WTG-04

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WTG-04 is a turbine at Quellmoor Ridge Wind Farm.^{123456789101112} It is subject to bat-protection curtailment and monitoring requirements under the current environmental permit.¹³¹⁴ In 2026, WTG-04 had a category 4 trailing-edge crack on blade B and was scheduled for replacement.¹⁵¹⁶¹⁷

Facts

• Bat activity must be monitored at the nacelle of WTG-04 with an acoustic detector from April to October each year.¹³
• From 1 June to 31 August each year, WTG-03, WTG-04 and WTG-05 must be stopped between 22:00 and 05:00 local time whenever hub-height wind speed is below 6.0 m/s and air temperature is 10 °C or higher.¹³
• Variation 2 was justified by the presence of a protected bat species maternity roost in Skelvane Wood, east of WTG-03, WTG-04 and WTG-05, with foraging near the turbines on warm, calm summer nights.¹³
• WTG-04 had the highest overall blade category in the turbine summary: blade A category 2, blade B category 4, blade C category 2, and highest category 4.¹⁸
• Finding F-01 is a category 4 trailing-edge crack on WTG-04 blade B.¹⁵
• For F-01, repair is not recommended at that location and WTG-04 blade B is to be replaced before 2026-09-30.¹⁵
• Until WTG-04 blade B is replaced, the crack is to be checked by drone every month and the turbine is to be stopped immediately if the crack exceeds 1.2 m.¹⁵
• Finding F-02 is category 3 leading-edge erosion on WTG-04 blade B, with coating loss between radius 52 m and 57 m and no exposed laminate.¹⁵
• The recommendations are to replace WTG-04 blade B before 2026-09-30 using a crane lift, repair category 3 findings within 6 months using rope access, and perform the next full inspection in May 2027.¹⁵
• The job is the WTG-04 rotor blade B replacement, described as a single blade lift.¹⁹
• The maximum gust is 11 m/s; no lift is allowed in fog with visibility below 300 m, lightning within 15 km, or icing, and wind is read at the WTG-04 nacelle anemometer and boom tip anemometer.¹⁹
• The exclusion zone radius is 150 m around WTG-04 during the lift.¹⁹
• WTG-03, WTG-04, and WTG-05 started S420 Curtailed - environmental condition around 22:00 on 2026-06-01 and ended the curtailment around 05:00 on 2026-06-02.^202122232425
• WTG-04 entered S310 Maintenance mode on 2026-08-07, raised and cleared A1001 Emergency stop activated during that maintenance period, and then ended S310.^26272829
• WTG-04 raised A2140 Gearbox oil filter differential pressure high at 2.89 bar on 2026-08-11 17:18:08 and cleared it at 1.90 bar on 2026-08-11 18:22:08.³⁰³¹
• WTG-03, WTG-04 and WTG-05 entered S420 Curtailed - environmental condition at 22:00 on 2026-08-25, and the curtailment ended at 05:00 on 2026-08-26.^323334353637
• WO-26-0355 for WTG-04 is a planned high-priority corrective-maintenance work order to replace rotor blade B for a trailing-edge crack, with planned date 2026-09-08 and references WBS-2026-031 and LP-2026-009.¹⁶
• WTG-04 blade B had a category 4 trailing-edge crack and had to be replaced before 2026-09-30 under WO-26-0355.¹⁷
• The crane lift for the WTG-04 blade replacement was to be planned with Tailspin Heavy Lift for early September.¹⁷
• The bat protection curtailment season started on 1 June for WTG-03, WTG-04, and WTG-05 under permit condition 7.3.¹⁴
• The turbine labels shown on the plan are WTG-01, WTG-02, WTG-03, WTG-04, WTG-05, WTG-06, WTG-07, WTG-08, WTG-09, WTG-10, WTG-11, and WTG-12.^{123456789101112}
• WTG-04 received a ground-based visual inspection of blade B, with nothing new noted.³⁸
• WTG-03, WTG-04, and WTG-05 are expected to have bat curtailment again at night due to low wind.³⁹
• WTG-03, WTG-04 and WTG-05 are expected to stop from 22:00 if wind remains low due to bat curtailment, and this should not be reset.⁴⁰
• On WTG-04, the 2026-07-02 drone check of blade B found the crack unchanged at 0.9 m.⁴⁰
• Rescue kit inspections were performed on WTG-01 to WTG-04 under MP-HSE-01.⁴¹

Timeline

• 2026-06-01: WTG-03, WTG-04, and WTG-05 started S420 Curtailed - environmental condition around 22:00 on 2026-06-01 and ended the curtailment around 05:00 on 2026-06-02.^202122232425
• 2026-07-02: On WTG-04, the 2026-07-02 drone check of blade B found the crack unchanged at 0.9 m.⁴⁰
• 2026-08-07: WTG-04 entered S310 Maintenance mode on 2026-08-07, raised and cleared A1001 Emergency stop activated during that maintenance period, and then ended S310.^26272829
• 2026-08-11: WTG-04 raised A2140 Gearbox oil filter differential pressure high at 2.89 bar on 2026-08-11 17:18:08 and cleared it at 1.90 bar on 2026-08-11 18:22:08.³⁰³¹
• 2026-08-25: WTG-03, WTG-04 and WTG-05 entered S420 Curtailed - environmental condition at 22:00 on 2026-08-25, and the curtailment ended at 05:00 on 2026-08-26.^323334353637
• 2026-09-08: WO-26-0355 for WTG-04 is a planned high-priority corrective-maintenance work order to replace rotor blade B for a trailing-edge crack, with planned date 2026-09-08 and references WBS-2026-031 and LP-2026-009.¹⁶
• 2026-09-30: For F-01, repair is not recommended at that location and WTG-04 blade B is to be replaced before 2026-09-30.¹⁵
• 2026-09-30: The recommendations are to replace WTG-04 blade B before 2026-09-30 using a crane lift, repair category 3 findings within 6 months using rope access, and perform the next full inspection in May 2027.¹⁵
• 2026-09-30: WTG-04 blade B had a category 4 trailing-edge crack and had to be replaced before 2026-09-30 under WO-26-0355.¹⁷

Documents

• Environmental Permit EP-2018-0417 - Quellmoor Ridge Wind Farm (consolidated with variation 2)
• MOC-2025-012 - Gearbox Oil Grade Change to PWG 220
• Blade inspection report WBS-2026-031 - Quellmoor Ridge Wind Farm (May 2026)
• Lift Plan LP-2026-009 - WTG-04 Blade B Replacement
• SOP-GBX-010 Rev. B - Gearbox oil change
• SOP-WAH-003 Revision B - Working at height and rescue
• WI-GEN-014 Rev. A - Generator Brush Replacement
• Asset Register 2026 of Quellmoor Ridge Wind Farm, revision 2026-01-12
• Maintenance Plan 2026, Issue 2 — Quellmoor Ridge Wind Farm
• SCADA alarm and status log, 2026-04-01 to 2026-08-31
• Work Orders Export through 2026-08-31
• KPI Export 2026-H1
• Monthly O&M Review Minutes – 2026-06-18
• Quellmoor Ridge Wind Farm Onboarding and Site Rules (February 2025)
• Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C
• Email RE: LWS-TS-48213 Applicability of SB-LWS-2025-07 Rev. A to Quellmoor Ridge
• Shift Handover Note - Day Shift - 18/07/2026
• Shift Handover for 2026-07-29 Day Shift
• Shift handover - 2026-07-15 (day shift to night shift)
• SOP-GBX-010 - Gearbox oil change, Revision A (superseded)

Related

• Topics: Blades, pitch bearings and main-component lifts, Cold-climate operation and icing, Environmental permit and night curtailment, Gearbox lubrication and oil changes, Gearbox temperature, vibration and oil analysis, Generator brushes and electrical systems, Grid connection and grid operator instructions, Safety, isolation and work at height, Spare parts, stock levels and supply, Training, site rules and acronyms

Sources

Footnotes

1. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 5 · OCR ↩ ↩²

2. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 6 · OCR ↩ ↩²

3. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 9 · OCR ↩ ↩²

4. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 10 · OCR ↩ ↩²

5. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 11 · OCR ↩ ↩²

6. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 13 · OCR ↩ ↩²

7. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 12 · OCR ↩ ↩²

8. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 14 · OCR ↩ ↩²

9. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 16 · OCR ↩ ↩²

10. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 18 · OCR ↩ ↩²

11. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 20 · OCR ↩ ↩²

12. Quellmoor Ridge Wind Farm Site Layout Plan - Rev. C — region 21 · OCR ↩ ↩²

13. Environmental Permit EP-2018-0417 - Quellmoor Ridge Wind Farm (consolidated with variation 2) — p. 2 · ✓ quote verified ↩ ↩² ↩³ ↩⁴

14. Monthly O&M Review Minutes – 2026-06-18 — ¶ 14 · ✓ quote verified ↩ ↩²

15. Blade inspection report WBS-2026-031 - Quellmoor Ridge Wind Farm (May 2026) — p. 2 · ✓ quote verified ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

16. Work Orders Export through 2026-08-31 — row 68 · table ↩ ↩² ↩³

17. Monthly O&M Review Minutes – 2026-06-18 — ¶ 12 · ✓ quote verified ↩ ↩² ↩³ ↩⁴

18. Blade inspection report WBS-2026-031 - Quellmoor Ridge Wind Farm (May 2026) — p. 1 · ✓ quote verified ↩

19. Lift Plan LP-2026-009 - WTG-04 Blade B Replacement — p. 1 · OCR ↩ ↩² ↩³

20. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 622 · table ↩ ↩²

21. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 623 · table ↩ ↩²

22. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 624 · table ↩ ↩²

23. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 625 · table ↩ ↩²

24. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 626 · table ↩ ↩²

25. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 627 · table ↩ ↩²

26. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1548 · table ↩ ↩²

27. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1549 · table ↩ ↩²

28. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1550 · table ↩ ↩²

29. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1551 · table ↩ ↩²

30. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1654 · table ↩ ↩²

31. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1655 · table ↩ ↩²

32. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1870 · table ↩ ↩²

33. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1871 · table ↩ ↩²

34. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1872 · table ↩ ↩²

35. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1873 · table ↩ ↩²

36. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1874 · table ↩ ↩²

37. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1875 · table ↩ ↩²

38. Shift Handover Note - Day Shift - 18/07/2026 — lines 6–12 · ✓ quote verified ↩

39. Shift Handover for 2026-07-29 Day Shift — lines 5–14 · ✓ quote verified ↩

40. Shift handover - 2026-07-15 (day shift to night shift) — lines 11–14 · ✓ quote verified ↩ ↩² ↩³

41. Shift handover - 2026-07-15 (day shift to night shift) — lines 18–20 · ✓ quote verified ↩

Provenance badges✓ quote verified the quoted words were found verbatim in the source texttable values parsed deterministically from the cited table rowsOCR text recognised from an image; compare it with the image