88 Consolidated  Notes to the  Financial  Statements Note 20 – Property, plant and equipment (continued) Depreciation expense Impairment loss Leased plant and equipment Property, plant and equipment under construction Depreciation expense of $104.2 million (2010: $92.6 million) is included in the line item ‘depreciation and amortisation’ in the  income statement. No impairment loss has been recognised for the year ended 30 June 2011. In the 2010 financial year, the consolidated entity reviewed the recoverable amount of assets associated with its outsourced information  technology infrastructure services. The consolidated entity was in the process of transitioning to a new service provider, and as a result, an  impairment loss of $7.8 million was recognised to write-off the carrying amount of certain information technology assets. In the 2010 financial year, the consolidated entity reviewed the recoverable amount of a certain landfill gas extraction site within the  Merchant Energy business. Due to lower than anticipated landfill gas at the site, and based on future cash flow forecasts, an impairment loss  of $0.6 million was recognised to reduce the carrying amount of plant and equipment to its recoverable amount. The impairment loss of $nil (2010: $8.4 million) is included in other expenses in the line item ‘impairment of property, plant and equipment’  in Note 6. The net carrying amount of plant and equipment disclosed above includes plant and equipment held under finance leases of $134.3 million  (2010: $138.3 million). The net carrying amount of plant and equipment disclosed above includes expenditure recognised in relation to plant and equipment which  is in the course of construction of $424.0 million (2010: $220.4 million). Customer Wind farm relationships development Goodwill  Licences and  contracts  rights  Other  Total $m $m $m $m $m $m Note 21 – Intangible assets Year ended 30 June 2011 Balance at 1 July 2010, net of accumulated amortisation  2,624.8 301.2 183.6 37.3 2.1 3,149.0 Additions  – – 15.6 – – 15.6 Transferred to property, plant and equipment (Note 20)  – – – (6.4) – (6.4) Amortisation expense  – – (20.9) – (0.1) (21.0) Balance at 30 June 2011, net of accumulated amortisation  2,624.8 301.2 178.3 30.9 2.0 3,137.2 Balance at 1 July 2010 Cost (gross carrying amount)  2,624.8 301.2 248.3 37.3 3.7 3,215.3 Accumulated amortisation  – – (64.7) – (1.6) (66.3) Net carrying amount  2,624.8 301.2 183.6 37.3 2.1 3,149.0 Balance at 30 June 2011 Cost (gross carrying amount)  2,624.8 301.2 263.9 30.9 3.7 3,224.5 Accumulated amortisation  – – (85.6) – (1.7) (87.3) Net carrying amount  2,624.8 301.2 178.3 30.9 2.0 3,137.2 Year ended 30 June 2010 Balance at 1 July 2009, net of accumulated amortisation  2,624.4  301.2  204.9  28.4  2.2  3,161.1 Acquisitions through business combinations (Note 42)  0.4  –  –  8.9  –  9.3 Amortisation expense  –  –  (21.3)  –  (0.1)  (21.4) Balance at 30 June 2010, net of accumulated amortisation  2,624.8  301.2  183.6  37.3  2.1  3,149.0 Balance at 1 July 2009 Cost (gross carrying amount)  2,624.4  301.2  248.3  28.4  3.7  3,206.0 Accumulated amortisation  –  –  (43.4)  –  (1.5)  (44.9) Net carrying amount  2,624.4  301.2  204.9  28.4  2.2  3,161.1 Balance at 30 June 2010 Cost (gross carrying amount)  2,624.8  301.2  248.3  37.3  3.7  3,215.3 Accumulated amortisation  –  –  (64.7)  –  (1.6)  (66.3) Net carrying amount  2,624.8  301.2  183.6  37.3  2.1  3,149.0