
Poor risk management and inadequate contingency planning were major contributing factors to the power supply failure.
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After a series of four power cable failures, on 20th February 1998, Mercury Energy Limited (“Mercury”) the major distributor and retailer of electrical power to the city of Auckland, announced that it could no longer supply power to the central business district.
At the beginning of 1998, almost all of downtown Auckland received electricity from the supplier Mercury via only four power cables, two of them 40-year old gas-filled cables past their replacement date.
One of the cables failed on 20 January, possibly due to the unusually hot and dry conditions, another on 9 February, and due to the increased load from the failure of the first cables, the remaining two failed on 19 and 20 February, leaving the central business district (except parts of a few streets) without power.
It took five weeks before an emergency overhead cable was completed to restore the power supply.
For much of that time, about 60,000 of the 74,000 people who worked in the area in 1998 worked from home, or from relocated offices in the suburbs. Some businesses relocated staff to other New Zealand cities, or even to Australia.
Most of the 6,000 apartment dwellers in the area had to find alternative accommodation.
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The New Zealand Government commissioned a Ministerial Inquiry to examine the failure of the cables and Mercy’s management and technical expertise.
The 193 page report covers the history of the supply to the CBD, the cable failures, why the power supply failed, governance, conclusions and recommendations.
http://www.med.govt.nz/templates/Page____12136.aspx
Corporate Governance Issues
The findings on corporate governance as it relates to the failure of power supply were:
- The corporate governance structure of Mercury did not cause the power supply to fail, but through its effects on governance an opportunity to prevent it was lost.
- The corporate governance structure of Mercury did not provide clear lines of accountability or strong shareholder instigated disciplines. These clear lines of objectives, accountability, reporting and discipline were considered important if not vital to create an environment conducive to strong company performance.
- Network risks and other risk management procedures differed and accountability and the performance and implementation of both was not clear.
Operational Issues
The findings relating to operational matters were:
- Maintenance policy – Mercury relied on the manufacturer’s maintenance procedures. Whilst it was considered reasonable practice to rely on manufacturer’s manuals initially, over time the company should have developed company specific manuals that took into account the ageing condition of its assets, as well as new developments in knowledge pertaining to those assets that have developed since the date of manufacture and installation.
- Contractual arrangements – the agreement that Mercury had with Energy Australia did not bind Energy Australia to undertake any work for Mercury at any time, but stated the terms upon which work would be done if Mercury requested work and Energy Australia agreed to provide it. If Energy Australia had need of their own staff, Mercury would be without the necessary skills. The Inquiry found that Mercury’s contractual arrangements were insufficiently specified given the company’s reliance upon them.
- Maintenance contracts – the relevant contract did not provide adequate definition of the role between the contractor and the company. The contract did not identify any link the manufacturer’s maintenance specifications, job requirements, quality standards or personnel expertise. The contract provided no link to a maintenance policy. The contract did not clearly define accountabilities and decision-making roles. The contract assumed the contractor had knowledge of all the maintenance requirements on the cables although Mercury argued they maintained the in-house expertise for this role. The Inquiry concluded that Mercury’s maintenance contract was ineffective.
- Spare parts policy – Mercury relied on the availability of spares from Energy Australia. However, when spares were required from Energy Australia in 1995/96 and again in 1998 they were not available from that source. Mercury provided no evidence that an adequate contact structure for spares pooling was in place with Energy Australia.
- Asset audits – Mercury did not undertake comprehensive asset audits on a periodical basis to confirm capability and ongoing reliability.
- Asset integrity – Mercury did not take adequate measures to protect the integrity of its assets. It had allowed routes to be compromised by buildings, traffic, trees, other cables and other threats to supply security.
Risk Management and Contingency Planning
The findings relating to risk management and contingency planning were:
- There was unclear accountability for risk management practice and monitoring at both the senior management and Board level.
- When the first electrical failures on the gas cables occurred, Mercury failed to recognize that network risk had increased and treated the failures as it had previous gas leaks; no systematic investigation and resolution of the failure mechanism occurred.
- A pre – event risk assessment report in 1997 critically underestimated the failure risk of the gas cables and, as a consequence, Mercury under-planned for this risk.
- Mercury failed to assess the increased incidence and risk of outages due to contractor caused damages and failed to take action to address the risk.
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The report was to have been released on 14th July 1998.
It was, however, delayed out of consideration for the sudden death of Mercury CEO Wayne Gilbert from a heart attack on the day of the report’s intended release.
