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Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2022
26. Asset Retirement Obligations
Change in ARO	The change in ARO for the years ended December 31 is as follows: millions of dollars 2022 2021 Balance, January 1 $ 174 $ 178 Accretion included in depreciation expense 9 10 Change in FX rate 3 (1) Additions 1 1 Accretion deferred to regulatory asset (included in PP&E) 1 (2) Liabilities settled (1) (1) (13) Revisions in estimated cash flows (13) - Other - 1 Balance, December 31 $ 174 $ 174 (1) Tampa Electric produced ash and other by-products, collectively known as CCR's, at its Big Bend and Polk power stations. The decrease in ARO in 2021 was due to the closure of CCR management facilities.

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- Definition

Tabular disclosure of the carrying amount of a liability for asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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