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The government's target of producing 20% of UK energy from renewable sources by 2020 was slammed by the Royal Academy of Engineering this week. It says the target is 'hopelessly unrealistic' because of the unreliability of 'intermittent' renewable sources such as wind and waves. The report warns the UK could end up importing more natural gas to make up the shortfall, costing the government an estimated £13bn annually by 2020.