National Archives of AustraliaIn 2017, then-Prime Minister Malcolm Turnbull alighted from a helicopter to announce a grand plan: Snowy Hydro 2.0. It would turn the famous hydroelectric scheme into a giant battery, ready to power the green transition. Turnbull no doubt expected his announcement would associate his leadership with the positive aura of the enormous post-war Snowy scheme, since mythologised as the foremost nation-building achieveme…