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While at Alert Level 4, as an essential service provider, MainPower will continue to supply electricity to North Canterbury throughout this time. All scheduled maintenance and customer works will be postponed. All planned outages have been cancelled. Our 24-hour fault response services will continue to operate.
Please call 0800 30 90 80 to report a power outage.
For non-urgent matters, please use the contact us form.
Danger: Felling trees near power lines
MainPower has experienced a number of recent outages due to members of the public felling trees near power lines without following the correct process. This is incredibly dangerous and needs to be completed by a suitably qualified arborist. Please contact MainPower or visit the Trees and power lines page on our website for more information on how to fell trees and maintain vegetation safely when near power lines.
Treat all lines as live during the outage period; power may be restored at any time. If you require further information, please call MainPower’s 24-hour fault line – 0800 30 90 80; to report an emergency call 111.
Network Harmonics are created by devices connected by the customer to the electricity network. These harmonics are typically referred to as grid pollution due to the effect they have on the power quality within the network.
This change in power quality can impact on the performance of sensitive devices such as computers, transformers and motors causing them to malfunction or fail.
The harmonics are created by non-linear loads. The most common piece of equipment responsible for the creation of harmonics is Variable Speed Drives (VSD’s). The harmonic currents created by these devices cause voltage distortion at various points in the network dependant on the system impedance.
These harmonics are produced by customer devices and therefore must be controlled at the site where they are produced. This is essential because controlling the individual sources will mitigate the flow of harmonics into the network. This will also mitigate the effects of the harmonics on the wider network.
Any customer with a cumulative VSD load exceeding 20kW must adhere to this standard.