Wild weather conditions are expected to ease in NSW over the coming days, with a shower or two possible for the state's northeast and the south coast.
The Bureau of Meteorology says storm activity which caused major destruction on Tuesday night has moved further north, with only a slim chance of a lightning strike occurring in the northeast for the rest of Wednesday.
Damaging winds of 111km/h hit North Head during Tuesday's storms with other areas also blasted by gusts over 100km/h.
Around 74,000 lightning strikes hit from 8pm to 2pm on Wednesday within a 100km radius of Sydney, according to Weatherzone.
Hail more than five centimetres in diameter battered Mittagong in the Southern Highlands while hail more than two centimetres hit Tuncurry on the mid-north coast and Wollongong south of Sydney.
The thunderstorms brought heavy bursts of rain with 66mm falling within two hours in the regional town of Coonabarabran and 50mm recorded in Nowra on the South Coast.
There were more than 900 calls to the State Emergency Service for help, with north Sydney suburbs worst affected.
A 37-year-old man died after being hit by a falling gas bottle that struck him about midnight when he was walking in The Rocks.
He later died at St Vincent's Hospital.
Endeavour Energy has restored power to more than 28,000 homes and business, with about 4000 customers, particularly in the Hawkesbury and outer parts of the Hill regions, still waiting to be restored.
The storm caused more than 450 electrical hazards and interrupted power supply to 60,000 homes and business in total.
"Crews are continuing to work hard in an effort to restore supply to a further 3000 customers tonight," an Endeavour Energy spokesman said in a statement on Wednesday.
Ausgrid, meanwhile, said it had restored power to more than 72,100 of 80,000 customers but anticipated some customers could remain without power into Friday.
Gale warnings have been issued for the Eden Coast, and strong wind warnings for Batemans Coast on Wednesday.
Hazardous surf warnings are in place for the Illawarra Coast, Batemans Coast and Eden Coast, with NSW Police Marine Area Command advising people to stay out of the water.