Oil & Gas 13 Oct 2006 Vulcan sale, WildHorse float make Hercules a power player Bookmark Save articles for future reference. Subscribe to BN Log In Share to Facebook X LinkedIn Perth-based consortium Hercules Energy Pty Ltd has emerged as a key player in the junior energy sector, selling its Vulcan Geothermal Pty Ltd assets to Green Rock Energy Ltd today and revealed as the power behind new IPO WildHorse Energy Ltd.