Adams was nearing the end of his show when he told the crowd that a storm was approaching and he had to get off the stage.

The 59-year-old, who has sold an estimated 100 million records, had hoped to return but the heavy rain forced the show to be called off, soaking punters as they made their way to the carpark.

"Great night in Hunter Valley, Bimbadgen, Australia, cut slightly short by a massive electrical storm," a statement on Adams' Instagram page read.

"Hope everyone was safe and managed to get some shelter."

The storm produced a spectacular lightning show over the Hunter as it rolled across the region. It also caused a trail of destruction, with the SES responding to 20 calls for assistance and more jobs piling up on Sunday morning.

The first call came in at 10.02pm and as the storm converged on he Hunter Valley several large jobs were reported.

Cessnock was one of the worst hit areas, with crews from Newcastle, Lake Macquarie, Maitland and Singleton heading to the township to help out on Sunday.  

"We are working through to clean-up, with teams out in the field," a NSW SES spokesman said.

"The majority of jobs are trees down, trees over roads, power lines, trees across cars and carports."

The storm brought down a large tree in Cessnock overnight which landed on a nearby home, crashing through the roof. No one was injured during the incident, but it took SES crews and the Cessnock Volunteer Rescue Association all night to remove part of the tree in preparation for further work on Sunday. 

Storm damage also caused power outages to about 7500 homes and businesses in parts of Cameron Park, Edgeworth, West Wallsend, Holmesville, Seahampton, Glendale, Barnsley, Elermore Vale, Wallsend, Kotara, Cardiff and Gateshead.

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