"We purposely cancelled National's tax cuts because we knew we needed to invest in things like health and education.
"It is worse than we thought though, when we look at the capital needs of hospitals and health in particular, but also the deficits the DHBs are facing. That is worse than I was anticipating."
She did not believe that former health minister Jonathan Coleman and National leader Simon Bridges were unaware of the capital underspending deficits DHBs faced.
"There's no way you could turn a blind eye to the deficits that everyone could see.
She said there was a more than $10 billion total capital deficit in health. "I would have thought a minister of health would probably know that."
Health Minister David Clark met the DHB last week.
He said today the problems with the power supply were not raised but he would receive information today.
"They have indicated that they're going to get back to me today with some advice about how they're managing building issues into the future."
He has also requested an asset register across the entire health system.
Clark laid the blame with the former government, saying it had prioritised tax cuts for the wealthy.
Bridges said today the previous National government had known the Counties-Manukau board was seeking more money but was not aware of the specific problems at the hospital.
"We did what we could, we continued to raise investment in that area. Now it's another go, clearly there'll be more investment but they've [the Government] talked about billions and billions of dollars, let's see what they do."
The Government recently approved an extra $11.5 million of funding to repair problems relating to Middlemore's rotting timber, leaks and mould - bringing the total cost of that project to $27.5 million.
The Counties-Manukau DHB said it had also budgeted to spend $3 million between 2017 and 2022 to increase the resilience of the hospital's power supply.
The New Zealand Nurses Organisation last week said it was worried mould in some hospital walls could escape into the building and become airborne.
Middlemore's maternity ward was also being monitored in case asbestos used in its construction was disturbed.
The ward is considered vulnerable because it was not built to a strength that meets modern earthquake standards.