Visited the Powerstation Electricity Museum at 216 Peel Street, Tamworth, last time we were there.
If I remember correctly Tamworth was the first city in Australia with electric street lighting.
Spent a couple of hours looking around - They still start up the old steam engine generator if you are lucky enough to be there on the right day.
There is an admission charge, but as it is run by knowledgable volunteers I considered the $7 family admission for 3 of us good value.
Also found the Motorcycle Museum interesting and just down the road from Austin Caravan Ground.
Cliff