Power & Energy Solutions

The premier renewable energy publication

Constructing offshore wind farms can be a tricky business. In particular, the current generation of offshore wind projects because they are moving further from shore into deeper, less sheltered water. This makes absolute sense when you consider it from the perspective of the soon-to-be proud owners. After all, you want to put your wind farm where the wind blows strongest, on the most continuous basis, to generate the electricity and the revenue. However, from the perspective of the construction side of things, putting the turbines in the water and connecting them up is getting trickier and demands a new type of approach. Siem Offshore Contractors have revolutionised the installation of inter array cables for offshore wind farms, in bad weather and harsh conditions through their innovative, next generation, Siem Duo. This consists of the cable lay vessel Siem Aimery along with the installation support vessel Siem Moxie. However, to understand just how revolutionary this solution is, you need to understand a few things….

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What makes a good Crew Transfer Vessel (CTV)? SeaRenergy carried out an extensive study and shares the results with PES, highlighting ideas and suggestions based on design and offshore site challenges. With the first offshore wind projects evolving in the Baltic Sea, SeaRenergy was recently asked for advice on suitable crew transfer vessels for these waters. The underlying question was about how to achieve the highest possible utilisation in terms of workability and crew welfare. In order to properly evaluate all possible crew transfer vessel designs and sizes, weather data from two different locations were collected and analysed. Sufficient data through wave rider buoys and meteorological stations were gathered from two locations, situated in the German waters of the North Sea and Baltic Sea. Analysis in addition to the geographical circumstances led us to conclude that wave length is the most important factor when looking at CTV designs. The North Sea has deeper waters with an average depth of around 95 m, direct connection to the Atlantic Ocean and therefore strong currents due to water streams and tides. A combination of these aspects enables a development of long and high wind waves as well as long and high swells.

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By Lindsay Roberts, Senior Policy Manager, Scottish Renewables With two-thirds of the UK’s onshore capacity and an offshore sector now getting steel in the water, Scotland has long been a leading champion of the wind sector. The country is the birthplace of wind-powered electricity generation and the windiest place in Europe, with 25% of the continent’s offshore wind resource. Scotland has capitalised on that to deliver economic and environmental benefits across the country. The Conservative manifesto commitment to end new subsidy for onshore wind locked both it and large-scale solar – our two cheapest renewable energy technologies – out of the energy market. With costs continuing to fall, however, a report from Baringa Partners, commissioned by Scottish Renewables, found that the UK Government could deliver 1GW of new onshore wind capacity at no additional cost to consumers over and above the long-term wholesale price of power. The report’s conclusions are dependent on mature renewables being able to bid in future auctions for long-term contracts for clean electricity such as those offered to offshore wind and the new nuclear facility at Hinkley Point.

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PES brings you Offshore Project Support, your complete service provider in the offshore wind industry. Smarter, cost reducing and more efficient offshore wind industry. It’s possible. Offshore Project Support (OPS) from the Netherlands combines the knowledge, experience and equipment of four different offshore companies. Together, they are ‘the toolbox at sea’. A complete service for every stage in wind energy projects. Niels Noordeloos is OPS’s managing director. “Titles don’t really mean much to me. I’m a practical kind of guy who just happens to know exactly what’s going on in the offshore industry. I enjoy managing projects and like to come up with safe and well considered solutions. With OPS I can offer my clients the services they need.” Niels Noordeloos has worked in the offshore industry for 16 years and has been working as a freelance project manager over the last couple of years. “First in the gas and oil industry, later on in the offshore wind industry. At one point I was wondering if we could reduce costs by combining different projects. I envisioned a chain of wind parks from the southern part of the North Sea up to northern part of the North Sea. One vessel could sail

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This summer, the largest and most spectacular global gathering of the offshore wind industry takes place in London. PES brings you an appetiser and we hope to see you there. On June 6-8, WindEurope and RenewableUK are joining forces to host Offshore Wind Energy 2017, the world’s largest offshore wind conference and exhibition. Taking place in London’s magnificent ExCeL Exhibition Centre, this event will attract more than 10,000 visitors and play host to over 400 exhibitors, representing over 20 countries. As offshore wind begins to stake a claim to ever more of the globe’s energy mix, the decision to host this event in London was easy: the UK is the world’s leading offshore nation and is setting a national example that industry leaders will seek to emulate around the world in the busy years to come. Offshore Wind Energy 2017 will seek to build on the tremendous momentum achieved in recent years by offshore wind power: wind is now the fastest growing energy source in the world, and offshore wind has recently been a hotbed of innovation and ambition. Now is the time for industry insiders to solidify the goals and vision of this expanding sector. WindEurope CEO Giles Dickson says

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PES went to meet up with David Kristensson, Group CEO, Rasmus Johansson, CEO and Fredrik Hallqvist, Chief Commercial Officer at NOS, to hear about the way the Northern Group are establishing themselves as an all-round solution provider and problem solving company. PES: Can you explain the thinking and the background to the Northern Group?   David Kristensson: The idea we had, when we created the Northern Group, was that we wanted a group of companies, in the marine industry our customers and partners would see as an experienced and long term partner in areas such as, offshore wind, renewable energy, ship supply and lubricants. We wanted to be seen as a solution provider and problem solver and easy to do business with that our customers could turn to, with their assignments and tasks; with confidence their issues would be resolved.   We also wanted to be in the forefront when it comes to safety, innovation and flexibility and create a win-win feeling for our customers. We should add value to their processes and they should gain efficiency. A good example of this is the new build program, which we have been running for a number of years. We have used our own experience and

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Sofia Regell Hallström, Marketing Project Manager at MMT, came in to talk to PES about their latest all-inclusive surveys. Innovation and customer service are integral to the services provided. PES: Welcome to PES Wind magazine. Would you like to begin by explaining a little about the background of your organisation and how you currently serve the wind industry? Sofia Regell Hallström: MMT was founded in 1976 and has since then developed into a mid-size marine survey company with 250 staff. Today MMT is a key supplier to both the oil and gas sector as well as the renewable energy sector. From software developments to the latest remotely operated vehicle solutions, MMT has always had a strong focus on innovation in order to supply their clients with the best possible survey data on the market. Hydrographic, geophysical, geotechnical, environmental and UXO surveys are core business. Today, approximately 60 % of the turnover comes from the offshore wind and subsea cables where the UXO surveys, shallow geotechnical services as well as the environmental studies are also a key focus as well as the full scope of geophysical investigations. PES: We know you work in a variety of sectors so how important is the offshore

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Renewable energy, primarily wind and solar, will represent the largest source of electricity growth over the next five years, driven by falling costs and aggressive expansion in emerging economies. Globally, progress continues to be strong with increasing annual installed capacity and investments. As solar power becomes more economical, wind systems have to become competitive to continue to grow. Consequently, development of new technologies which reduce turbine maintenance and life cycle costs, improve reliability and lower levelised cost of energy (LCoE) will result in wider adoption of wind power generating systems. LCoE is one of the utility industry’s primary metrics for the cost of electricity produced by a generator. Key inputs to calculating LCoE include capital costs, fuel costs, fixed and variable operations and maintenance (O&M) costs, financing costs, and an assumed utilization rate for each generator. Wind asset operators understand that O&M costs must be minimized to maximize energy generation. Thus, turbine reliability and high energy throughput are a critical measure of wind generation. Although all components in a wind turbine must work reliably, a turbine’s wind pitch system, whether electric or hydraulic, is a key component required for optimum blade pitch control under adverse wind conditions; to maintain turbine

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Later this year, the blades on the world’s first full-scale floating wind farm will start to turn, harnessing the winds that hurtle from the continental shelf. Hywind Scotland will literally sit on the North Sea, 26 kilometres to the East of Aberdeen. But while big winds make it a perfect site for energy generation, they will often be accompanied by big seas. In the Buchan-Deep, waves of over 1.5m Significant Height will prevail for up to half of the year and ensuring that turbines are productive in these environments will require new solutions to getting maintenance technicians safely and cost-effectively onto and off turbines in high seas. With this access challenge in mind, Edinburgh based Limpet Technology is embarking on the development of a new access system that aims to allow technicians and loads to transfer between vessels and offshore wind turbines more safely and in higher sea states.  Supported by an innovation grant from Scottish Enterprise, the overarching technical objective of the project is to deliver a solution that will allow safe and reliable access to offshore turbines in waves of up to and beyond 2.5 metres Significant Height (Hs). Limpet Technology’s CEO, Stephen Cornwallis commented. “To make operations and maintenance

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PES caught up with Andreas Jagtøyen, Senior Vice President, Energy Division, Kongsberg Digital AS, who gave us a full account of their EmPower software suite. A way for wind farm asset managers to make informed choices to maximise production and reduce costs. PES: Welcome to PES Wind magazine. Thanks for talking with us. Would you like to begin by explaining a little about the background of Kongsberg and the importance of the offshore wind industry to you? Andreas Jagtøyen: KONGSBERG finds the offshore wind industry highly interesting, especially seen in the light of increased need for renewable energy. One of the main reasons for our interest is that the offshore wind market shares many interesting commonalities with what we're doing in both the maritime area and in the oil and gas area. In addition, the offshore wind market is experiencing exceptional growth, and, although it is little known, KONGSBERG has long experience with the offshore wind industry, having supplied sensor systems and services to the wind sector for more than 20 years.

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