Corruption is defined by Transparency International (TI) as "the abuse of entrusted power for private gain.
Red Sky's contract with the Housing Executive ultimately expired due to the original three-month deadline on 14 July.
This led to individuals buying multiple boilers and running them nonstop, as the subsidy scaled with the number of renewable energy sources one was operating.
This continued until 2016, when the UK Treasury stated that Northern Ireland would be responsible for paying cost overruns related to the program.
[10] The scandal led to the resignation of Martin McGuinness from the post of deputy First Minister, and program auditors reported that they had suspended payments on more than half of the boilers they had inspected.