8 Property, plant and equipment

8 Property, plant and equipment
CHF million Land and buildings Power gener- ation assets Transmission assets Other plant and equipment Assets under construction Total
Gross carrying amount at 31 December 2007 266 2,077 1,282 320 178 4,123
Acquisition / disposal of subsidiaries 7 8   8 6 29
Additions 13 20 40 83 277 433
Own work capitalised   2 3   63 68
Capitalised borrowing costs (3.5 % interest)         6 6
Transfers 34 11 18 37 – 100 0
Disposals – 12 – 5 – 20 – 30 – 2 – 69
Exchange differences – 9 – 167 – 1 – 27 – 19 – 223
Gross carrying amount at 31 December 2008 299 1,946 1,322 391 409 4,367
Acquisition / disposal of subsidiaries 67 2,149 279 6 147 2,648
Additions 15 29 49 71 440 604
Own work capitalised   1 1 8 69 79
Capitalised borrowing costs (3 % interest)         13 13
Transfers 16 44 28 18 – 90 16
Disposals – 14 – 1 – 20 – 34 – 4 – 73
Exchange differences – 1 10     – 7 2
Gross carrying amount at 31 December 2009 382 4,178 1,659 460 977 7,656
Accum. depreciation at 31 December 2007 78 629 720 207 0 1,634
Depreciation charge 7 92 44 42 1 186
Transfers     – 19 19   0
Disposals – 10 – 4 – 16 – 28 – 1 – 59
Exchange differences – 3 – 54   – 16   – 73
Accum. depreciation at 31 December 2008 72 663 729 224 0 1,688
Depreciation charge 9 152 56 52 3 272
Transfers 2 2   12   16
Disposals – 6 – 1 – 13 – 31 – 3 – 54
Exchange differences   2       2
Accum. depreciation at 31 December 2009 77 818 772 257 0 1,924
Net carrying amount at 31 December 2008 227 1,283 593 167 409 2,679
Net carrying amount at 31 December 2009 305 3,360 887 203 977 5,732
             

At the reporting date, the Group had contractual commitments of CHF312million (2008: CHF632 million) for the construction and acquisition of property, plant and equipment.