SM,

From the ABC:

http://www.abc.net.au/2017-03-30/hazelwood-power-plant-shutdown-explained/8379756

Taken from the link:

"After 50 years of supplying Victoria with cheap electricity,
the plant's owners - ENGIE announced late last year that
the site was no longer economically viable..."

"Documents released to the ABC revealed the scale of
improvements that would be needed to bring the plant up to
scratch."

"With WorkSafe Victoria ordering ENGIE to repair five out of
the eight boilers to meet work health and safety standards."

"ENGIE said it would cost at least $743 million to
rehabilitate the site. That includes $439 million for the mine
and $304 million for the power station site."

Read the given website for more information.

cont'd ...

oops - I left out news:

Here's the site again:

http://www.abc.net.au/news/2017-03-30/hazelwood-power-plant-shutdown-explained/8379756