Hydro Spill
Hydro spill tables [ Hydro spill terms ]
"Hydro spill" means the spillage of
water that could potentially have been used for the purposes of energy
production but was released for other reasons.
The categories that spill can fall into are listed in the following table:
Spill definitions
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Plant
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Hydro-spill was due to a plant malfunction including plant owned by a third party, or from plant testing, or from planned or unplanned outages.
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Obstructions
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Hydro-spill was due to physical obstructions preventing normal operation of generating plant. Such obstructions include weed, logs, silt, public, etc.
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High inflow
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Hydro-spill was due to high inflow events. This code applies when the flows exceed the ability of the generation scheme to generate at that level. This code only applies when the operator has no discretion over avoiding the release.
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Regulatory
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Hydro-spill was due to regulatory obligations. It includes statutes, resource consents, use permits, bylaws, etc. This code only applies when the operator has no discretion over avoiding the release.
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Contractural
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Hydro-spill was due to contractual obligations. This code only applies when the operator has no discretion over avoiding the release.
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Recreational
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Hydro-spill was for recreational use. That is where recreational, social or cultural interests have negotiated hydraulic profiles; and hydro-release has occurred as a result.
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Cost
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Hydro-spill was due to the cost of generation exceeding the spot price.
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Economic
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Hydro-spill was for other commercial reasons such as price support in the market.
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Transmission constraint
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Hydro spill was due to transmission or distribution constraints.
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Hydraulic constraint
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Hydro-spill was due to capacity differences within some hydraulically coupled schemes, requiring additional water bypass to maintain output.
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Other
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Hydro-spill was due to any other reason. When this code is used, an appropriate description and explanation must also be included.
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