Thargomindah's water supply is provided by a sealed bore, just out of town. The "new" bore was started in 1999, to replace the original one which had been in use since 1893.
I particularly wanted to see the Hydro Power Plant but we'd lucked out - again! As well as the usual summer-time maintenance, the old bore is to be permanently capped (which involves blasting and a then a large volume of cement). There is still hope for another Thargomindah visit before May and hopefully we'll get to see the famous Hydro Power Plant then! Third time/visit lucky?!