More than 4,000 Nova Scotia Power customers in Dartmouth were without power early Friday morning after a man climbed a transmission tower and had to be talked down by Halifax Regional Police.

Halifax Regional Police Staff Sgt. Bill Morris told CBC News the incident began shortly after 3 a.m. on Highway 111 near Mic Mac Mall.

"We had an officer sitting on Highway 111 doing radar, saw a vehicle travelling northbound at a very high rate of speed," he said Friday.

"The vehicle took the ramp to go to Burnside, lost control, ended up on a different ramp, flipped."

Highway 111, Nova Scotia

Morris said as officers approached the vehicle, a man got out, ran toward a nearby Nova Scotia Power transmission tower and started climbing about 18 metres up.

A negotiator was called and the man climbed down after about two hours. He was taken to the Dartmouth General Hospital to be checked out.

"Speed is definitely a factor but we're looking at alcohol as well," Morris said.

Nova Scotia Power disconnected power to about 4,000 customers as a precaution. Electricity has since been restored.

Halifax Regional Police said the ramp that runs from Highway 111 to Burnside was opened as of 7:15 a.m., while the ramp that runs off Victoria Road toward Halifax would be closed until approximately 8 a.m.