There have been thunderstorms so it is presumably related to that and the impact on particular localities rather than a general problem.
The map of zones at http://www.Zenbu.net.nz is updated every half hour or so. Type Rarotonga in the search box to go straight to the satellite view.
Meanwhile, in Christchurch, about half the Zenbu sites are still down in the central, north of central and eastern areas. The map of zones shows the affected sites and areas.