The power giant has swung to a heavy loss after a chaotic 12 months for the east-coast energy market. : We’re sorry, this feature is currently unavailable. We’re working to restore it. Please try again later. Power giant AGL has sunk to a $1.26 billion full-year loss after a chaotic 12 months for the east-coast energy market, but is flagging a sharp lift in earnings as electricity prices rise and reliability improves across its coal-fired power stations.