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Revenue Recognition (Notes)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block] Revenue RecognitionWe recognize revenue when our performance obligations under contracts with customers have been satisfied, which generally occurs when our businesses have delivered or transported natural gas, electricity or propane to customers. We exclude sales taxes and other similar taxes from the transaction price. Typically, our customers pay for the goods and/or services we provide in the month following the satisfaction of our performance obligation. The following table displays our revenue by major source based on product and service type for the three months ended March 31, 2022 and 2021:
Three months ended March 31, 2022Three months ended March 31, 2021
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$34,481 $ $ $34,481 $33,272 $— $— $33,272 
Florida natural gas division10,266   10,266 8,956 — — 8,956 
FPU electric distribution19,089   19,089 18,551 — — 18,551 
FPU natural gas distribution30,020   30,020 26,861 — — 26,861 
Maryland natural gas division 10,464   10,464 10,466 — — 10,466 
Sandpiper natural gas/propane operations7,636   7,636 8,071 — — 8,071 
Elkton Gas3,366   3,366 2,635 — — 2,635 
Total energy distribution115,322   115,322 108,812 — — 108,812 
Energy transmission
Aspire Energy 18,036  18,036 — 12,905 — 12,905 
Aspire Energy Express263   263 47 — — 47 
Eastern Shore20,321   20,321 19,972 — — 19,972 
Peninsula Pipeline6,772   6,772 6,467 — — 6,467 
Total energy transmission27,356 18,036  45,392 26,486 12,905 — 39,391 
Energy generation
Eight Flags 5,539  5,539 — 4,329 — 4,329 
Propane operations
Propane delivery operations 75,606  75,606 — 55,264 — 55,264 
Compressed Natural Gas Services
Marlin Gas Services 2,209  2,209 — 2,352 — 2,352 
Other and eliminations
Eliminations(14,787)(98)(6,435)(21,320)(14,101)(91)(4,901)(19,093)
Other  132 132 — — 132 132 
Total other and eliminations(14,787)(98)(6,303)(21,188)(14,101)(91)(4,769)(18,961)
Total operating revenues (1)
$127,891 $101,292 $(6,303)$222,880 $121,197 $74,759 $(4,769)$191,187 
(1) Total operating revenues for the three months ended March 31, 2022, include other revenue (revenues from sources other than contracts with customers) of $0.1 million for both Regulated and Unregulated Energy segments, respectively, and $(0.3) million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended March 31, 2021. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper Energy and late fees.
Contract balances
The timing of revenue recognition, customer billings and cash collections results in trade receivables, unbilled receivables (contract assets), and customer advances (contract liabilities) in our condensed consolidated balance sheets. The balances of our trade receivables, contract assets, and contract liabilities as of March 31, 2022 and December 31, 2021 were as follows:
Trade ReceivablesContract Assets (Current)Contract Assets (Non-current)Contract Liabilities (Current)
(in thousands)
Balance at 12/31/2021$56,277 $18 $4,806 $747 
Balance at 3/31/202250,440 18 4,743 504 
Increase (decrease)$(5,837)$— $(63)$(243)
Our trade receivables are included in trade and other receivables in the condensed consolidated balance sheets. Our current contract assets are included in other current assets in the condensed consolidated balance sheet. Our non-current contract assets are included in other assets in the condensed consolidated balance sheet and primarily relate to operations and maintenance costs incurred by Eight Flags that have not yet been recovered through rates for the sale of electricity to our electric distribution operation pursuant to a long-term service agreement.

At times, we receive advances or deposits from our customers before we satisfy our performance obligation, resulting in contract liabilities. Contract liabilities are included in other accrued liabilities in the condensed consolidated balance sheets and relate to non-refundable prepaid fixed fees for our Mid-Atlantic propane delivery operation's retail offerings. Our performance obligation is satisfied over the term of the respective customer retail program on a ratable basis. For the three months ended March 31, 2022 and 2021, we recognized revenue of $0.4 million.

Remaining performance obligations
Our businesses have long-term fixed fee contracts with customers in which revenues are recognized when performance obligations are satisfied over the contract term. Revenue for these businesses for the remaining performance obligations, at March 31, 2022, are expected to be recognized as follows:
(in thousands)2022202320242025202620272028 and thereafter
Eastern Shore and Peninsula Pipeline$35,359 $44,475 $39,677 $33,050 $29,467 $25,228 $179,247 
Natural gas distribution operations5,010 5,681 5,458 4,928 4,745 4,406 27,089 
FPU electric distribution489 652 652 275 275 275 275 
Total revenue contracts with remaining performance obligations$40,858 $50,808 $45,787 $38,253 $34,487 $29,909 $206,611