|Risk date||Publication date||Series||Value (GWh)|
|01/02/2010||01/02/2010||HRC revised||Revised by the Electricity Commission.|
This report publishes historical hydro risk curves against controlled storage over time. Hydro risk curves are published by the system operator and indicate the probability of energy shortage to the electricity system without using any contingent storage.
The system operator is responsible for publishing the hydro risk curves (HRCs) as part of its security of supply function. HRCs are produced for New Zealand and the South Island. Please see http://www.systemoperator.co.nz/security-supply/sos-weekly-reporting/hydro-risk-curves for current HRCs and further information.
The Authority undertakes industry and market monitoring, and shortage of hydro supply can impact things such as forward price expectations and market behaviours. This report tracks the history of the risk of shortage in the New Zealand electricity system, as reported by the system operator.
Hydro data (storage and/or inflows) is sourced from NZX hydro (data provided by NIWA) and is not available for download. Please see https://energy.nzx.com for more information.
In November 2010 responsibility for security of supply passed from the Electricity Commission to the system operator. The hydro risk curves are updated periodically including when there is a material change to the inputs. These updates are marked with a black triangle in the figure and have occurred for the following reasons:
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