With the coal supply from Yallourn's East Field mine expected to be exhausted in 2007, work commenced on a diversion of the nearby Morwell River in 2002 to enable access to further coal sources from the Maryvale coal field. Without this, the power station potentially faced significant modification or even closure. The Morwell River Diversion, and the access to coal supplies it allows, will ensure Yallourn can continue to operate until 2032. The diversion was constructed over five years at a cost of 122 million, and came in on time and on budget. On 6 June 2012, a levee bank failure resulted in the flooding of the Yallourn coal mine causing damage to its infrastructure and cutting fuel supply to the power station.