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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations

Reconciliation of beginning and ending carrying amount of asset retirement obligations:

 

 

 

December 31,

 

(millions)

 

2019

 

 

2018

 

Beginning balance

 

$

64

 

 

$

47

 

Additional liabilities (1)

 

 

0

 

 

 

18

 

Liabilities settled (1)

 

 

(18

)

 

 

0

 

Revisions to estimated cash flows

 

 

0

 

 

 

(3

)

Other (2)

 

 

3

 

 

 

2

 

Ending balance

 

$

49

 

 

$

64

 

 

 

(1)

Tampa Electric produces ash and other by-products, collectively known as CCRs, at its Big Bend and Polk power stations. The increase in the ARO in 2018 is to achieve compliance with the EPA’s CCR rule, which contains design and operating standards for CCR management units, due to the closure of a CCR management facility that began in 2018 and was completed in 2019.

 

(2)

Includes accretion recorded as a deferred regulatory asset.