Penstock Inspection

Hydroelectric power or hydroelectric energy has been a part of New Zealand’s energy system for over 100 years, providing more than half of the country’s electricity needs. Hydroelectric energy and our hydro stations are currently the primary source of renewable energy in New Zealand, and frequent inspection, repair, and ongoing maintenance is key to protecting our energy sources.

Penstocks are pipes or long channels that carry water down from the hydroelectric reservoir to the turbines, making them critical pieces of infrastructure. Abseil Access has provided specialist services to maintain penstocks for major hydro facilities and clients across NZ including Meridian Energy & Trust Power NZ since 1996.

Penstock inspection up close.
Our penstock integrity inspection services include:
  • Confined Space Entry (CSE)
  • Industrial Rope Access
  • Concrete Condition Inspection
  • Coating & Corrosion Surveys
  • Cathodic Protection Surveys
  • Non-Destructive Testing (NDT)
  • Concrete & Coating Remediation
  • Anode Replacement
  • Spillway Inspection & Maintenance
  • Shutdown Service & Support

Penstock Specialist Access Services

Penstock access services.

Abseil Access offer comprehensive specialist access services to penstocks and hydro facilities including industrial rope access and confined space entry (CSE). Since 1992, the Abseil Access team have provided specialist access solutions to the hydroelectric market such as surveying, NDT and inspection, industrial maintenance, impressed current cathodic protection, and coating repairs.

Penstock Integrity Inspection

Penstock inspection.

Deterioration of concrete or coating protection systems in penstocks can quickly become a real challenge for hydroelectric plant operators, costing significant amounts in remediation and repair if not identified and dealt with early. Abseil Access provides comprehensive inspection of concrete and steel penstocks providing detailed reports and recommendations to enable our clients to proactively manage the integrity of their asset or structure.

Our Group’s inspection pedigree,access services, and concrete or coating protection maintenance capabilities, ensure the Abseil Access team can provide safe, high quality, and cost-effective solutions for penstocks.

Penstock Remediation & Repair

Corrosion, erosion, and degradation of both steel and concrete penstocks can occur for a host of reasons be it incorrect application, wear, surface damage from scouring or lack of cathodic protection.

The Abseil Access team has provided a range of magnesium sacrificial anode installations, coating surveying and remediation as well as concrete inspection, maintenance, and repair services to penstocks across New Zealand to ensure the continued protection and operations of our client’s assets.

Case Studies

Impressed Current Cathodic Protection.
Impressed Current Cathodic Protection
Manapouri Hydroelectric Powerstation.
Manapouri Hydroelectric Powerstation
Kaimai Hydroelectric Powerstation.
Kaimai Hydroelectric Powerstation
Wheao Hydroelectric Powerstation.
Wheao Hydroelectric Powerstation

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Capability Statement

Reference Project
PDF 4.2 MB