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Notes to the Consolidated Financial Statements (Tabular amounts in millions of Canadian dollars, except share and per share amounts) 

## 11. Cash and cash equivalents: 

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Included in the Company’s cash and cash equivalents is its proportionate share of its rights to cash and cash equivalents, which are restricted to use within its jointly controlled asset arrangements of $10 million (December 31, 2011 - $20 million). 

## 12. Trade and other receivables: 

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Details of the aging of trade receivables and analysis of the movement on the allowance for doubtful accounts are provided in note 30. 

## 13. Inventories: 

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Inventories expensed upon usage for the year ended December 31, 2012 of $48 million (year ended December 31, 2011 - $39 million) were charged to energy purchases and fuel, and other raw materials and operating charges. No write-downs of inventories were recognized in the year ended December 31, 2012 (year ended December 31, 2011 - nil). There were no reversals of previous write downs recognized in the year ended December 31, 2012 (year ended December 31, 2011 - nil). As at December 31, 2012, no inventories were pledged as security for liabilities (December 31, 2011 - nil). 

