Hundreds of Sydney home owners will be out inspecting damage to their properties on Thursday with rain and even a possible storm hindering the clean-up.

Some 1700 homes were still without power on Thursday morning, down from some 33,000 houses and businesses at the peak of Wednesday's storm, Endeavour Energy said. Ausgrid, meanwhile, was working to restore electricity to about 170 homes on the Central Coast.

Those without electricity in Sydney are mostly in the Penrith, Hills and Mt Druitt areas, which were also among the suburbs with the most call-outs for the State Emergency Service.

"We are expecting some further storms this afternoon," Phil Campbell, an SES spokesman, said.