POWER for Mount Druitt Hospital will be supplied by generators for nine days from this weekend.
A high voltage switch will be installed for the new sterilisation unit as part of the hospital's upgrades.
"A new service had to be installed because of the age of the facility," nursing and midwifery director David Simmonds said.
"A lot of planning has gone into it.
"We have every reason to believe the plans in place will be successful."
While some parts of the hospital resemble a building site, officials are happy with the way construction is progressing.
Upgrades include an urgent care centre, oral health facility and rehabilitation ward.
"The new main entrance will be completed very soon," Mr Simmonds said.
"Everything is running smoothly."
All upgrades will be finished by February-March next year.
"We are building better services for the community," Mr Simmonds said.
"Its growing needs are recognised by the area health service and the state government. We have an extremely long waiting list for oral health."
There is no confirmed date for the Mount Druitt cardiac's ward move to Blacktown.
General manager Andrew Newton will be in touch with Mount Druitt volunteers over the coming weeks to discuss changes to the hospital.
Meanwhile, the hospital's performance is steadily improving, according to the Bureau of Health Information's latest quarterly report (April 2013-June 2013).
"At the Mount Druitt Campus, 100 per cent of patients requiring 'urgent' surgery, 100 per cent requiring 'semi-urgent', and 94 per cent requiring 'non-urgent' surgery received their surgery within the clinically recommended time-frame," Western Sydney Local Health District chief executive Danny O'Connor said.