A Fire and Emergency spokesman said they had been called to 11 weather-related call outs in Auckland between 11am and 6.30pm.

At 2.30pm fire crews responded to the intersection of Main Highway and Findlay St in Ellerslie after a retaining wall had fallen down onto a person.

Fenz assisted ambulance at the scene and rescued the person stuck under the retaining wall.

Most weather-related jobs had been associated with wind, causing trees to fall down and powerlines to arc.

The latest call-out was in Beach Haven at 6.11pm, where a tree had fallen on a house.

"As forecast, the wild weather has now set in across Auckland with windy conditions expected to last until later this evening.

"Vector crews have been responding to outages in the north and western parts of the region, including Wellsford, Dairy Flat and Waitakere – both Dairy Flat and Waitakere have now been restored. 

"Our crews will be stood down, if it becomes unsafe for them to work in the weather conditions, and will continue as soon as it is safe to do so.

"We’re recommending people charge their devices and keep up-to-date with local weather warnings. It’s also a good idea to tie down any loose items outside and bring what you can inside.

"Please remember to stay well clear of any downed lines, treat them as live at all times, and call 111 if you see any.

"Visit vector.co.nz/outages for the most up-to-date information on power outages in your area.We will provide a further update in the morning."

"The Customer Advice Notices we put out this afternoon are part of our processes for working with industry when electricity supply is tight, as it is this evening and tomorrow morning due to the ongoing cold snap. 

"It refers to Transpower’s customers, being electricity generators, local lines companies and major industrial customers connected directly to the grid, not electricity consumers.

"The notices call for more electricity generation to be made available and prepare the industry to respond if the situation deteriorates, for instance if it is colder than forecast or wind generation drops below forecast during the peaks.

"Industry has responded to the notice, and we do not expect any impact on consumers’ electricity supply. We would communicate publicly if we anticipated impact on consumers."

Two people needing to be rescued from Aoraki Mount Cook National Park are stranded in a hut tonight.

Police received a report of two people needing assistance at a the hut about 2.45pm.

"Due to weather conditions, rescuers are unable to reach the pair at this time. Police are in contact with the pair and continue to monitor the weather conditions."

Transpower has issued a "customer advice notice" warning of potential electricity generation shortages tonight. 

The notice says national residual generation may fall below 200 MW between 5.30pm and 8pm.

Generation companies are asked to increase energy and reserve offerings, and increase transmission offerings "where generation may be constrained". 

"Process and further requests, if situation worsens: 

This CAN gives you early notice that if the situation worsens we may have insufficient generation to meet demand and cover reserves for a contingent event. If insufficient generation and reserve offers appear in the schedules, we will send: 

• A Warning notice (WRN) which will make further requests to participants to help resolve the situation. This could happen up to gate closure (1 hour ahead of real-time). 

• A Grid Emergency Notice (GEN) within one hour of real-time which will make further requests to gridconnected consumers and distributors to take action to alleviate the situation."

Electric Kiwi is calling for its customers to reduce power usage this evening between 5.30pm and 8pm.