A suspected lightning strike has cut power to parts of Rotorua.

Intially over a 1000 customers were affected however Unison spokesman Danny Gough said fault teams had narrowed down the outage area and only 400 customers were now affected.

Gough said the fault was most likely caused by a lightning impact on an overhead line somewhere around Kokiri St in Ngongotaha back towards Rainbow Springs.

According to the Unison website areas affected were Kawaha Point and Ngongotaha.

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Gough said teams were working hard to find the fault and it wouldn't be long until power was back on.