The Renewable Heat Incentive scandal (RHI scandal), also referred to as RHIgate and the Cash for Ash scandal, is a political scandal in Northern Ireland that centres on a failed renewable energy (wood pellet burning) incentive scheme that has been reported to potentially cost the public purse almost £500 million. The plan, initiated in 2012, was overseen by Arlene Foster of the Democratic Unionist Party (DUP), the then-Minister for Enterprise, Trade and Investment. Foster failed to introduce proper cost controls, allowing the plan to spiral out of control. The scheme worked by paying applicants to use renewable energy. However, the rate paid was more than the cost of the fuel, and thus many applicants were making profits simply by heating their properties.