NOTES TO CONSOLIDATED FINANCIAL STATEMENTS Hydro One presents its benefit obligations and plan assets net on its Consolidated Balance Sheets within the following line items: Post-Retirement and Pension Benefits  Post-Employment Benefits  December 31 (millions of Canadian dollars) 2013 2012 2013 2012 Accrued liabilities  – – 43 43 Pension benefit liability  845 1,515 – – Post-retirement and post-employment benefit liability  – – 1,488 1,416 Unfunded status  845 1,515 1,531 1,459 The funded or unfunded status of the pension, post-retirement and post-employment benefit plans refers to the difference between the fair  value of plan assets and the projected benefit obligations for the Plans. The funded/unfunded status changes over time due to several factors,  including contribution levels, assumed discount rates and actual returns on plan assets. The following table provides the projected benefit obligation (PBO), accumulated benefit obligation (ABO) and fair value of plan assets for the Pension Plan: December 31 (millions of Canadian dollars) 2013 2012 PBO  6,576 6,507 ABO  5,998 6,074 Fair value of plan assets  5,731 4,992 On an ABO basis, the Pension Plan was funded at 96% at December 31, 2013 (2012 – 82%). On a PBO basis, the Pension Plan was  funded at 87% at December 31, 2013 (2012 – 77%). The ABO differs from the PBO in that the ABO includes no assumption about future  compensation levels. Components of Net Periodic Benefit Costs The following table provides the components of the net periodic benefit costs for the years ended December 31, 2013 and 2012 for the Pension Plan: Year ended December 31 (millions of Canadian dollars) 2013 2012 Current service cost, net of employee contributions  141 96 Interest cost  278 285 Expected return on plan assets, net of expenses  (309) (289) Actuarial loss amortization  175 112 Prior service cost amortization  2 3 Net periodic benefit costs  287 207 Charged to results of operations 1 72 76 1  The Company follows the cash basis of accounting consistent with the inclusion of pension costs in OEB-approved rates. During the year ended December 31, 2013,  pension costs of $160 million (2012 – $163 million) were attributed to labour, of which $72 million (2012 – $76 million) was charged to operations, and $88 million  (2012 – $87 million) was capitalized as part of the cost of property, plant and equipment and intangible assets. HYDRO ONE ANNUAL REPORT 2013 80