Power has been fully restored to about 20,000 homes and business after a 5.3 magnitude aftershock in Christchurch tonight.

National and Labour buried their differences and pledged to work together to rebuild Christchurch after Parliament passed legislation granting unprecedented powers to authorities responsible for getting the job done.

Another 123 buildings in Christchurch have been approved by Civil Defence for demolition or partial demolition - or are required to be made safe, bringing the total to 307.

Earthquake Recovery Minister Gerry Brownlee has brushed off claims that he will have war-time powers over Canterbury with tomorrow's passing of the Canterbury Earthquake Recovery Bill.

Job listings on internet auction site Trade Me are up 25 per cent on a year ago, with growth particularly strong in Southland and Gisborne.

Christchurch's people will be asked for their own ideas on what to add to the city's time capsules.