The Information Commissioner fined the company £200,000 after making more than 6 million automated calls in a solar panel marketing campaign.
Julian Morgan, managing director of the price comparison, switching and advice service for householders and business energy users, said the case was further proof that unsolicited sales calls were not welcome by consumers and should be banned.
The Energy Advice Line has spearheaded a campaign for the energy regulator Ofgem to ban the practice of cold calling because it placed undue pressure on consumers to agree to energy deals that were not necessarily the cheapest available.