Essential Energy says Wednesday's storms knocked out power for several hours to thousands of customers in parts of Tamworth and Inverell.
The biggest falls recorded included Tenterfield with 42mm, Glen Innes with 39mm and Tamworth with 35mm.
Narrabri recorded 21mm, with falls tapering off in the Gunnedah area, where only 11mm was recorded over the same period.
Regional General Manager with Essential Energy, Matt Patterson, says in Tamworth, just over 1,000 people were without power at the height of the storms.
"We had approximately 1,050 customers in Tamworth who lost power and had that power restored at 3:57pm," he said.
"They were generally around the Phillip Street area in South Tamworth and some on the fringes of Taminda as well."
Matt Patterson says lightning strikes also caused a headache for many customers in Inverell.
"Approximately 1,900 customers were impacted in Inverell initially and power went off at 3:43pm with storms in the area," he said.
"The majority of those customers came back on not that long afterwards, so there was a lot of lightning and we actually had some insulators that were damaged and we needed to repair them."
© ABC 2013
22:41 EDT Flash flooding has inundated homes in the Port Macquarie and Camden Haven area on the mid-north coast of New South Wales.