- 45 - The gross amount of the Group’s fully depreciated buildings and equipment that was still in use as at December 31, 2021 amounted to Baht 33,048 million (2020: Baht 25,026 million). Security As at December 31, 2021, net book value of assets of the Group of Baht 36,539 million (2020: Baht 14,638 million) were registered to secured loan from financial institutions (see Note 19.2). In addition, the Group pledged some of the machinery, bank accounts and various rights as collateral as reported to the financial institutions. Property, plant and equipment under construction As at December 31, 2021, capitalised borrowing costs, relating to the acquisition of the land and the construction of the new factory, were included in a part of purchases of assets amounted to Baht 249 million in the consolidated statements of financial position (2020: Baht 947 million). The Group capitalised borrowing costs using the rates of 2.65% to 5.00% per annum (2020: 2.60% to 5.00% per annum). Impairment of assets in PTTGC America LLC For the year ended December 31, 2021, there is the conclusion of project feasibility study that some assets are inconsistency with current project feasibility study phase. The Group recognized impairment loss on assets under construction which included in property, plant and equipment amounted to Baht 1,833 million and other non-current assets amounted to Baht 54 million. 277 BUSINESS OPERATION AND PERFORMANCE CORPORATE GOVERNANCE FINANCIAL REPORTS AND FINANCIAL STATEMENTS APPENDIX
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