Bad weather is good news for New Zealand's energy prices - with the southern hydro lakes receiving a top up

Energy supply issues have been leading to high prices and a potential crisis.

Meridian says persistent rain and snow over the fortnight has increased the levels of lakes Pukaki, Manapouri and Te Anau.

Seasonal snow storage in the Waitaki catchment is also on the up, now at 83 percent of average compared to 50 percent.