The EU Renewable Energy Directive and Irish legislation permit the use of GOs.Though using GOs is legal and overseen by the energy regulator in Ireland, ASAI found claims companies were supplying 100 per cent renewable power were misleading to customers.The advertising watchdog said six sections of its advertiser's code of conduct had been broken including one section that says "advertisers should not exploit the credulity, inexperience or lack of knowledge of consumers".