Accounting for Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Volumes Expected to Settle

The following table presents TEC’s derivative volumes that, as of December 31, 2017, are expected to settle during the 2018 fiscal year:

	Natural Gas Contracts
(millions)	(MMBTUs)
Year	Physical		Financial
2018		0		7