Wellington Electricity has told the Commerce Commission it needs $31.2 million to make the network in the region more resilient to earthquakes.
The commission will consider the proposal from the company that owns the electricity lines that supply more than 160,000 homes, and feedback is invited from the public.
Seismic reinforcement, new mobile switchboards and new hardware are needed, WE says.
"The Kaikoura earthquakes highlighted Wellington's vulnerability and the need for lifeline utilities like Wellington Electricity to be able to function to the fullest extent possible during and after a disaster," Commerce Commission chairman Dr Mark Berry says.
"It is important that Wellington, as New Zealand's second largest metropolitan area and the home of central Government, is adequately prepared for a significant earthquake. Our proposed approach would enable this."
If approved by the commission, the investment could be paid for by higher electricity bills, it has been reported.
A high-level business case will be presented by WE next week.