A power cut could be due to a widespread outage, or a localised fault at your place.
The first thing to do is to contact either your network company below or ring us on 0800 496 496, 24 hours a day to report your power outage.
Nelson
Nelson Electricity (external link) - outages page (external link) - 03 5469 256
Other?
Is your region not shown? check our outages page.