A new substation designed to help complete a transmission ring around Auckland and reduce the city's vulnerability to power shortages has formally opened.
The site on Hobson Street in the central city houses infrastructure belonging to both lines company Vector and grid operator Transpower.
In addition to securing Auckland's power supply, it also gives another corridor to supply electricity to Northland.
The $80 million substation will link into Transpower's Northland and Northern Auckland project, which is due for completion early next year.
Transpower chief executive Patrick Strange says the opening is a milestone.
He says planning for the project started after the 1998 power crisis, in an attempt to bring Auckland in line with equivalent cities such as Sydney and Melbourne.
Dr Strange says the city is now close to achieving that standard.