8.3 Contingent assets and liabilities
| Contingent asset | 2021 | 2020 |
|---|---|---|
| Estimated amount | ||
| Grants awarded | 144 | 182 |
| Other contingent assets | 13 | 13 |
| Total | 157 | 195 |
The carrying amount of contingent assets in the reporting period was mainly attributable to the co-financing granted to Polska Spółka Gazownictwa Sp. z o.o. for the construction of gas pipelines as part of the gas network roll-out process.
| Contingent liabilities | 2021 | 2020 |
|---|---|---|
| Estimated amount | ||
| Guarantees and sureties | 8,276 | 4,830 |
| Promissory notes | 558 | 554 |
| Other | 14 | 9 |
| Total | 8,848 | 5,393 |
As at the end of 2021, the largest item of contingent liabilities was a guarantee issued by the parent for the benefit of the Norwegian State in connection with PUN’s work on the Norwegian Continental Shelf, whose carrying amount as at the end of 2021, as translated at the exchange rate quoted by the NBP for December 31st 2021, was PLN 2,286m (PLN 2,896m as at the end of 2020) and was disclosed in the line item Guarantees and sureties.
The increase in contingent liabilities under sureties and guarantees issued in the reporting period was principally due to the guarantees of PLN 1,592m (as translated at the exchange rate quoted by the NBP for December 31st 2021) issued as security for the LNG vessel charter contracts and the issuance of new guarantees securing gas deliveries for a total amount of PLN 1,842m (at the exchange rate quoted by the NBP for December 31st 2021).