Offshore Windfarm Egmond aan Zee 4 years of Operation

Transcription

1 Offshore Windfarm Egmond aan Zee 4 years of Operation CUEN Offshore Wind Energy Conference 28 June 2011, Cambridge Elke Delnooz Operations Support Manager 1

2 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 2

3 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 3

4 Offshore windpark Egmond aan Zee 108 MW, 36 turbines V km offshore m water depth 4

5 Project main data Offshore demonstration project supported by Dutch government Selection of site Issue of building permits Investment subsidy Production subsidy Built and operated by NoordzeeWind 5 36 Vestas 3 MW V90 wind turbines 1 meteo mast, 116 m high Hub height 70 m, rotor diameter 90 m Hammered monopiles with internal grouted transistion piece Scour protection Water depth 20 m 3 x 34 kv cables to the shore 34/150 kv substation on shore Start operation 1/1/2007 Design life 20 years

6 Overview of Partnerships Shell NoordzeeWind BV Nuon Partners Tennet Imares ECN Grid Connection Monitoring Program NoordzeeWind CV Ballast Nedam Vestas Government Stakeholder Group (NGO s) Permits Legislation Financial Support Shell Project Management Nuon Power Purchase EPC Contract Operation Bouwcombinatie Egmond 6 6

7 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 7

8 Statistics Weather Downtime Exposure Hours NZW 8,736 7,669 6,373 7,871 Exposure Hours BCE 51,809 52,916 67,553 35,971 Total Exposure Hours 60,545 60,585 73,926 43,841 LTI TRC TRCF Total HSE Unsafe Acts / Near Misses # Days HSE Performance Hrs 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0 TRCF Exposure Hours NZW LTI Exposure Hours BCE TRC Unsafe acts / Near miss # Incidents Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Weather Downtime Days 2007 Total Weather Downtime Days 2008 Total Weather Downtime Days 2009 Total Weather Downtime Days

9 4 years of HSE experience Good safety performance so far but continue to focus on improvements Despite all the technical challenges, the project has always put safety on #1 Risk assessments based on ALARP (As Low As Reasonable Practicable) Cooperation and alignment between Owner and Contractor is key Offshore wind environment requires different approach to HSE than onshore wind (e.g. vessels approval, work vessel control etc.) 9

10 4 years of HSE experience Proactive involvement of Owner (e.g. vessel inspections) Awareness and commitment from all individuals is key and needs maintenance and investment (e.g. training, toolbox, workshops, recognition) Learning and improving from observations and incidents is key Invest in safety improvements, e.g. - Tool container in each nacelle - Improved handrail - New winches - Wave radar 10

11 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 11

12 Selected Historical Operating Information Output Offshore Availability (MWh) (%) 12

13 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled service Access Conclusion 13

14 Annual scope of services Extensive scope with annual inspections to build up experience and to prevent major unscheduled Planned in low wind season (Q2/Q3) Scheduled service Wind turbines Met mast Substation Inspection \ surveys of Transition piece (above and underwater); bolt tensioning, cleaning works, grating, coating etc. Cathodic inspection Mono pile Scour protection Sub sea cables; bathymetric side scan sonar survey; cable tracker survey 14

15 Scheduled service Windturbine Execution of scheduled services on time No major findings Metmast Complex scope with several parties involved Execution of scheduled services on time No major findings Substation Planning in low wind season (Q2) in close cooperation with Tennet Complex scope with several parties involved (but all activities done within 10 hrs) Execution of scheduled services on time No major findings 15

16 Scheduled service Coating\grating Needs annual inspection and maintenance High dependency on weather conditions (temperature, humidity etc.) No major findings Cathodic inspection Annual measurement on 33% of the installations No major findings Monopile Marine growth needs further investigation Grout issue was discovered during annual ROV survey 16

17 Scheduled service Scour protection Hardly any change in rock formation Cable exit (J-tube) well covered No cable exposure Subseacables Annual measurement Hardly any change in burial depth in deep water Some changes (due to moving dunes ) in shallow water 17

18 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 18

19 Unscheduled services Windturbine Major issues: Gearbox: partly reactive replacements; most pro-active replacement Generators: number of reactive replacements; most pro-active replacement Blade replacement after lightning 19

20 Unscheduled services Coating\grating Needs annual repainting (relatively small damages) Grating needed extra fixation Scour protection No additional rock dumping needed yet Subseacables No reburial needed yet 20

21 Unscheduled services Monopile During annual ROV survey, it has been discovered that, more settlement in the vertical direction is occurring between the foundation pile and the transition piece than had been expected. A repair method was engineered: filling the bottom half of the foundation piles with concrete, which forms a solid basement and prevents the transition piece from further settlement. A repair plan was made and 3 repairs were made in 2009 and the remaining 33 in

22 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 22

23 Access Daily transfers by crew vessel There s a need to increase the accessibility without jeopardizing the safety Ampelmann First trial in offshore windfarm in December 2007 Commercial operations during grout repairs

24 Access Safe step Planned trial in offshore wind farm in Q

25 Contents Project description Health Safety and Environment Power Production / Availability Scheduled services Unscheduled services Access Conclusion 25

26 4 years of operating experience Good safety performance so far but continue to focus on improvements Extensive scheduled scope which can be planned (in low wind season) to prevent unscheduled. The scope can be optimized based on the measured trend Bouw Combinatie Egmond (Vestas and Ballast Nedam) have acted professionally in the execution of the scope of work and have reacted professionally to the challenges faced Acceptable overall performance, despite technical challenges. Trend is going in the right direction Focus on reliability and improved access methods Big thanks to our careful and dedicated site team 26

27 27 Questions?