17.1 Other non-current assets
| (in PLNm) | As at December 31, 2022 | As at December 31, 2021 |
|---|---|---|
| Advances for property, plant and equipment | 615 | 749 |
| Cost to acquire customers | 102 | 106 |
| Other non-current assets | 133 | 18 |
| TOTAL OTHER ASSETS | 850 | 873 |
The calculations for property, plant and equipment under construction mainly relate to the modernisation of the Porąbka-Żar pumped storage plant by PGE Energia Odnawialna S.A., the construction of two gas and steam units by PGE Gryfino 2050 sp. z o.o. and investments made in the district heating segment. Customer acquisition costs relate to the co-financing by PGE Energia Ciepła S.A. of investments in the development of district heating networks and agency commissions at PGE Obrót S.A. Other non-current assets mainly include advance payments for CO2 deliveries.