Hazelwood was due to begin unit-by-unit retirement in 1996/1997 when it was only around 30 years old, but this was replaced with a significant station refurbishment program because it was seen as having a far lower risk.
This ran counter to the SECV's intention to build Latrobe Valley power stations with short lifespans (30-40 years) that would 'move' with the mining operations, updating the power station technology as they went instead of complicated in-situ refurbishments.
Instead, Hazelwood is consuming coal from the mining area that the Driffield stations were meant to be using.
Loy Yang B2 or would that be "C" was also meant to be built
Every document I've seen refers to the 'completion' of Loy Yang B as Loy Yang B Units 3 & 4. Loy Yang C is different altogether - it was a possible third power station to be built to the east of the existing units, relying on a significant eastward expansion of the Loy Yang Mine. It was studied as an alternative to Driffield back in the late 70s/early 80s.
And to make things even more complicated, HRL's much more recent Integrated Gasification Combined Cycle plant (which burns brown coal as a gas in a big jet engine) was also to be named Driffield!
Anyhow, the time for building new power stations in the 'Valley has passed. HRL's Driffield project was the last real shot at a 'greenfields' coal-burning plant, EnergyAustralia's Yallourn Combined Cycle Gas Turbine plant (burning Bass Strait gas) has fallen over thanks to 'market forces' and there doesn't seem to be any progress on the proposed Hazelwood coal-fired ultra-supercritical pilot plant.