JOHANNESBURG (Reuters) - Construction on South Africa's Medupi power plant had not restarted on Thursday as expected but normal operations for building the plant should soon be restored, a spokeswoman for state-owned utility Eskom said."The site is open. The site is safe. We have asked the contractors to start mobilising the workers and restoring normal operations," spokeswoman Hilary Joffe told Reuters. She did not say exactly when construction would resume.Eskom a day earlier said it anticipated construction would restart on Thursday after work was stopped last week because of labour protests.The plant is supposed to start producing power by late this year and is crucial for easing tight supplies in Africa's biggest economy.