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Retrieving Data
Reason for Spill Coleridge Matahina Waipori Total
Plant 0.14 1.56 1.7
Obstruction
High Flow 6.29 3.7 3.09 13.08
Regulation
Legal
Recreational
Support
Commercial
Transmission
Other
Total Energy (GWh) lost due to spill 6.29 3.84 4.65 14.78
Hydro Energy (GWh) Produced 66.77 135.08 113.4 315.2
% Energy lost due to Spill 8.61 2.76 3.94 4.48

Plant 

The hydro-release results from a malfunction in a plant owned by Trustpower or a third party. For example: a generator develops a serious fault and must be shut down, so water already released for generation must be spilled. 

Obstruction

The hydro-release results from a physical obstruction to a plant. For example: river debris clog the intake screens that protect generators; cleaning requires the generators to be turned off, so the water that can’t be stored must be spilled.

High flow

The hydro-release results from inflow water levels that exceed what the Scheme can handle and there’s no storage capacity. For example: during times of flooding or very high rainfall. 

Regulation

The hydro-release supports regulatory obligations, such as Resource Consents, use permits and bylaws. For example: Matahina’s Resource Consent requires a minimum river flow at all times.

Legal

The hydro-release results from legal or contractual obligations, where Trustpower has no other option. 

Recreational

The hydro-release supports recreational, social or cultural use. For example: a white water kayaking competition.

Support

The hydro-release is driven by economic reasons. For example: a weak energy demand makes the release the only economic option. 

Commercial

The hydro-release results from the electricity spot price not meeting the minimum threshold for operating economically.

Transmission

The hydro-release is due to transmission or distribution issues. 

Other

The hydro-release results from reasons other than those described above.