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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations

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

 

 

 

December 31,

 

(millions)

 

2018

 

 

2017

 

Beginning balance

 

$

47

 

 

$

45

 

Additional liabilities (1)

 

 

18

 

 

 

1

 

Liabilities settled

 

 

0

 

 

 

(1

)

Revisions to estimated cash flows

 

 

(3

)

 

 

0

 

Other (2)

 

 

2

 

 

 

2

 

Ending balance

 

$

64

 

 

$

47

 

 

 

(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 in 2018. Tampa Electric submitted a petition to the FPSC in December 2018 for recovery of the costs associated with this ongoing project and the petition is currently under review.

 

(2)

Includes accretion recorded as a deferred regulatory asset.