(4) Revenue

(a) Revenue from Contracts with Customers

All of the Partnership’s revenues are derived from service contracts with customers, and are recognized when the Partnership satisfies a performance obligation by delivering a service to a customer. Antero Resources is the Partnership’s most significant customer, and the Partnership expects to derive substantially all of its revenues from Antero Resources for the foreseeable future. The following sets forth the nature, timing of satisfaction of performance obligations, and significant payment terms of the Partnership’s contracts with Antero Resources.

Gathering and Compression Agreement

Antero Resources has dedicated all of its current and future acreage in West Virginia, Ohio and Pennsylvania to the Partnership for gathering and compression services except for acreage attributable to existing third-party commitments. The Partnership also has an option to gather and compress natural gas produced by Antero Resources on any acreage it acquires in the future outside of West Virginia, Ohio and Pennsylvania on the same terms and conditions. Under the gathering and compression agreement, the Partnership receives a low pressure gathering fee of $0.30 per Mcf, a high pressure gathering fee of $0.18 per Mcf, and a compression fee of $0.18 per Mcf, in each case subject to CPI-based adjustments since 2014. In addition, the agreement stipulates that the Partnership receives a reimbursement for the actual cost of electricity used at its compressor stations.

The Partnership satisfies its performance obligations and recognizes revenue when low pressure volumes are delivered to a compressor station, high pressure volumes are delivered to a processing plant or transmission pipeline, and compression volumes are delivered to a high pressure line. The Partnership invoices the customer the month after each service is performed, and payment is due in the same month.

Water Handling and Treatment Agreement

In connection with Antero Resources’ contribution of Antero Water and certain wastewater treatment assets to the Partnership in September 2015 (the “Water Acquisition”), the Partnership entered into a water services agreement with Antero Resources whereby the Partnership agreed to provide certain water handling and treatment services to Antero Resources within an area of dedication in defined service areas in Ohio and West Virginia. Antero Resources agreed to pay the Partnership for all water handling and treatment services provided by the Partnership in accordance with the terms of the water services agreement. The initial term of the water services agreement is 20 years from September 23, 2015 and from year to year thereafter until terminated by either party. Under the agreement, the Partnership receives a fixed fee of $3.685 per barrel in West Virginia and $3.635 per barrel in Ohio and all other locations for fresh water deliveries by pipeline directly to the well site, as well as $3.116 per barrel for fresh water delivered by truck to high-rate transfer facilities. All of these fees have been subject to annual CPI adjustments since the inception of the agreement in 2015. Antero Resources also agreed to pay the Partnership a fixed fee of $4.00 per barrel for wastewater treatment at the advanced wastewater treatment complex, in each case subject to annual CPI-based adjustments and additional fees based on certain costs.

Under the water services agreement, the Partnership may also contract with third parties to provide water services to Antero Resources. Antero Resources reimburses the Partnership for third party out-of-pocket costs plus a 3% markup.

The Partnership satisfies its performance obligations and recognizes revenue when the fresh water volumes have been delivered to the hydration unit of a specified well pad and the wastewater volumes have been delivered to the Partnership’s wastewater treatment facility. The Partnership invoices the customer the month after water services are performed, and payment is due in the same month. For services contracted through third party providers, the Partnership’s performance obligation is satisfied when the service to be performed by the third party provider has been completed. The Partnership invoices the customer after the third party provider billing is received, and payment is due in the same month.

Minimum Volume Commitments

Both the gathering and compression and water handling and treatment agreements include certain minimum volume commitment provisions, which are intended to support the stability of our cash flows. If and to the extent Antero Resources requests that the Partnership constructs new high pressure lines and compressor stations, the gathering and compression agreement contains minimum volume commitments that require Antero Resources to utilize or pay for 75% and 70%, respectively, of the capacity of such new construction for 10 years. Antero Resources also committed to pay a fee on a minimum volume of fresh water deliveries in calendar years 2016 through 2019. Antero Resources is obligated to pay a minimum volume fee to the Partnership in the event the aggregate volume of fresh water delivered to Antero Resources under the water services agreement is less than 120,000 barrels per day in 2018 and 2019. The Partnership recognizes revenue related to these minimum volume commitments at the time it is determined that the volumes will not be consumed by Antero Resources, and the amount of the shortfall is known.

Minimum revenue amounts under the minimum volume commitments are as follows (in thousands):


	Remainder		Year Ended December 31,
	of 2018		2019	2020	2021	2022	2023	Thereafter	Total
Minimum revenue under the Gathering and Compression Agreement	$	24,351	158,725	159,160	158,725	158,725	158,725	498,917	1,317,328
Minimum revenue under the Water Handling and Treatment Agreement		—	165,564	—	—	—	—	—	165,564
Total	$	24,351	324,289	159,160	158,725	158,725	158,725	498,917	1,482,892

(b) Disaggregation of Revenue

In the following table, revenue is disaggregated by type of service and type of fee (in thousands). The table also identifies the reportable segment to which the disaggregated revenues relate. For more information on reportable segments, see Note 14—Reportable Segments.


	Three Months Ended September 30,				Nine Months Ended September 30,				Segment to which
	2017		2018		2017		2018		revenues relate
Revenue from contracts with customers
Type of service
Gathering—low pressure	$	46,153		63,884	$	141,783		174,539	Gathering and Processing
Gathering—high pressure		33,365		38,409		90,095		102,714	Gathering and Processing
Compression		21,000		30,909		58,997		82,262	Gathering and Processing
Condensate gathering		—		—		64		—	Gathering and Processing
Fresh water delivery		48,352		68,144		156,635		222,367	Water Handling and Treatment
Wastewater treatment		—		5,260		—		8,431	Water Handling and Treatment
Other fluid handling		44,759		59,599		114,591		155,875	Water Handling and Treatment
Total	$	193,629		266,205	$	562,165		746,188
Type of contract
Fixed Fee	$	100,518		133,202	$	290,939		359,515	Gathering and Processing
Fixed Fee		48,352		73,404		156,635		230,798	Water Handling and Treatment
Cost plus 3%		44,759		59,599		114,591		155,875	Water Handling and Treatment
Total	$	193,629		266,205	$	562,165		746,188

Gain on sale of assets		—		—		—		583	Gathering and Processing
Total revenue	$	193,629		266,205		562,165		746,771

The majority of the Partnership’s service contracts have a term greater than one year. As such, the Partnership has utilized the practical expedient in ASC 606, which states that a company is not required to disclose the transaction price allocated to remaining performance obligations if the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Under the Partnership’s service contracts, each unit of product delivered to the customer represents a separate performance obligation; therefore, future volumes are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not required.

The remainder of our service contracts, which relate to contracts with third parties, are short-term in nature with a contract term of one year or less. The Partnership has utilized an additional practical expedient in ASC 606, which exempts the Partnership from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less.

(d) Contract Balances

Under the Partnership’s service contracts, the Partnership invoices customers after its performance obligations have been satisfied, at which point payment is unconditional. Accordingly, the Partnership’s service contracts do not give rise to contract assets or liabilities under ASC 606. At December 31, 2017 and September 30, 2018, the Partnership’s receivables with customers were $110 million and $116 million, respectively.