Talk:Offshore wind power

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Wind turbine inefficiency due to cloud-formation from upstream wind turbines[edit]

There is an intriguing photograph, and a discussion of some dynamic inefficiencies that may accrue to offshore wind farms, here: Wind Turbines Leave Clouds and Energy Inefficiency in Their Wake, 2010-01-22. I have not put any of this information into the WP article, but it may be appropriate to do so. Importantly, the linked magazine article provides a link to a more exhaustive reliable secondary source, a book, that might be good reading for any editor interested in the topic, and from which one could obtain verifiable citations for any new assertions added to the Offshore wind power article. Cheers. N2e (talk) 01:31, 25 January 2010 (UTC)

A report was made about that photo : http://www.mdpi.com/1996-1073/6/2/696/pdf
Related links : 1, 2, 3, 4 . TGCP (talk) 20:13, 4 September 2013 (UTC)

Section moved here for discussion[edit]

I'm moving the following section here because it is poorly sourced, poorly written, and adds little. Johnfos (talk) 00:32, 1 January 2011 (UTC)

Phases[edit]

Planning and permitting[edit]

Important elements:

  • Siting (finding a site with i.e. good wind, proximity to onshore transmission capacity, favorable regulatory regime and the right conditions in terms of water depth, soil conditions etc.)
  • Preliminary technical plan
  • Environmental impact assessment
  • Wind measurement
  • Applications for various permits required by local authorities
  • Communication with the public and stakeholders to ensure support for the plans
  • Predictions of the yield of the plant
  • Financial modelling
  • Financing

In Denmark, many of these phases were deliberately streamlined by authorities in order to minimize hurdles.[1]

In many cases, planning and permitting is done by specialized project development companies that do not intend to own and operate the plant, and that do not have the financial resources to do so. In other cases it is undertaken by utilities or independent power providers ("IPPs").

The planning and permitting phase can cost >$10 million, take 5–7 years and have an uncertain outcome. The industry puts pressure on the governments to improve the processes[2][3], and some governments are responding by streamlining them (e.g., UK, Ontario).

Procurement and construction[edit]

The owner of the wind farm typically procures:

All these items have special requirements for and special challenges in the offshore environment. For instance, turbines are much less accessible when offshore (requiring the use of a service vessel for routine access, and a jackup rig for heavy service such as gearbox replacement), and thus reliability is more important than for an onshore turbine.[4]

Foundations transfer the loads from the turbine into the seabed. Major issues for offshore foundations include the need for special installation vessels and the resultant risk and costs of waiting for weather windows. Technology exists to install without use of offshore crane.[citation needed]

Operations and maintenance[edit]

After commissioning of the offshore wind farm, the operations and maintenance phase commences.

A control center uses weather forecasts to predict electricity generation and interfaces with the Transmission system operator to integrate the electricity into the grid. The control center also monitors and controls the individual turbines and other components of the plant.

A maintenance organization performs maintenance and repairs of the components, spending almost all its resources on the turbines. Access to turbines is by helicopter or service access vessel. Some wind farms located far from possible onshore bases have service teams living on site in offshore accommodation units.[5]

-- Johnfos (talk) 00:32, 1 January 2011 (UTC)

Removing this unsourced material is prudent, but please make the effort of retaining the SOURCED material, either here or in Wind farm. I believe that the removed section contains notable information particular to offshore wind farms (as well as onshore), as permitting and construction is challenging and remains a hurdle for the power supply of the world. This description of the year-long effort is not described elsewhere on WP. Sources for this process may cumbersome to obtain. TGCP (talk) 12:12, 1 January 2011 (UTC)
Have added back some sourced material, in the Technology section. Johnfos (talk) 18:41, 1 January 2011 (UTC)

Missing any mention of the deep-water floating wind technology[edit]

The article is missing any mention of the deep-water floating wind turbine technology that has moved out of the labs, and small-scale tests, to large-scale (>2 MW) deep-water turbines now completing their second year of tests. This oversight should be, it seems to me, be remedied. I will try to get back here in the near future to fix this. N2e (talk) 18:43, 31 August 2011 (UTC)

Picture[edit]

Minor point, but as the UK has more offshore wind power than the rest of the world combined, shouldn't the page image be of a UK offshore wind farm, like the London Array?! — Preceding unsigned comment added by 80.6.102.83 (talk) 23:05, 26 August 2013 (UTC)

Pictures should be chosen for their informational quality, not volume, particularly for a subject in development and expansion such as this. But you do have a valid point, so please find or submit suitable pictures and we will take a look. The Lillgrund picture shows several desirable attributes such as scale, overview, background (landscape where the power is used) that other pictures lack. However, the Lillgrund photo lacks detail, but we can´t have it all (or can we?). Low altitude pictures lack the overview, and the other aerial photos lack landscape. This is a close second because it includes the transformer platform - if only it also had some land. TGCP (talk) 19:36, 27 August 2013 (UTC)