XML 44 R31.htm IDEA: XBRL DOCUMENT v3.24.0.1
Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligations
NSP-Wisconsin’s AROs were as follows:
2023
(Millions of Dollars)Jan. 1, 2023Accretion
Cash Flow Revisions (a)
Dec. 31, 2023
Electric
Steam, hydro and other production$10 $— $(1)$9 
Distribution5 — — 5 
Natural gas
Distribution13 1 (6)8 
Total liability (b)
$28 $1 $(7)$22 
(a)In 2023, AROs were revised for changes in timing and estimates of cash flows. Changes in gas distribution AROs were a result of updated mileage of gas lines and number of services, as well as changes to inflation and discount rate assumptions.
(b)Included in other long-term liabilities balance in the consolidated balance sheet.
2022
(Millions of Dollars)Jan. 1, 2022Accretion
Cash Flow Revisions (a)
Dec. 31, 2022
Electric
Steam, hydro and other production$9 $1 $— $10 
Distribution5 — — 5 
Natural gas
Distribution12 — 1 13 
Total liability (b)
$26 $1 $1 $28 
(a)In 2022, AROs were revised for changes in timing and estimates of cash flows.
(b)Included in other long-term liabilities balance in the consolidated balance sheet.
Estimated Minimum Purchases Under Fuel Contracts
Estimated minimum purchases under these contracts as of Dec. 31, 2023:
(Millions of Dollars)RDF/woodNatural gas
supply		Natural gas
storage and
transportation
2024$6 $9 $21 
20251 — 19 
20261 — 19 
2027— — 13 
20281 — 3 
Thereafter1 — 8 
Total (a)
$10 $9 $83 
(a)Excludes additional amounts allocated to NSP-Minnesota through intercompany charges.
Estimated Minimum Purchases Under Fuel Contracts
(Millions of Dollars)RDF/woodNatural gas
supply		Natural gas
storage and
transportation
2024$6 $9 $21 
20251 — 19 
20261 — 19 
2027— — 13 
20281 — 3 
Thereafter1 — 8 
Total (a)
$10 $9 $83