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REVENUE (Tables)
 9 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Performance obligation, recognition period
Below is a listing of performance obligations that arise from contracts with customers, along with details on the satisfaction of each performance obligation, the significant payment terms and the nature of the goods and services being transferred, by reporting segment and other business operations:
Revenue Recognized Over Time:
SegmentPerformance ObligationDescription
Natural Gas DistributionNatural gas utility sales
NJNG's performance obligation is to provide natural gas to residential, commercial and industrial customers as demanded, based on regulated tariff rates, which are established by the BPU. Revenues from the sale of natural gas are recognized in the period that gas is delivered and consumed by customers, including an estimate for quantities consumed but not billed during the period. Payment is due each month for the previous month's deliveries. Natural gas sales to individual customers are based on meter readings, which are performed on a systematic basis throughout the billing period. The unbilled revenue estimates are based on estimated customer usage by customer type, weather effects and the most current tariff rates. NJNG is entitled to be compensated for performance completed until service is terminated.

Customers may elect to purchase the natural gas commodity from NJNG or may contract separately to purchase natural gas directly from third-party suppliers. As NJNG is acting as an agent on behalf of the third-party supplier, revenue is recorded for the delivery of natural gas to the customer.
Clean Energy VenturesCommercial solar electricity
Clean Energy Ventures operates wholly-owned solar projects that recognize revenue as electricity is generated and transferred to the customer. The performance obligation is to provide electricity to the customer in accordance with contract terms or the interconnection agreement and is satisfied upon transfer of electricity generated.

Revenue is recognized as invoiced and the payment is due each month for the previous month's services.
Clean Energy VenturesResidential solar electricity
Clean Energy Ventures provides access to residential rooftop and ground-mount solar equipment to customers who then pay the Company a monthly fee. The performance obligation is to provide electricity to the customer based on generation from the underlying residential solar asset and is satisfied upon transfer of electricity generated.

Revenue is derived from the contract terms and is recognized as invoiced, with the payment due each month for the previous month's services.
Clean Energy VenturesTransition renewable energy certificates
Clean Energy Ventures generates TRECs, which are created for every MWh of electricity produced by a solar generator. The performance obligation of Clean Energy Ventures is to generate electricity and TRECs, which are purchased monthly by a REC Administrator.

Revenue is recognized upon generation.
Energy ServicesNatural gas services
The performance obligation of Energy Services is to provide the customer transportation, storage and asset management services on an as-needed basis. Energy Services generates revenue through management fees, demand charges, reservation fees and transportation charges centered around the buying and selling of the natural gas commodity, representing one series of distinct performance obligations.

Revenue is recognized based upon the underlying natural gas quantities physically delivered and the customer obtaining control. Energy Services invoices customers on a monthly basis in line with the terms of the contract and based on the services provided. Payment is due each month for the previous month's invoiced services.
Storage and Transportation
Natural gas services
The performance obligation of the Storage and Transportation segment is to provide the customer with storage and transportation services. The Storage and Transportation segment generates revenues from firm storage contracts and transportation contracts, related usage fees for the use of storage space, injection and withdrawal at the storage facility and the delivery of natural gas to customers. Revenue is recognized over time as customers receive the benefits of service as it is performed on their behalf using an output method based on actual deliveries.

Demand fees are recognized as revenue over the term of the related agreement.
Home Services and OtherService contracts
Home Services enters into service contracts with homeowners to provide maintenance and replacement services of applicable heating, cooling or ventilation equipment. All services provided relate to a distinct performance obligation which is to provide services for the specific equipment over the term of the contract.

Revenue is recognized on a straight-line basis over the term of the contract and payment is due upon receipt of the invoice.
Revenue Recognized at a Point in Time:
Storage and Transportation
Natural gas services
The performance obligation of the Storage and Transportation segment is to provide the customer with storage and transportation services. The Storage and Transportation segment generates revenues from hub services for the use of storage space, injection and withdrawal from the storage facility. Hub services include park and loan transactions and wheeling.

Hub services revenues are recognized as services are performed.
Home Services and OtherInstallationsHome Services installs appliances, including but not limited to, furnaces, air conditioning units, boilers and generators to customers. The distinct performance obligation is the installation of the contracted appliance, which is satisfied at the point in time the item is installed.

The transaction price for each installation differs accordingly. Revenue is recognized at a point in time upon completion of the installation, which is when the customer is billed.
Disaggregation of Revenue
Disaggregated revenues from contracts with customers by product line and by reporting segment and other business operations during the three months ended June 30, 2021 and 2020, is as follows:
(Thousands)Natural Gas DistributionClean Energy Ventures Energy ServicesStorage and TransportationHome Services
and Other		Total
2021
Natural gas utility sales$118,367 — — — — $118,367 
Natural gas services— — 4,041 11,649 — 15,690 
Service contracts— — — — 8,333 8,333 
Installations and maintenance— — — — 4,979 4,979 
Renewable energy certificates— 1,568 — — — 1,568 
Electricity sales— 7,346 — — — 7,346 
Eliminations (1)
— — — (650)(241)(891)
Revenues from contracts with customers118,367 8,914 4,041 10,999 13,071 155,392 
Alternative revenue programs (2)
577 — — — — 577 
Derivative instruments8,682 4,467 (3)197,553 — — 210,702 
Eliminations (1)
— — 922 — — 922 
Revenues out of scope9,259 4,467 198,475 — — 212,201 
Total operating revenues$127,626 13,381 202,516 10,999 13,071 $367,593 
2020
Natural gas utility sales$124,888 — — — — $124,888 
Natural gas services— — 3,536 11,863 — 15,399 
Service contracts— — — — 8,126 8,126 
Installations and maintenance— — — — 4,243 4,243 
Electricity sales— 5,294 — — — 5,294 
Eliminations (1)
— — — (720)(206)(926)
Revenues from contracts with customers124,888 5,294 3,536 11,143 12,163 157,024 
Alternative revenue programs (2)
(2,665)— — — — (2,665)
Derivative instruments6,309 8,102 (3)130,007 — — 144,418 
Eliminations (1)
— — 197 — — 197 
Revenues out of scope3,644 8,102 130,204 — — 141,950 
Total operating revenues$128,532 13,396 133,740 11,143 12,163 $298,974 
(1)Consists of transactions between subsidiaries that are eliminated in consolidation.
(2)Includes CIP revenue.
(3)Includes SREC revenue.
Disaggregated revenues from contracts with customers by product line and by reporting segment and other business operations during the nine months ended June 30, 2021 and 2020, is as follows:
(Thousands)Natural Gas DistributionClean Energy Ventures Energy ServicesStorage and TransportationHome Services
and Other		Total
2021
Natural gas utility sales$604,619 — — — — $604,619 
Natural gas services— — 21,480 38,679 — 60,159 
Service contracts— — — — 24,906 24,906 
Installations and maintenance— — — — 13,756 13,756 
Renewable energy certificates— 3,075 — — — 3,075 
Electricity sales— 16,616 — — — 16,616 
Eliminations (1)
— — — (1,976)(660)(2,636)
Revenues from contracts with customers604,619 19,691 21,480 36,703 38,002 720,495 
Alternative revenue programs (2)
(4,519)— — — — (4,519)
Derivative instruments33,422 6,536 (3)872,160 — — 912,118 
Eliminations (1)
— — (4,009)— — (4,009)
Revenues out of scope28,903 6,536 868,151 — — 903,590 
Total operating revenues$633,522 26,227 889,631 36,703 38,002 $1,624,085 
2020
Natural gas utility sales$611,650 — — — — $611,650 
Natural gas services— — 20,491 32,011 — 52,502 
Service contracts— — — — 24,237 24,237 
Installations and maintenance— — — — 13,404 13,404 
Electricity sales— 13,770 — — — 13,770 
Eliminations (1)
— — — (2,062)(947)(3,009)
Revenues from contracts with customers611,650 13,770 20,491 29,949 36,694 712,554 
Alternative revenue programs (2)
17,465 — — — — 17,465 
Derivative instruments16,260 11,833 (3)797,168 — — 825,261 
Eliminations (1)
— — (1,656)— — (1,656)
Revenues out of scope33,725 11,833 795,512 — — 841,070 
Total operating revenues$645,375 25,603 816,003 29,949 36,694 $1,553,624 
(1)Consists of transactions between subsidiaries that are eliminated in consolidation.
(2)Includes CIP revenue.
(3)Includes SREC revenue.

Disaggregated revenues from contracts with customers by customer type and by reporting segment and other business operations during the three months ended June 30, 2021 and 2020, is as follows:
(Thousands)Natural Gas DistributionClean Energy VenturesEnergy ServicesStorage and TransportationHome Services
and Other		Total
2021
Residential$79,054 2,904 — — 12,877 $94,835 
Commercial and industrial23,371 6,010 4,041 10,999 194 44,615 
Firm transportation15,052 — — — — 15,052 
Interruptible and off-tariff890 — — — — 890 
Revenues out of scope9,259 4,467 198,475 — — 212,201 
Total operating revenues$127,626 13,381 202,516 10,999 13,071 $367,593 
2020
Residential$89,095 2,587 — — 11,845 $103,527 
Commercial and industrial20,050 2,707 3,536 11,143 318 37,754 
Firm transportation14,331 — — — — 14,331 
Interruptible and off-tariff1,412 — — — — 1,412 
Revenues out of scope3,644 8,102 130,204 — — 141,950 
Total operating revenues$128,532 13,396 133,740 11,143 12,163 $298,974 
Disaggregated revenues from contracts with customers by customer type and by reporting segment and other business operations during the nine months ended June 30, 2021 and 2020, is as follows:
(Thousands)Natural Gas DistributionClean Energy VenturesEnergy ServicesStorage and TransportationHome Services
and Other		Total
2021
Residential$441,452 8,318 — — 37,315 $487,085 
Commercial and industrial95,424 11,373 21,480 36,703 687 165,667 
Firm transportation64,346 — — — — 64,346 
Interruptible and off-tariff3,397 — — — — 3,397 
Revenues out of scope28,903 6,536 868,151 — — 903,590 
Total operating revenues$633,522 26,227 889,631 36,703 38,002 $1,624,085 
2020
Residential$442,093 7,516 — — 35,955 $485,564 
Commercial and industrial107,107 6,254 20,491 29,949 739 164,540 
Firm transportation58,043 — — — — 58,043 
Interruptible and off-tariff4,407 — — — — 4,407 
Revenues out of scope33,725 11,833 795,512 — — 841,070 
Total operating revenues$645,375 25,603 816,003 29,949 36,694 $1,553,624 
Expected Timing of Performance
The timing of revenue recognition, customer billings and cash collections resulting in accounts receivables, billed and unbilled, and customers’ credit balances and deposits on the Unaudited Condensed Consolidated Balance Sheets during the nine months ended June 30, 2021 are as follows:
Customer Accounts ReceivableCustomers' Credit
(Thousands)BilledUnbilledBalances and Deposits
Balance as of October 1, 2020$134,173 $9,226 $25,934 
Increase (Decrease)71,309 3,437 (3,235)
Balance as of June 30, 2021$205,482 $12,663 $22,699 
Performance obligation, in excess of billings
The following table provides information about receivables, which are included within accounts receivable, billed and unbilled, and customers’ credit balances and deposits, respectively, on the Unaudited Condensed Consolidated Balance Sheets as of June 30, 2021:
(Thousands)Natural Gas DistributionClean Energy Ventures Energy ServicesStorage and TransportationHome Services
and Other		Total
Customer accounts receivable
Billed$76,254 5,524 118,234 3,662 1,808 $205,482 
Unbilled9,072 3,591 — — — 12,663 
Customers' credit balances and deposits(22,699)— — — — (22,699)
Total$62,627 9,115 118,234 3,662 1,808 $195,446