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Short-Term Debt (Tables)
12 Months Ended
Dec. 31, 2017
Short-term Debt [Abstract]  
Schedule of Short-term Debt [Table Text Block]
millions of Canadian dollars 2017Weighted-average interest rate2016Weighted-average interest rate
TECO Energy/TECO Finance
Advances on revolving credit and term facilities$ 8202.58%$ 6851.74%
Tampa Electric Company
Advances on accounts receivable and revolving credit facilities 3822.07% 2281.49%
NMGC
Advances on revolving credit facilities 382.47% 351.71%
NSPI
Bank indebtedness 1-% 1-%
GBPC
Advances on revolving credit facilities - -% 125.75%
Short-term debt$ 1,241$ 961

The Company’s total short-term revolving and non-revolving credit facilities, outstanding borrowings and available capacity as at December 31 were as follows:
millions of Canadian dollarsMaturity20172016
TECO Energy/TECO Finance - term credit facility2018$ 502$ 537
TECO Energy/TECO Finance - revolving credit facility2022 376 403
Tampa Electric Company - revolving credit facility2022 408 436
Tampa Electric Company - accounts receivable revolving credit facility2018 188 201
Tampa Electric Company - term loan2018 377 -
NMGC - revolving credit facility2022 157 168
GBPC - revolving credit facilityVarious 16 17
Total 2,024 1,762
Less:
Advances under revolving credit and term facilities 1,241 960
Letters of credit issued within the credit facilities 3 3
Total advances under available facilities 1,244 963
Available capacity under existing agreements$ 780$ 799