Following the supplier failures that occurred in 2021, Ofgem implemented further measures to strengthen the financial resilience of the market. In December 2021 Ofgem published an action plan on financial resilience that set out how Ofgem would improve its collection and reporting of information on suppliers, and also introduced stress tests to assess how robust suppliers would be to shocks.15 Subsequently, in April 2022 Ofgem published proposals to ring-fence customer credit balances and Renewables Obligations payments (which are made by suppliers that do not source a sufficient proportion of their energy from renewable sources), to reduce the scope for suppliers to operate with unsustainable business models and lower the cost consumers would have to pay if a supplier fails.16 11 C&AG’s Report, para 1.10 12 Qq 22–23, 25 13 Q 23; C&AG’s Report, para 3.7 and 3.9 14 Qq 23, 27, 75 15 C&AG’s Report, para 3.11; Ofgem, Action plan on retail financial resilience, 15 December 2021 16 C&AG’s Report, para 3.13; Ofgem, Renewables Obligation (RO) | Ofgem and Ofgem, Update to December Action Plan: Customer Credit Balances and Renewables Obligation protection, 14 April 2022 Regulation of energy suppliers 11