When the sun doesn't shine and the wind doesn't blow, seawater could keep South Australia powering on.

One of the nation’s biggest electricity industry players is looking at building a pumped-hydro generator in South Australia’s Spencer Gulf, near industry hotspots Whyalla, Port Augusta and Port Pirie. The federal government has offered Energy Australia $450,000 in taxpayer funds to help with a feasibility study and hinted there could…