There will be a slight interruption in the power supply in Wairoa area, the power supply in Tairāwhiti will be reduced to one loop, and Transpower NZ will perform the necessary maintenance work at its Tuai substation.
Transpower is in the process of replacing the circuit breaker rod structure that supplies power to Tairāwhiti and Wairoa.
The work plan is carried out from today to Monday to take advantage of the lower power demand on weekends.
The connection configuration type of the Tuai substation usually requires a complete blackout.
However, Transpower worked with Eastland Network to design a solution that would allow them to take on work while supplying power to Eastland Network through a temporary bypass.
To activate this bypass, there will be two brief power outages in all areas of the Wairoa area, including Wairoa, Tuai, Ruakituri, Morere, Mahia and Nuhaka.
There will be a small 10-minute power outage at around 6 o'clock this afternoon to activate the temporary bypass.
A similar interruption will be required from 6 am to 6:30 am on Monday to restore normal connections in the area.
Electricity for Tairāwhiti is usually provided by a double-circuit 110kV line from Tuai.
During work, Tairāwhiti's power will be supplied through one circuit, while the other circuit will be closed in order to complete the work safely.
"This is enough to meet the energy needs of the region," said Jarred Moroney, general manager of Eastland Network. "For these four days, Eastland Network-including Gisborne and Wairoa-will not have our usual backup power supply,"
"This means that if one of the remaining lines loses power, the area may lose power. However, we have worked with Transpower to minimize the possibility of any power outages during this period and reduce the duration of the outage The consequences.
"This includes preliminary inspections of substation lines and thermal visual inspections of equipment.
"We thank the residents of Wairoa in advance for their understanding during the two short power outages.
"Please check the Eastland Network and Transpower Facebook pages for updates."