New Framework for Wind Energy Assessments

Press Release
Wednesday, February 06, 2013

The new framework document, developed over two years in collaboration with leading consultants and developers, will lead to more transparency and advancements in the quantification of project losses and uncertainties says DNV KEMA.


Various entities in the Renewable UK Wind Resource Working Group have come together to propose that the wind industry adopt a common framework for discussing both energy losses and uncertainties around energy assessments.


Ruben Menezes, project manager for the framework and consultant at DNV KEMA renewable energy services in London, says, “The document has been produced in collaboration with other consultants and developers in the U.K. The loss and uncertainty framework will aid the consultants when preforming due diligence on energy assessment completed by other leading consultants. All participants agree to report on their energy assessments in accordance to this framework. The goal for this framework is to lead to more transparency and ultimately advancements in the quantification of projects losses and uncertainties.”


Explaining the need for standard framework definitions, Menezes says a typical wind resource and energy yield assessment derives gross generation from a site’s wind speed frequency distribution and a turbine’s power curve. Technical loss factors are then applied to derive expected net energy generation. Example loss factors include equipment availability, wake losses, icing losses, and electrical line losses. An uncertainty analysis is then conducted to determine the probability distribution of net energy production. Example uncertainty categories include those associated with wind speed measurement, wind shear extrapolation, modelling, and loss assumptions. “However, without standard definitions for such loss factors and uncertainty categories, it is difficult to compare studies prepared by different consultants. Standardised definitions will not only facilitate direct comparison of energy estimates among different consulting studies, it will lead to more productive dialog and ultimately improved understanding of technical losses and uncertainties,” he says.


According to Menezes it is not uncommon for more than one energy assessment to be prepared for a proposed wind power facility. “Often the results of the assessments will have material differences, and these differences typically include different assumptions regarding technical losses used to derive net energy generation from gross energy generation. However, when both the definition of a loss and the value of the loss differ, direct comparisons are difficult to make. Compounding this challenge is the use of different uncertainty categories and their definitions, making it difficult to interpret and compare the results of different reports at the various probability levels. Developers, investors, and the consultants that support them will be able to focus on actual differences between assessments if assessments use a common set of loss and uncertainty definitions,” asserts Menezes.


The framework document has been developed in collaboration with the following participants: Arcus, Dulas, Natural Power, Oldbaum, Prevailing Wind Farm Analysis, Sgurr Energy, SKM, Wind Prospect and Vattenfall. DNV KEMA has managed the project.


"The definitions described in this document (see attached PDF) have been assembled based on consolidation of loss and uncertainty categories derived from input from the Renewable UK Wind Resource Working Group as well as industry input since circulating a final draft in October 2012,” says Menezes and adds, “Every project is unique and requires specific consideration, so not every item listed in this document will apply to every project being analysed or reviewed. The definitions are not an attempt to standardise the values of losses and uncertainties used in an assessment, but instead aim to provide a framework for the definitions."

Maritime Reporter June 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

Conference to Delve into Hybrid Power & Propulsion

The first international Hybrid Marine Power & Propulsion Conference will be held at the RNLI Lifeboat College, Poole UK from October 6-8, 2015.   Shock Mitigation

Otto Marine Secures $131 mln in New Contracts

Otto Marine Limited, an offshore marine company which specializes in building complex offshore support vessels, ship chartering and offers specialized offshore services,

Polarcus Divests from Select Projects in Europe, Africa

Polarcus Limited announced it has signed a Letter of Intent (LOI) with TGS-NOPEC Geophysical Company ASA (TGS) for the sale of its multi-client projects in Northwest

Contracts

Austal Starts Next US Littoral Combat Ship

Austal and the U.S. Navy held a keel-laying ceremony today for the future USS Manchester (LCS 14), marking the first significant milestone in its construction.

Port of LA to Start Yusen Terminal Improvements

Project will enhance wharf, rail and yard infrastructure to optimize terminal operations   The Port of Los Angeles will begin construction this summer on a two-year

HHI Delivers 14,000 TEU Box Ship to Seaspan

Seaspan Corporation accepted delivery of a 14,000 TEU containership, the YM Witness. The new containership, which was constructed at Hyundai Heavy Industries Co.

Offshore

FUGRO, Cross Group Awarded Multi Well GoM Contract

Fugro’s dynamically positioned multi-purpose drilling, well intervention and geotechnical vessel, Fugro Synergy, will showcase her capabilities on a multi well

Otto Marine Secures $131 mln in New Contracts

Otto Marine Limited, an offshore marine company which specializes in building complex offshore support vessels, ship chartering and offers specialized offshore services,

ICS: U.S. Approach to LNG 'Protectionist'

According to the Internatinal Chamber of Shipping, the United States Congress signaled last week its intention to approve major free trade deals with Asia and Europe.

Finance

Multimodal Freight Bill Introduced in US Senate

Cantwell, Booker, Murray, Markey introduce freight investment legislation aiming to eliminate chokepoints at critical highway, rail, port and intermodal facilities to support economic growth,

Crowley Acquires 4,300 Pieces of Liner Equipment

In response to continuing high customer demand, Crowley Maritime Corporation’s liner services group has placed orders for additional equipment, including hundreds

DPE is New Majority Shareholder in INTERSCHALT

Deutsche Private Equity GmbH (DPE) is set to become the new majority shareholder in INTERSCHALT maritime systems AG, the maritime software and services provider

Energy

Canada Slaps Sanctions on Russia Energy Firms

Canada slaps sanctions on Gazprom, other Russia energy firms   Canada is imposing economic sanctions against Russian energy firms such as natural gas producer

FUGRO, Cross Group Awarded Multi Well GoM Contract

Fugro’s dynamically positioned multi-purpose drilling, well intervention and geotechnical vessel, Fugro Synergy, will showcase her capabilities on a multi well

Baltic Exchange Eyes Move into Commodities

Baltex reaches breakeven level since start of 2015; Baltic previously faced broker opposition over platform. London's Baltic Exchange is studying a potential

Marine Science

Wave Power Unit for Victorian Waters

BioPower Systems Pty Ltd (BioPower) has finished constructing its prototype wave power unit to be installed off the coast of Port Fairy, Victoria, later this year.

Shell's Arctic Drilling a Threat for Pacific Walrus

A number of environmental groups are asking the Department of the Interior to rescind permission Shell has been granted to begin exploratory drilling in the

'Corporate Ocean Responsibility'

Recently in its New York City office Maritime Reporter sat with Paul Holthus, CEO of the World Ocean Council, for a discussion of the trend toward corporate ocean

 
 
Maritime Contracts Maritime Security Navigation Pipelines Pod Propulsion Port Authority Salvage Ship Electronics Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.2316 sec (4 req/sec)