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Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Interests In Other Entities [Abstract]  
Investments in joint ventures and associates
The change in investments is as follows:
SkookumchuckEMGTotal
Balance, Dec. 31, 2019— — — 
Contributions(1)
86 16 102 
Equity income 1 — 1 
Change in foreign exchange rates(2)(1)(3)
Balance, Dec. 31, 202085 15 100 
(1) Contributions were paid in US dollars and were US$66 million for Skookumchuck and US$12 million for EMG, including contingent consideration.
Summarized financial information on the results of operations relating to the Corporation’s pro-rata interests in Skookumchuck and EMG is as follows:
Year ended Dec. 312020
Results of operations
Revenues3 
Expenses(2)
Proportionate share of net earnings1 

On Nov. 25, 2020, TransAlta purchased a 49 per cent interest in Skookumchuck, a 136.8 MW wind facility located in Lewis and Thurston counties near Centralia in Washington state consisting of 38 Vestas 136 wind turbines. Summarized financial information relating to 100 per cent of Skookumchuck, including adjustments for the application of consistent accounting policies and the Corporation’s purchase price adjustments, is as follows:
Year ended Dec. 312020
Revenues6 
Depreciation and amortization2 
Interest expense1 
Net earnings3 
Other comprehensive loss— 
Total comprehensive loss3 
As at Dec. 312020
Current assets6 
Non-current assets382 
Current liabilities(65)
Non-current liabilities(150)
Net assets173 
Additional items included above
Cash and cash equivalents1 
Current financial liabilities(1)
(27)
Non-current financial liabilities(1)
(147)
(1) Excludes trade and other payables and provisions.

A reconciliation of the carrying amount to the Corporation’s 49 per cent interest in the Skookumchuck is as follows:
As at Dec. 312020
Net assets173 
Less: 51 per cent of Skookumchuck net assets not owned by the Corporation(88)
Net investment85 
Disclosure of commitments and future payments
Skookumchuck's approximate future payments under contractual commitments are as follows:
 202120222023202420252026 and thereafterTotal
Long-term service agreements(1)
1 1 1 1 1 28 33 
(1) Refer to Note 36 for further details on long-term service agreements.
In addition to commitments disclosed elsewhere in the financial statements, the Corporation has incurred the following additional contractual commitments, either directly or through its interests in joint operations. Approximate future payments under these agreements are as follows:
 202120222023202420252026 and thereafterTotal
Natural gas, transportation and
other contracts		141 149 137 134 134 1,353 2,048 
Transmission8 8 8 5 5 1 35 
Coal supply and mining
agreements		81 105 101 67 56 — 410 
Long-term service agreements31 37 22 18 10 55 173 
Operating leases4 2 2 1 1 26 36 
Growth509 411 93 — — — 1,013 
TransAlta Energy Transition Bill6 6 6 — — — 18 
Total780 718 369 225 206 1,435 3,733