In applying IAS 36, impairment assessments are performed whenever events or changes in circumstances indicate that the carrying amount of an asset or CGU may not be recoverable. Management, in particular, have identified and track indicators such as the movement in group market capitalisation, volatility in exchange rates, commodity prices and the economic environment in which the businesses operate, to assess whether there is an indication of impairment.
Estimates are made in determining the recoverable amount of assets which includes the estimation of cash flows and discount rates used. In estimating the cash flows, management bases its cash flow projections on reasonable and supportable assumptions that represent management's best estimate of the range of economic conditions that will exist over the remaining useful life of the assets. The discount rates used reflect the current market assessment of the time value of money and the risks specific to the assets for which the future cash flow estimates have not been adjusted.
Judgements were required in the determination of key variables and future market conditions, particularly in relation to the parameters included in the following table:
|Discount rate (%)1||14.30%||14.30%|
|Rand/US$ exchange rate||R15.90 to R16.39||R15.25 to R15.74|
|Coal API4 long-term price (per tonne)||US$82.00||US$78.00|
|Coal domestic selling price range (per tonne)||R900 to R1 300||R800 to R1 200|
|1||2021: The discount rate was revised from 13.80% to 14.30% to take into account a material shift in strategy, changes in sovereign country risk and due to the revised targeted capital structure.|
Management considered and assessed reasonably possible changes to the key assumptions and have not identified any instances that could cause the carrying amount of the coal operations to exceed its recoverable amount.
Refer note 10.2.2 for details of the impairment testing performed on the Cennergi CGU.