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Guide for UnitAgreementsEstablishing and maintaining a unit-type agreement, includingCommercial Gas Storage Unit AgreementsStandard Unit AgreementAn agreement among all the working interest ownersand royalty owners in an oil and/or gas pool for theco-operative operation and development of the pool.Required Technical Data More Information:For more information on policies, technicalrequirements, and unit terminologies, pleaserefer to “Crown Involvement in Units” and“Description of Unit Terminologies” in this Guide.Unit Agreement ProposalA proposal can be submitted at any time but mustnot proceed to the final execution stage withoutAlberta Energy’s authorization.Proposals must be submitted in person, mailed or bycourier. Edmonton office:Alberta Energy11th Floor, North Petroleum Plaza9945 – 108 St. NWEdmonton, AB T5K 2G6OR Calgary office:Alberta Energy3rd Floor, AMEC Place801 – 6th Ave SWCalgary, AB T2P 3W2 2018 Government of Alberta Updated: July 12, 2022 Pages 1 of 11Classification: Publicproposed and detailed calculation of tractfactorstechnical information that explains:o the pool being unitized such as netpay and structure mapping, crosssections, engineering andgeophysical datao the extent of the poolo presence of a gas capo Alberta Energy Regulator (AER)water flood application and projectarea approvalPoints to consider when submitting astandard unit agreement proposal: PNG Agreement must be continuedindefinitely under section 15 of the PNGTenure Regulation. Primary term leases and intermediate termlicences can be included in a proposed unitagreement. These PNG Agreements shouldbe monitored while the unit negotiations areproceeding to ensure any expiries duringthat period are dealt with. PNG Agreementsare not automatically continued when theyare within a proposed unit agreement.
An initial term licence cannot be included ina standard unit agreement or a commercialgas storage unit agreement; however, it canbe included in a Production Allocation UnitAgreement (PAUA).A standard unit agreement cannot beexecuted retroactively. The unit agreementbecomes effective on the first of the monthfollowing execution by all required workinginterest owners and royalty owners,including the Crown.new effective date is required. The effective dateMUST be on the first day of the month.Note: The effective date affects royalty calculation.If the unit agreement is effective during the month, itis treated for royalty purposes that it is effective forthe full month, as calculations are done on a monthlybasis.The unit operator must revise an Exhibit A wheneverthere is a change in WIO, sale of interest, partialtransfer of interest, change in royalty interest,corporate status changes such as name change,amalgamation of companies, struck or dissolved.Unit Tract CalculationThe basis for determining tract factors, particularly ina unit agreement containing both Crown andfreehold lands, must be equitable and technicallyjustifiable. In some cases, remaining reserves maybe acceptable. However, the use of severalparameters such as original hydrocarbon porevolume, remaining reserves and productivity isencouraged if they produce a better result. A formulathat heavily penalizes undrilled lands or relies mainlyon surface area is normally not acceptable to AlbertaEnergy as the basis for tract participation.The overall Unit Participation Percentage for aWorking Interest Owner (WIO) is taken from ExhibitA. All of the tracts that the WIO has an interest in areadded together. This calculates the overall UnitParticipation Percentage for the WIO.The Crown interest is calculated as:(WIO participation % in all Crown Tracts WIOparticipation % in all Tracts) x 100Exhibit A (Unit Tract)Alberta Energy requires an effective date on theExhibit A and all subsequent revisions and must beconsistent with the WIO Summary effective date.When changes are made to ownership (WIO orroyalty owner), the Exhibit A must be revised and a 2018 Government of Alberta Updated: July 12, 2022 Pages 2 of 11Classification: PublicThe unit operator can change the numberingconvention as long as the numbering system isconsistent and in sequential numbering after thechange.For example, from a revision number to a dateRevision no. 01, was changed later to a date2018-01. The next revision number would then be2018-02, then 2018-03, etc.The revisions submitted to Alberta Energy must bein chronological order. The current revision receivedshould be of a later date than the previous one onfile.E-submissions of Exhibit ARevisionsElectronic submission has been mandatory sinceMarch 7, 2016, for changes of unit operatorship, unittract revision and correction of Exhibit A.You can submit a revision request by logging intothe Alberta Energy’s Electronic Transfer System(ETS), which gives you access to the "UnitAgreement Exhibit A" node.Through ETS, you can submit a correction to ExhibitA by accessing Unit Agreement Exhibit A node andUnit Tract Revision node.
Once your request is received by Alberta Energy,the ETS request status will change to “Processing”.An email notification will be sent to the Unit operatorinforming them that the request is “completed” whenit has been processed.When your request is rejected, Alberta Energy willreceive a similar email notification. We will reviewthe issue. Once it is resolved, we will contact theinitiator of the request.You can acquire a copy of the revised Exhibit Athrough ETS. In order for you to be able to requestan Exhibit A report form type, a submitter and viewerroles set-up in ETS is required.As a unit operator, it is your responsibility to providea copy of the completed revised Exhibit A to AER asstated in the models (PAUA clause 2.2 and UnitAgreement clause 206).When a unit operator and one of the WIOs are in theprocess of amalgamation, a revision can only besubmitted under the new resulting company nameonce Alberta Energy’s records are updated with theamalgamation information.The unit operator is responsible for preparingand distributing a revised Exhibit A and ensuringall parties to the Unit agreement receive thesame revised Exhibit A including the AER.Contact Information:Exhibit A’s can be revised and updates wll beprocessed if the change occurs in an openproduction year. Changes will not beprocessed in statute barred years. For moreinformation contact Royalty Operations, at780-422-8727 or email VCR@gov.ab.caFor any ETS Request rejected, you may emailthe helpdesk atEnergyUnitsHelpdesk@gov.ab.caand you will be advised of the next step(s). 2018 Government of Alberta Updated: July 12, 2022 Pages 3 of 11Classification: PublicCounterpart Execution PagesAs per the Mines and Minerals AdministrationRegulation, section 23.3(3) and 23.5(1), unitoperator can submit signed and dated executionpages electronically.All signed and dated execution pages must becombined into a single PDF and submitted underone email to EnergyUnitsHelpdesk@gov.ab.ca. Inthe email Subject line, include the Crown assignedunit name and number.Alberta Energy will reply to the email andacknowledge receipt.Production Allocation UnitAgreement (PAUA)A PAUA is a unit-type agreement used for a singlewell that crosses multiple drilling spacing units ofmixed ownership (Crown and Freehold). The PAUAensures that the royalty payments from one well aredistributed to both royalty owners in a fair andequitable manner.Initial term licences can be included in PAUA.However, at expiry of the initial term licence, thecompany must meet the criteria for validating into anintermediate term pursuant to section 9(1) of thePNG Tenure Regulation. If the criteria is not met, thelicence will be cancelled and the PAUA will bereviewed for unit termination pursuant to clause 10.4of the PAUA document.Exhibit AThe Exhibit A template was modified to add a newcolumn, “Share of Royalty Interest Owner (%).” Eachfreehold royalty interest owner can indicate itsownership % in respect of the overall TractParticipation determined for freehold. For freeholdowners, there might be one or more owners listedwith their respective ownership % indicated.
Alberta Energy does not validate or use thesenumbers. The Crown column will always indicate100%.For more information, please refer to the DeviatedWell or Horizontal Well PAUA model guides.Execution of PAUAUnlike a standard unit agreement, a PAUA can beexecuted retroactively. A PAUA must becomeeffective at 0800 on the first day of the first calendarmonth which is the earliest of: the month in which production of productionallocation substances from the wellcommences, or the month following the date of executionand delivery of the agreement by the ownersof one hundred percent (100%) of theWorking Interest and one hundred percent(100%) of the Royalty Interest within theproduction allocation area.PAUA’s can be executed retroactively; therefore,in order to determine the proposed unitizedsubstance and zone, the well must be placed onproduction for 3 months before Alberta Energy’sreview can commence. In addition, ensure youhave the rights to drill and produce.The proposal and data can be submitted toEnergyUnitsHelpdesk@gov.ab.ca, in person,mailed, or couriered. The hard copy of all data ora memory stick must be submitted prior toCrown execution. Each PAUA requires a copy ofthe data or a memory stick.Note: When a well is placed on production andrequires a PAUA, the proposed Unit Operator maysend an email to EnergyUnitsHelpdesk@gov.ab.caand request an interim Crown/Freehold split. Thisrequest must be received the month the well isplaced on production and contain the proposedPAUA and data. Late or incomplete requests will notbe considered. 2018 Government of Alberta Updated: July 12, 2022 Pages 4 of 11Classification: PublicApprovals are subject to a review of any outstandingdebts with Alberta Energy. If approved, a minimumof 50% Crown allocation will be applied and theinterim allocation will be effective for up to one year.The interim allocation will be replaced with the finaltract allocations as executed in the PAUA. If theagreement is not fully executed within one year fromthe production date, the deparment will revert theallocation to the single well production entity’sbottom hole location.If the PAUA has a producing well and one or moreparties refuse to execute, the following areconsequences: Failure to execute a PAUA may result in theCrown taking action through the AER toremedy this high risk non-compliance underDirective 65 of the Oil and Gas ConservationRules. These specify that no well shall beproduced unless there is commonownership throughout the drilling spacingunit.OR Alberta Energy will recommend pluggingback the wellbore to ensure production isisolated to one drilling spacing uniteliminating the requirement for a PAUA.Commercial Gas StorageAn agreement that establishes a reservoir as one inwhich natural gas may be stored after it wasproduced from its native reservoir.ProposalTo convert a partially depleted reservoir into acommercial gas storage field and if some or all of thereservoir is on Crown land, a company must form aCommercial Gas Storage Unit Agreement bysubmitting a Commercial Gas Storage UnitAgreement proposal. (Information Letter 1998-23has additional information).
The model for this agreement is on AlbertaOnline Learning under Models for UnitAgreements. The agreements that are subject to aCommercial Gas Storage Unit Agreementare administered in accordance with thePNG Tenure Regulation. WIOs holding Crown petroleum and naturalgas agreements containing the unitizedzone would be a party to a Commercial GasStorage Unit Agreement. Mineral owners,including the Crown would also be parties tothe Agreement.Required Technical Data proposed and detailed calculation of tractfactorstechnical information that explains:o the pool being unitized such as netpay and structure mapping, crosssections, engineering andgeophysical datao the extent of the poolo presence of a gas capo AER water flood application andproject area approvalThe data must include calculations aboutremaining recoverable gas so that AlbertaEnergy can generate an amortizationschedule.The treatment of native gas is outlined in the modelCommercial Gas Storage Unit Agreement.The Commercial Gas Storage Unit Agreementprovides for the payment of royalties on remainingrecoverable marketable gas in the reservoir over abase amortization period. When the volume of gashas been determined, 80% of this amount,described by the heat content, will be amortized overa negotiated period. This amount will be indicated inthe Commercial Gas Storage Unit Agreement, whichprovides the methodology for the payment ofroyalties. 2018 Government of Alberta Updated: July 12, 2022 Pages 5 of 11Classification: PublicThe Crown does not have any regulated buffer zoneprotection or specific rules around migration of gas.It is important for the operator to identify the limits ofthe gas reservoir prior to using it for storage.However, only lands the Crown considers as part ofthe commercial gas storage operation will beincluded in the Commercial Gas Storage UnitAgreement.A letter from the unit operator must be receivedprior to execution advising the field, poolnumber and injection facility number, which isrequired in order to set up the injection schemeID.Information pertaining to existing facilities such ascushion gas, areal extent, licences, capacity,operators, etc. is handled by the AER.Although Alberta Energy supports the storage of gasin Alberta, there is no published policy on thepromotion of gas storage in Alberta. Please refer toInformation Letter 1998-23 for further information.Salt Cavern for CommercialStorageThe following must be obtained to develop a saltcavern for commercial storage: A lease from the Crown for the right tocreate a cavern in the salt formation andstore specified materials. Approval/licence from the AER for theinjection well. Additionally, the AER mayalso approve a disposal well to dispose ofthe brine solution.To apply for the subsurface rights lease, use theSubsurface Reservoir Leasing form on the AlbertaOnline Learning under Mineral Direct Purchasetab/Forms. The applicant must specify the location,storage zone, and the substance that will be stored.
The application fee for the lease is 625.00 and theannual rental is 12.50 per hectare. The lease isissued pursuant to the Metallic and IndustrialMinerals Tenure Regulation.Once the above requirements have been obtained,submit a Commercial Gas Storage Unit Agreementproposal to the Crown. This proposal is reviewed onhow much (amortized) native gas is in the cavern sothat the Crown can receive its share.The AER has technical requirements for convertinga salt cavern from liquid storage to gas storage.Apply through the AER or email inquiries@aer.ca.The subsurface rights lease from the Crown willusually accommodate a substance change, if theapplicant presented this within the initial application.Note: Copies of existing Unit Agreements, PAUA’s,and Commercial Gas Storage Agreements, can beobtained by e-mailing the AER’s Order FulfillmentTeam at informationrequest@aer.ca. As the AERhas no tracking system for units, you must providethe AER with the unit name.Useful Links:Online Learning Course –Unit Agreement Exhibit AThis online learning course providesscreen captures from ETS for this process.ETS Apply for AccessIn order to do an e-submission of Exhibit Arevisions, you will need to have an ETSaccount.For reference, please view the ETS AccountSetup and Preferences module underAccounts in ETS in the Online Learningportal.To access ETS, you will need to apply foran account setup so that you can dobusiness electronically with AlbertaEnergy. Please contact Crown Land Dataat (780) 644-2300 or emailcrownlanddatasupport@gov.ab.caUnit Agreement ModelsContain downloadable PAUA andCommercial Gas Storage unit models.Model of standard Unit Agreement isavailable through the Petroleum JointVenture Association at (403) 244-4487 oremail pjva@pjva.ca 2018 Government of Alberta Updated: July 12, 2022 Pages 6 of 11Classification: Public
leased and committed to the unit, contrary toAlberta Energy's land tenure policies.Crown Involvement in UnitsAlberta Energy is the manager of Alberta'shydrocarbon resources. Its mandate, in part, is toencourage the exploration and development of thePetroleum and Natural Gas reserves of the provincein a manner that is consistent with the economic,environmental and employment interests of Alberta.When Alberta Energy enters into a unit agreementon behalf of the Province of Alberta, it is committingCrown lands to the unit for an unspecified period oftime and is agreeing to accept royalties on the basisof allocated, rather than actual, production. In a unit,which combines Crown and freehold interests, it istherefore, critical to verify that the Crown lands havebeen allocated tract participations, which reflect theCrown's share of the reserves. It is also important, inany unit, to ensure the agreement complies withland tenure legislation and policy. Ideally, the unit should cover an entire pool.Oil pools and their associated gas capsshould be jointly unitized. Where this is notpossible, Alberta Energy will try to ensurethat no "windows" are created within theunit, and that the owners of any adjacentlands, which could be adversely affected,are offered participation in the unit uponreasonable terms. In order for the unitizationto proceed without these lands, letters fromthese owners declining participation in theunit is normally required. The basis for determining tract factors,particularly in a unit containing both Crownand freehold lands, must be equitable andtechnically justifiable.There must be diversity of ownership, either at thelessee or at the lessor level, for a unit to beconsidered. If the Crown were the only lessor and allthe lands were held by one company (or group ofcompanies in the same proportional interests), a unitwould be rejected by Alberta Energy as beingunnecessary.Equitable tract factors are typically basedupon a combination of two or three factorssuch as hydrocarbon pore volume,remaining recoverable reserves andproductivity. A formula that heavily penalizesundrilled lands is not acceptable to AlbertaEnergy as a basis for tract participation.Alberta Energy’s Policies OnUnitizationLands undrilled at the time of the formationof the unit may be drilled later, but willalways retain a reduced tract factor.Alberta Energy enters into units on behalf of theProvince of Alberta, under the authority of the Minesand Minerals Act section 102(1). Alberta Energymust ensure a proposed unit is equitable and fair toall participants and that any lands not included in theunit are not adversely affected by the formation ofthe unit.Alberta Energy reviews a proposed unit agreementwith the following principles in mind: The Crown must consider all lands within aunit to be productive. Non-productive landsdilute either parties’ interest, and nonproductive Crown lands would remain 2018 Government of Alberta Updated: July 12, 2022 Pages 7 of 11Classification: PublicSurface area is also an unacceptable factorfor determining tract factors unless there isno valid technical basis.If the tract factors are determined to beinequitable in a unit that is 100 percentCrown land, Alberta Energy will inform theoperator but will not ask for any adjustment.The first principle, above, necessitates thatno lands be allocated a tract factor of zero.
The unit should be comprised of completespacing units for the unitized substance.Drilling a well on an incomplete spacing unit,either inside or outside the unit boundary,will necessitate a pooling agreementbetween the unit and the owner of the nonunitized portion of the spacing unit. When a unit contains oil, and a gas cap ispresent, gas spacing is not requiredthroughout the entire unit area; however, thedrilling spacing unit for gas is required wheregas cap is present and for any wells that willlater be used to blow down the gas cap. All Crown agreements to be included in theunit must contain the appropriate rights andbe in good standing. Leases should bemonitored while the unit negotiations areproceeding to ensure any expiries duringthat period are dealt with.Alberta Energy will NOT automaticallycontinue leases that are within a proposedunit.Unless agreements are proven productiveand the continuation is resolved,agreements that are subject to section 17 or18 of the PNG Tenure Regulations will notbe included in the unit.AER approvals and units are bothproduction entities for the purposes ofCrown royalty, and if they conflict, theroyalty calculations will have to be donemanually. Not only is this time consuming,but it will also disrupt the negotiated equityof the tract participations, since the landoutside the unit will be added in on an arealbasis.Required Technical Data Geological mapping of the pool,superimposed on the unit outline, togetherwith the parameters on which it was based.This should include structural mapping andnet pay and/or hydrocarbon pore volumemapping. Structural and/or stratigraphic cross-sectionsto support the mapping, showinggas/oil/water contacts, if possible. Detailed information on the method used tocalculate the tract factors. Tables, formulaeand calculations must be included, as wellas any background material (e.g. coreanalyses, flow tests) used to determinevalue, and explanations for any assumptionsmade and used in the process. Complete set of well data for anyconfidential wells: logs, drillstem tests,completion report, absolute open flow/flowtest/initial production (confidential data isNOT available to Alberta Energy through theAER). Copies of any applications made to theAER, and approvals granted by them forenhanced recovery schemes, gas cyclingschemes, gas storage schemes or any otheroperation to be conducted by the unit.Initial term licences cannot be included in aunit agreement; however, intermediate termlicences can be included. If the unit is being formed to implement awaterflood, gas cycling scheme, gas storagescheme or any other enhanced recoveryproject that requires approval from the AER,the unit must contain all of the landsincluded in the approval. 2018 Government of Alberta Updated: July 12, 2022 Pages 8 of 11Classification: Public
Pressure surveys, material balancecalculations, and any other reservoirinformation that supports the size andcontinuity of the reservoir, or the productivityof the unit lands.It could also involve a horizontal oil well whoseproducing section crosses Crown and freeholdlands.Required Technical Data Seismic support (mapping and interpretedlines), if applicable. All relevant lines thatsupport the mapping should be included, notjust one or two examples. Seismic should beaccompanied by synthetic seismic logs. Written confirmation from any owners oflands with mapped pay not included in theunit (e.g. windows, peripheral tracts)indicating they do not wish to commit theirlands to the unit.The Exhibit "C" should be a clear copy of thewell log, properly labelled, with the top andbottom of the unitized interval marked byhorizontal lines on the logs.Note: All data submitted to Alberta Energy isretained in our files, with the exception of seismiclines, which can be returned upon request by theapplicant. All data is kept strictly confidential and isnot released or made available to anyone other thanthe party that submitted it.Production Allocation UnitAgreementsThe PAUA is a cross between a pooling agreementand a unit that has been developed for use wherevaried "Royalty and Working Interest Owners" wishto share the production from a single well.The well may be an off-target gas well that will drainan entire pool underlying portions of two or moredrilling spacing units. The AER will no longer grantan enlarged gas drilling spacing unit, but willapprove a holding provided that the ownership iscommon at both the lessee and lessor levels. 2018 Government of Alberta Updated: July 12, 2022 Pages 9 of 11Classification: Public Wellsite survey to confirm the surface holecoordinatesDirectional surveys for each drilled leg tocalculate open hole lengths on each tractDaily drilling reports to confirm casing pointsand kick off points for each legPlan view of the drilled legs to determinewhich drilling spacing units have beenpenetrated and should be included in thePAUAGeologic strip logs and electric logsCompletion reportsAlberta Energy is not empowered to sign poolingagreements, and the PAUA is the only vehicle, shortof a unit agreement, that will achieve commonroyalty ownership.The agreement provides for the sharing of costs,revenues and royalties on the basis of allocatedproduction and, if possible, the tract participationsare based on technical parameters rather than onsurface area. Offset obligations are eliminated andleases are continued for as long as the wellproduces.The agreement becomes effective at 0800 on thefirst day of the first calendar month which is theearliest of: the month in which production of productionallocation substances from the wellcommences, or the month following the date of executionand delivery of the agreement by the ownersof one hundred percent (100%) of theWorking Interest and one hundred percent(100%) of the Royalty Interest within theproduction allocation area.
Typically, these agreements terminate when asecond producing well is drilled within the PAUA. Inthis scenario, transitioning to a unit agreement maybe necessary to maintain common royaltyownership.The basis for determining tract participations mustbe equitable and technically justifiable. In the case ofstimulated horizontal wells with production casing inplace, the productive portion of the wellbore isconsidered to be from the last frac port to total depth(“TD”) of the wellbore. With a non-stimulated lateralwith an open-hole, the productive interval would befrom below the intermediate casing point (“ICP”) toTD of the wellbore. For non-stimulated multi-lateralwells, the common or primary leg portion of thewellbore is accounted for once in the calculations.The productive interval for the remaining legs is fromthe start of the sidetrack to TD of the wellbore. Othermethodologies for calculating tracts, such asacreage or mapped hydrocarbon pore volume, canbe used under special circumstances. Whencalculating tract factors, generally, the roadallowance portion is removed from the productiveinterval of the wellbore for both Crown and Freeholdtract.Note: Initial term licenses can be included in aPAUA.The Review ProcessThe length of time required by Alberta Energy toreview a unit proposal can vary greatly, dependingon the complexity and completeness of the datapresented, and the current workload of the variousgroups whose input is required.The following guidelines will help Alberta Energyreview your unit proposal as quickly as possible:1. Once the "Working Interest Owners" haveagreed on a unit outline, Alberta Energy canadvise whether the outline is acceptable.This will allow unit negotiations to proceedwith a greater degree of confidence. 2018 Government of Alberta Updated: July 12, 2022 Pages 10 of 11Classification: Public2. Once the "Working Interest Owners" haveagreed on the tract participation calculationparameters, Alberta Energy can advisewhether they are acceptable.3. Include all relevant data with your proposal.Alberta Energy will analyze this unit just ascarefully as would any prospective "WorkingInterest Owner", and will require just asmuch technical information.4. Point out any unusual characteristics of theunit and provide an explanation for anydecisions made.5. Avoid sending Alberta Energy "committeemapping" that is inconsistent with previouslysubmitted data used for other applications(e.g. lease continuation) by individualcompanies.
Description of UnitTerminologiesUnit AgreementWorking InterestAn agreement amongst the working interest ownersand royalty owners in an oil and/or gas pool for theco-operative operation of the pool from multiplewells.A right to produce and dispose of minerals,associated with the responsibility for the costs ofproduction and disposal.Production Allocation Unit Agreement (PAUA)Formed to allow WIO and royalty owners to share inthe production from a single well drilled through twospacing units of Crown and Freehold interests.Commercial Gas Storage Unit AgreementAn agreement that establishes a reservoir as one inwhich natural gas may be stored after it wasproduced from its native reservoir.Royalty InterestAn ownership interest in mineral rights.Royalty OwnerAn individual or corporation who owns a royaltyinterest. A royalty owner (lessor) who leases out hisrights to a working interest owner is usually entitledto share of the production obtained from the rights.Note: The Crown participates in units only as amineral rights (royalty) owner. Alberta Energy onlybecomes involved in units that contain Crown rights.Unit OperatorThe party designated by the working interest ownersin a unit agreement as the operator of the unit.UnitizedUsed to refer to a zone or a spacing unit that issubject to a unit agreement. 2018 Government of Alberta Updated: July 12, 2022 Pages 11 of 11Classification: PublicA working interest is usually acquired from theroyalty owner of the mineral rights through a leasingarrangement.Working Interest Owner (WIO)An individual or corporation who owns a workinginterest.Each WIO (lessee in a unit agreement) contributesto the unit costs in proportion to this tractparticipation factor and receives production orrevenues in the same proportion, whether or notthere is a well physically located on the agreement.
convention as long as the numbering system is consistent and in sequential numbering after the change. For example, from a revision number to a date Revision no. 01, was changed later to a date 2018-01. The next revision number would then be 2018-02, then 2018-03, etc. The revisions submitted to Alberta Energy must be in chronological order.
