Inspection & Consultancy Services Ltd have considerable experience and capabilities with hydro power generation stations, with significant experience and history with working with penstocks.

The experiences and capabilities include condition assessment inspections of penstocks and draught tubes, with the inspections being done from rope access methods.

Inspection & Consultancy Services have carried out condition assessment inspections on both steel and concrete penstocks, and have worked on refurbishment coating projects mainly in the Roxburgh Hydro Power Station, South Island, New Zealand.

Inspection & Consultancy Services Ltd also have experience with coating projects on the other facilities and assets of the Hydro Electricity Power Stations which includes buildings, sub-stations and electrical transmission structures, bus structures, transformers, storage tanks, bridges, etc.

We have also carried out Condition Assessment and furnished reports for other Hydro Power Station Penstocks at other power stations, including;-

  • Roxburgh – Clyde, Otago, New Zealand
  • Clyde – Clyde, Otago, New Zealand
  • Atiamuri – Bay of Plenty, New Zealand
  • Karapiro – Waikato, New Zealand
  • Aratiatia – Bay of Plenty, New Zealand

The scope of work that Inspection & Consultancy Services Ltd can offer with hydro stations includes;-

  • Condition Assessment Inspections and reports
  • Writing specifications and strategy documents for scope of work of refurbishment projects (including ITP documentation)
  • Appraisals of specifications, tenders, quotes and works methodology
  • Witness and inspect surface preparation (water blast, abrasive blast, surface cleanliness and profile)
  • Witness and monitor environmental and substrate conditions for painting
  • Rope access to inside or outside penstocks
  • Witness/monitor coating application of coatings
  • DFT measurements
  • Holiday testing of paint coatings
  • Project Management of coating projects



A sample of Hydro Power Stations that ICS has been involved with


Otago, New Zealand.
Clutha River
Commissioned 1956
8 penstocks each 5.5m in diameter, 50m long, and dropping nearly 46m in height

02 (4)
10 (2)
01 (10)

CLYDE – Otago, New Zealand
Contact Energy
432MW capacity with 4 operational penstocks
Dam 100m height
Penstocks ~6m diameter


Atiamuri, Bay of Plenty, New Zealand
Mighty River Power
84MW capacity

4 steel penstocks, each 47.8m long and 5.5m in diameter.

13 (1)
24 (1)

Karapiro, Waikato, New Zealand
Mighty River Power
90MW capacity

4 steel penstocks, each 47.8m long and 5.5m in diameter.

12 (1)

Aratiatia, Taupo, New Zealand
Mighty River Power
90 MW

01_1 (9)
03 (3)