48 5 MW Senvion COUNTRY PERIOD Alpha Ventus was first German offshore wind farm. The construction phase was Germany 2010-2011 turbines, 24 in each concession sub-area. The wind turbines are installed on just 12 months, a pioneering feat in a location with a water depth of about jacket foundations. COWI’s services comprised detailed design of the 48 jacket PERIOD CUSTOMER 30 m and a distance from the coast of 60 km. Alpha Ventus operates two types 2007-2009 OWEC Tower foundations for REpower 6 MW turbine. The services included structural design of wind turbines with two foundation designs, jackets and tripods. The output of CUSTOMER RECIPIENT of primary and secondary steel. the wind farm is 60 MW. COWI’s services involved detailed structural design of OWEC Tower C Power six jacket foundations. The jacket foundations are designed for the REpower RECIPIENT 5 MW turbine and based on BSH regulations. DOTI
LONDON ARRAY OWF - DETAILED DESIGN - MONOPILES COUNTRY United Kingdom With 175 monopiles, designed to carry Siemens 3.6 MW turbines, in total THORNTON BANK OWF PHASE 1 - DETAILED DESIGN - GBF 630 MW, London Array is the largest operational offshore wind farm in the COUNTRY PERIOD Detailed design of six offshore gravity foundations for 5 MW RePower wind Belgium 2010-2012 world. Monopiles of 4.7 m and 5.7 m in diameter were installed in water depths turbines, set in 21 to 27 m of water depth some 30 km from the coast. COWI’s between 0 m and 25 m. With a total length of up to 85 m, these foundations PERIOD CUSTOMER detailed design of foundation structures and appurtenances comprised 2006-2007 Aarsleff | Bilfinger Berger JV range among the largest ever built. The contractor Aarsleff Bilfinger Berger Joint structural, geotechnical and hydrodynamic design as well as installation analysis, CUSTOMER RECIPIENT Venture (ABJV) engaged COWI as lead in a joint venture with IMS to carry out programming and analyses of mathematical and physical modelling of shear leg Dredging International London Array Limited the detailed design of the steel foundations. COWI’s services comprised detailed movements and sling forces during transport and installation. structural design of 175 monopiles with appurtenances, detailed geotechnical design for 175 locations and detailed hydraulic design.
NYSTED OWF - DETAILED DESIGN - GBF COUNTRY Detailed design of gravity foundations for 72 wind turbines and one transformer Denmark RØDSAND II OWF - DETAILED DESIGN - GBF (OSS) located 9-10 km from the coast in the southern part of Denmark. The total COUNTRY PERIOD Denmark An offshore wind turbine park with 90 wind turbines has been built with turbines production capacity of the wind farm is about 480 GWh. The wind turbines are 2000-2001 placed on ballasted caissons in 5 to 12 m water depth. COWI’s services 68.5 m high and founded at 7.5 m - 12.75 m depth. PERIOD CUSTOMER 2008-2011 comprised establishing a design basis on the basis of the owner’s design COWI carried out the structural design, geotechnical design, design of scour Per Aarsleff A/S basis, basic design of the foundation structure to the level defining concrete CUSTOMER protection and evaluation of limiting wave conditions for the operation of placing Aarsleff - Bilfinger-Berger Joint dimensions, detailed structural design of the 90 gravity foundations, structural the foundations on the seabed. Hydraulic model testing was carried out in Venture design – construction and installation forces (IBDAS model), geotechnical connection with scour design and evaluation of the motion of the laying barge RECIPIENT design determining bearing capacity, overturning capacity, sliding capacity and exposed to waves. Project follow-up in the construction phase. EON Vind Sverige foundations, and soil reaction, hydraulic design including hydrodynamic loads and design, determination of ice forces, scour protection design and detailed design of appurtenances. FOUNDATIONS FOR 7 OFFSHORE WIND FARMS SELECTED TENDER DESIGN
BORSSELE III & IV - TENDER DESIGN WIKINGER OSS - TENDER DESIGN COUNTRY COUNTRY Netherlands 680 MW total capacity. The scope of work included design basis, primary steel Conceptual structural and electrical design of an offshore substation for the Germany design including load iteration with turbine supplier, secondary steel design, Wikinger Offshore Wind Farm, located in the German sector of the Baltic PERIOD PERIOD 2016-2017 geotechnical design, scour protection design including analyses of sand waves, Sea. The capacity is in the 400-600 MW range. The conceptual design is 2012-2013 corrosion protection strategy, design of low voltage systems. carried out in joint venture with IMS, with COWI as the lead partner. COWI’s CUSTOMER CUSTOMER DEME services comprised conceptual structural design of topside and electrical Iberdrola Ingeniería y Construcción design including conceptual design layout, mechanical systems, main electrical equipment, communication systems, electrical (low voltage) systems, and conceptual design safety.
NORTHER OWF - FEED COUNTRY Belgium DEME bid for the design-build contract for the Norther offshore wind farm, with 44-58 6-8 MW turbines (150 m rotor diameter) on monopile foundations on KENTISH FLATS PHASE 2 - TENDER DESIGN PERIOD COUNTRY 2015-2016 20-35 m water depth off the coast of the Vlanderen region in Belgium. A joint Phase 2 is an extension of Kentish Flats OWF located in the outer Thames UK venture of Technum (lead), COWI A/S and TDA carried out a FEED for DEME. Estuary. It is planned to include 16 or 17 Vestas 3.0 MW V112 generators CUSTOMER PERIOD Dredging International & GeoSea The contract was eventually awarded to DEME’s competitor. installed on monopiles. Water depths range between 3.8 m and 5.0 m LAT. 2012-2013 Soil conditions are relatively uncomplicated and show a consistent trend below CUSTOMER 8 m corresponding to London Clay. Mobile sand banks are present. Per Aarsleff A/S Tender design of monopile foundation structures. The tender design included primary structural steel and secondary steel, such as boat landing structure, work platform and transition piece. Two alternative monopile concepts were considered; one with a bolted transition piece and one without a transition piece. ST. NAZAIRE & COURSEULLES OWF - TENDER DESIGN COUNTRY Belgium Two offshore wind farms off the coast of France: Courseulles-sur-Mer has 75 Alstom Haliade 150 6 MW wind turbines on monopile foundations. Saint-Nazaire PERIOD 2015-2017 OWF has 80. COWI’s services comprised tender design of monopile foundations for the two offshore wind farms. CUSTOMER ARCADIS OST 1 - PRELIMINARY DESIGN Eiffage Construction Métallique COUNTRY 60 Nordex 6 MW wind turbines at 40-46 m water depths. COWI, in JV with IMS, Germany prepared the feasibility and preliminary design of two types of jacket foundations PERIOD for both the wind turbines and the offshore substation (OSS) including OSS 2012-2012 topside structure. COWI conducted the metocean study for the park area and CUSTOMER a joint probability analysis of wind speed vs. wave height, wind speed vs. water KNK Wind GmbH level and wave height vs. water level.
FÉCAMP GBF - TENDER DESIGN COUNTRY France Gravity based foundation for 83 Alstom Haliade 6 MW turbines at water depths from 26 to 33 m. COWI supplied a review of geotechnical background data, PERIOD 2015-2016 establishment of own soil parameters, geotechnical and structural design, gravel bed and scour protection design, corrosion protection design of foundation and CUSTOMER VCGP-SDI appurtenances, assessment of temporary phases and concept study of jacket alternative. FOUNDATIONS FOR 9 OFFSHORE WIND FARMS OTHER SERVICES
KRIEGERS FLAK OWF - GEOTECH STUDY STORGRUNDET OWF COUNTRY COUNTRY Denmark Offshore wind farm located 15 km east of the Danish coast in the southern Storegrundet Offshore AB is developing an offshore wind farm east of the island Sweden part of the Baltic Sea with a capacity of 600 MW. The number of turbines will Storjungfrun located southeast of the town Söderhamn in Sweden. COWI’s PERIOD PERIOD 2014-2014 between 60 and 200. The site area of 250 km² encircles the bathymetric high services comprised preliminary design basis, specifying applicable standards, 2012-2013 called “Kriegers Flak” with water depth between 16 and 30 m. The options wave, wind and current climates, water levels, ice conditions, soil conditions, CUSTOMER CUSTOMER Per Aarsleff A/S are driven monopiles, gravity based structures, jackets or suction buckets. environmental conditions and ship impacts for the design of the foundations. Storgrundet Offshore AB COWI’s services comprised preliminary review and assessment of available geotechnical data to determine the suitability of ground conditions for gravity based foundations.
WIKINGER YARD HANDLING SUURHIEKKA OWF COUNTRY COUNTRY Denmark/Germany The four-legged jacket foundations for Iberdrola’s Wikinger offshore wind farm The Suurhiekka Offshore wind farm is located in the Bothnic Bay, Finland, in an Finland have been fabricated at Bladt’s site at Lindø and are to be upended and loaded ice prone region in 3-15 m water depth exposed to breaking waves. The wind PERIOD PERIOD 2015-2016 onto barges for transport to the site. The foundations are approximately 65 m tall farm comprises 80 3 MW offshore wind turbines and two substations totalling 2012-2013 and weigh 650 tons each. COWI supported Bladt Industries during fabrication 240 MW installed power. COWI’s services comprised preparation of a metocean CUSTOMER CUSTOMER Bladt Industries A/S of the jacket foundations which were designed by COWI. COWI has verified the study and preliminary design basis. The metocean study included MIKE21 wave Suurhiekka Offshore Oy structural integrity of the jacket during the upending operation and the structural and current modelling with subsequent analysis of results. External description of integrity of the existing support pipes. wind conditions, ice conditions and geotechnical conditions were included in the preliminary design basis.
SCOUR ENGINEERING SERVICES FOR OFFSHORE WIND PROJECTS COUNTRY Denmark On a staff secondment basis, support of all offshore wind projects under SECONDMENTS FOR TECHNICAL ADVISORY IN OWF development by DONG Energy Wind Power, as well as existing offshore wind COUNTRY PERIOD DEVELOPMENT PROJECTS 2013-2015 farms owned by DONG Energy Wind Power. COWI’s services comprised scour USA, Australia, United Kingdom and Denmark engineering services: Establishing design basis, design methodologies and Many COWI employees are seconded to positions with leading developers of CUSTOMER offshore wind farms, such as Ørsted, Vattenfall, Copenhagen Instrastructure DONG Energy Wind Power A/S detailed design of scour protection for WTG foundations, offshore substations PERIOD 2016-ongoing and cable crossings. Establishing design basis and design methodologies for Partners who have developed and implemented a wide range of projects. prediction of scour depths around unprotected offshore foundations depending CUSTOMER Various on soil conditions.
ENERGINET, NEARSHORE WINDFARMS TECHNICAL DUE DILIGENCE OF OWF PROJECTS COUNTRY COUNTRY Denmark The Danish Ministry of Climate, Energy and Building has appointed Energinet. Due diligence performed for numerous banks, financial institutions, development U.S.A., Germany, Great Britain, dk (ENDK) to conduct pre-investigations at six nearshore wind farm sites in agencies, multilateral development banks and investors, among others Pension Denmark, Netherland PERIOD 2013-2015 Danish seas towards the process of tendering the operational licenses as well Danmark, BNP Paribas, Nordea, Arctas Capital Group, Danida, IFC, ADB and PERIOD as to conduct environmental impact assessments for each of the proposed EIB. COWI assists with transaction management to minimize the risks through Ongoing CUSTOMER Energinet.dk six sites: Vesterhav Nord, Vesterhav Syd, Bornholm, Sæby, Sejerø Bugt and identification and assessment of technical, environmental and financial issues. CUSTOMER Smålandsfarvandet. Energinet.dk contracted COWI A/S as metocean consultant Our vast pool of experts within every relevant discipline ensures that we have Various to carry out the meteorological and oceanographic studies for each location. the necessary experience and knowledge to assess and evaluate any kind of Additionally, Energinet wished COWI to study and emit a second opinion on the challenge. Specific references cannot be shared as most due diligence is carried wave conditions at a seventh location, Horns Rev 3, for a 400 MW farm 15 km out under strict non-disclosure agreements. of the west coast of Denmark. FOUNDATIONS FOR 11 OFFSHORE WIND FARMS
FOWPI - FIRST INDIAN OWF DEVELOPMENT SCREENING FOR GREEN FIELD POSSIBILITIES COUNTRY COUNTRY India Preliminary design and technical specifications for the first offshore wind farm Screening of the Danish North Sea for green-field project possibilities and Denmark off the coast of Gujarat with a capacity of up to 200 MW, including foundations, drafting of pre-investigation permit applications for the five most promising PERIOD PERIOD 2016-2019 electrical network (substation and grid connection), foundation design, wind projects with a capacity of minimum 1000 MW and up to 3000 MW. 2018-2018 turbines, specific technical studies for the selected site, metocean assessment, The services comprised constraint mapping of the whole Danish North Sea, CUSTOMER CUSTOMER European Union coastal surveys, EIA scoping, cost-benefit analysis, transmission layout, mesoscale modelling of wind resources and mapping of wind potential, pre- Confidential RECIPIENT geophysical survey, geotechnical desktop study, safety measures, wind resource feasibility assessment of grid connection, sea-bed conditions and energy yield Ministry of New and Renewable assessment, energy yield calculation and wind farm layout optimisation etc. All estimation. Energy of India (MNRE) and to be used as advisory material by a wind farm developer considering investing National Institute of Wind Energy India (NIWE) in the project. The services comprised building an Indian knowledge bank with data on Indian and European stakeholders and capturing European experience in offshore wind, and wind turbine technology guidance, coastal & onshore study, including guidance on construction and O&M harbour, development of NISSUM BREDNING WINDFARM - DESIGN BASIS a financial investment model, procedures for permit management, certification COUNTRY Design basis assistance for nearshore windfarm with four Siemens Wind Power and health and safety based on EU experience and best practice, enhance the Denmark 7 MW wind turbines. The windfarm is located offshore in Nissum Bredning capacity of National Institute of Wind Energy (NIWE) to act as the nodal agency PERIOD at Thyborøn. for the offshore wind sector in India. Also assist in capacity building of the MNRE 2016-2016 The services comprised metocean analysis of water levels, loads, wave, current for offshore wind. Secretariat services including support for stakeholders with CUSTOMER and ice conditions, estimation of design wind conditions for each wind turbine technical input and logistical support. Siemens Wind Power A/S position (wind shear, wind speed, extreme wind, turbulence, air density, etc), desktop study of marine cable route and seabed mobility, soil investigations including geophysical survey, geotechnical drillings and CPTs, laboratory tests. INCH CAPE OWF - CONCEPT AND REFINEMENT DESIGN FOR FID COUNTRY United Kingdom The Inch Cape Offshore Wind Farm is located approximately 15 km to the east of the Angus coastline in Scotland and covers an area of around 150 km². The PERIOD 2018-2020 water depths at the WTG locations range from 42-55 m below LAT, while the extreme water depths are 35.5 m to 63.3 m LAT. The foundations for the 72 CUSTOMER Boskalis Offshore Ltd. Vestas 9.5MW turbines are jacket structures. WIND AND SITE CONDITIONS FOR KRIEGERS FLAK OWF COWI’s services comprise: COUNTRY RECIPIENT Estimation of wind and site conditions for design basis input for the 605 MW Denmark Inch Cape Offshore Ltd. 1. Concept design for CFD (contract for difference) submission 26.11.2018 – Kriegers Flak offshore wind farm. A combination of mesoscale modelling and 28.03.2019 PERIOD analysis of data from a nearby offshore mast was used to estimate the design 2. Design refinement for FID (final investment decision) 20-05-2020 2017-2017 wind conditions for the site. The results were certified by DNV GL. CUSTOMER Vattenfall Vindkraft A/S
FINE SCREENING OF DESIGNATED AREAS FOR NEW COUNTRY Denmark OWF DEVELOPMENT Fine screening of four areas for potential development of new offshore wind PERIOD 2018-2018 farms with a capacity of 800 MW. An economic ranking of the four areas shall VESTERHAV NORD AND SYD - WIND AND SITE CONDITIONS COUNTRY be made by performing a fine screening with respect to several aspects such CUSTOMER The project consisted in an estimation of wind and site conditions for design Denmark Confidential as seabed conditions, environmental and spatial constraints, grid connection basis input for the Vesterhav Nord and Vesterhav Syd nearshore wind farms. The PERIOD and wind resource. The services comprised GIS modelling of environmental and nearshore wind farms will have capacities of 180 MW and 170 MW respectively. 2017-2017 spatial constraints, mesoscale modelling of wind resources, assessment of grid A combination of mesoscale modelling and analysis of data from offshore and CUSTOMER connection, including load flow analyses, preliminary inter-array cabling layout, onshore meteorological masts were used to estimate the design wind conditions Vattenfall Vindkraft A/S substation solutions, export cable, geotechnical assessment including screening for the site. The results were subject to a certification from DNV GL RECIPIENT of seabed conditions, determination of optimal placement of offshore wind farms Vattenfall Vindkraft A/S within each designated area, detailed layout optimisation, annual energy yield estimation, economic assessment and ranking.
SCREENING OF OFFSHORE WIND POTENTIAL IN BALTIC SEA REGION LILLEBÆLT SYD - OWF WIND AND SITE CONDITIONS COUNTRY COUNTRY Baltic Sea Region Identification and ranking of potential offshore wind farm areas in the Baltic Sea. The project involved assessment and or/estimation of design wind and site Denmark The capacity is in the range of 500 MW to 2000 MW. Furthermore, an assessment conditions, metocean, geotechnical conditions, design basis and concept PERIOD PERIOD 2018-2018 of the market situation and a gross value-added analysis were performed. design of gravity based foundations for the Lillebælt Syd Wind Farm. The 2017-2017 The services comprised localization of potential offshore wind farm areas in the offshore wind farms will have capacities of approximately 160 MW. CUSTOMER CUSTOMER EU Commission Baltic Sea based on environmental and spatial constraints, wind resource, seabed Sønderborg Forsyning A/S RECIPIENT conditions, analysis of potential grid connection points, annual energy yield RECIPIENT BASREC Countries estimates, ranking of identified sites and market and gross value added analyses. Sønderborg Forsyning A/S 021-1700-034e-19a solutions forour customers–andthereby sustainable andcoherent societiesintheworld. and environmental science,wetacklechallenges from manyvantagepointstocreate coherent our unique360° approach. Basedonourworld-class competencieswithinengineering, economics COWI isaleadingconsultinggroup thatcreates valueforcustomers,peopleandsocietythrough POWERING YOUR360°SOLUTIONS www.cowi.com/tags/wind-energy