Governments might instead choose to capture the rents associated with cheap electricity sources through state taxes, which could be used to promote green growth priorities, and encouraging a longer-term more sustainable industry structure, whilst building financial reserves to help tackle future energy-sector decarbonisation. In this sense, the dilemmas and solutions are similar to those facing oil-exporting nations (Box 3.1). The energy system comprises a consistent network of supply chains, physical infrastructure, user practices, markets and regulatory systems (Kemp, 1994).