Green wall fire at Sydney CBD building

A fire on a green wall at the Sydney CBD building where the prime minister is scheduled to meet with electricity company bosses has been extinguished.

Smoke could be seen billowing from the five-metre vertical wall at the Bligh Street building just before 10am on Wednesday, a Fire & Rescue spokeswoman told AAP.

Three fire crews spent 20 minutes bringing the blaze under control using foam to put it out, she said.

Police closed Bligh Street as crews arrived.

Malcolm Turnbull is due to meet electricity company bosses over energy prices at the Commonwealth Parliamentary Offices in Sydney later in the morning.