Energy Coordination (Gas Tariffs) Regulations 2000

The Regulations turn on a small set of tightly defined concepts. These concepts determine who must provide capped tariffs, what a capped tariff is, how tariffs are to be calculated, and how they move over time.

• Areas to which the Regulations apply (regulation 3 and regulation 4(1)). The Regulations apply only to the supply of gas in three named categories: the Mid‑West/South‑West area, the Albany area and the Kalgoorlie‑Boulder area (regulation 3). Each area is defined by reference to distribution licences that were granted to the Gas Corporation and the local government districts and the licence boundaries as they applied when first granted (regulation 4(1): definitions of Albany area, Kalgoorlie‑Boulder area, Mid‑West/South‑West area). The spatial boundary is therefore frozen to licence application at grant date rather than being a fluid geographic definition.

• Supplier (regulation 4(1)). “Supplier” is defined as the holder of a trading licence. The obligation to have and offer capped tariffs attaches to that person. The definition signals that trading‑licenced market participants (not, for example, transport or distribution licence holders per se) are the regulated subject of these Regulations.

• Capped tariff (regulation 4(1), regulation 5(2)). A capped tariff is a tariff where the charge for a supply in any charge period cannot exceed the charge that would be calculated and, if applicable, adjusted under Schedule 1. Regulation 5(1) requires a supplier intending to supply gas in a listed area to have at least one capped tariff for supply in that area. The Schedule therefore functions as a ceiling template against which a supplier’s capped tariff must be measured.

• Small‑use, residential supply and standard contracts (regulation 4(2) and regulation 6). The Regulations distinguish residential supply (supply to a dwelling or separately metered premises where the gas is solely for residential use , regulation 4(2)) from non‑residential supply. Regulation 6 directs that suppliers must offer their existing “standard contract” customers capped tariffs unless those contracts already entitle the customer to capped tariffs; it also requires that suppliers offering standard form contracts to new small‑use customers must offer a capped tariff (regulation 6(2), (4)). “Standard form contract” is referenced to section 11WB of the Energy Coordination Act 1994 (regulation 6(5)), so the concept and its legal contours are supplied by the Act, not by these Regulations.

• Tariff structure (Schedule 1 Parts 1-3). The Schedule sets out componentised tariff formulas. For example, the Mid‑West/South‑West residential tariff (Schedule 1 cl. 1) consists of a fixed component (21.98 cents per day) and three usage components (first band at 15.18 cents/unit for first L units, second at 13.69 cents/unit for next M units, third at 13.69 cents/unit thereafter), with L and M defined by formulas using N (days in the billing period) and, for commonly metered multiple dwellings, a factor F (number of dwellings). Other areas have different fixed and usage rates and band structures (Schedule 1 cll 2-6).

• Rounding and calculation rules (regulation 7). Calculation precision is regulated: rates expressed in cents per unit or cents per day are to be rounded to the nearest one hundredth of one cent (with ties going to the nearest even one hundredth), and charges that are not whole multiples of five cents are rounded to the nearest whole number multiple of five cents (with ties going to the nearest even multiple of five cents). These rules govern both intermediate and final numeric presentation (regulation 7(1) and (2)).

• CPI adjustment mechanism (Schedule 1 Part 4, cll 7-9). From the 2021/22 financial year the Schedule provides an annual mechanism to increase (but not automatically decrease) tariff component rates where the Australian Statistician’s All Groups CPI for the specified quarter rises relative to the prior year’s corresponding quarter (Schedule 1 cl. 8). There is a specialised adjustment rule for the third usage component of the Mid‑West/South‑West residential tariff that incorporates a 2% decline floor test (Schedule 1 cl. 9).

These are the Regulations’ core operational concepts; every supplier duty and customer right in the text is a mechanical application of these definitions and formulas.

The Regulations impose obligations and set entitlements that affect distinct groups of actors. The direct statutory subjects and primary stakeholders are suppliers, small‑use customers (particularly those on standard contracts), and the Gas Corporation in relation to the licenced areas. Secondary stakeholders include meter owners and billing administrators who implement the calculation and rounding rules, and regulators or coordinators who may be called on for index data or to interpret undefined terms.

• Suppliers (regulation 4(1); regulation 5(1)). The statutory duty is placed on “supplier” defined as the holder of a trading licence. Any trading licence holder who intends to supply gas in the Mid‑West/South‑West, Albany or Kalgoorlie‑Boulder areas must ensure at least one capped tariff exists for any supply in that area (regulation 5). Suppliers therefore must design at least one tariff that does not exceed the Schedule 1 ceiling and must maintain records and billing systems capable of implementing the Schedule’s componentisation and rounding methods (regulation 7 and Schedule 1).

• Small‑use customers, existing standard contract customers and new customers offered standard form contracts (regulation 6). The Regulations aim particular protections at “existing standard contract customers” (regulation 6(2) and (3)) and “new customers” to whom a supplier offers supply under a standard form contract (regulation 6(4)). An “existing standard contract customer” is defined in regulation 6(3) as a small use customer who, under s 25(1) of the Gas Corporation (Business Disposal) Act 1999, is to be regarded as having entered into a contract. The effect is that small‑use residential or separately metered customers on relevant standard contracts are to be offered capped tariff terms. The text does not define “small use customer” in these Regulations; the term is used and must be located in source law elsewhere (for example, the Act or other Regulations), or be interpreted in operational practice.

• Customers in multiple‑dwelling, commonly metered premises (Schedule 1 cl. 1(a)(b)). The Schedule distinguishes single‑dwelling separately metered supplies from multiple dwellings served through a common meter, and it adjusts the L and M band thresholds in the Mid‑West/South‑West residential tariff formula to account for F, the number of dwellings. Operators serving multi‑unit premises therefore must apply different band thresholds when billing against the capped tariff.

• Gas Corporation and licence holders. The area definitions rely on distribution licences that were granted to the Gas Corporation; the Regulations thus map onto pre‑existing licence geographies and, in that sense, affect the Gas Corporation’s historical license footprint (regulation 4(1) definitions).

• Billing processors, accountants and auditors. Because the Schedule sets explicit cents‑per‑day and cents‑per‑unit rates, and because rounding rules are prescriptive (regulation 7), backend billing and accounting systems must be able to implement the precise arithmetic and rounding conventions for compliance and for audit trails.

• Regulators and the Coordinator (Schedule 1 cl. 7(b) contingency). Schedule 1 cl. 7 allows, if the ABS CPI series is not available, for a corresponding index number to be published by “a person appointed by the Coordinator”. That provision anticipates an administrative role for the Coordinator to appoint an alternative index publisher, which may engage regulatory discretion in exceptional circumstances.

The Regulations do not, within their text, impose duties on distributors, transporters, or other energy market participants unless they are also trading licence holders supplying gas. They also do not themselves create licensing conditions or penalties; those matters sit in the Act and other legislation referenced by the Regulations.

This section lists the concrete obligations a supplier must meet and the express entitlements or options afforded to customers by the Regulations, with statutory references.

Supplier duties

• Maintain at least one capped tariff for each area where the supplier intends to supply gas (regulation 5(1)). The supplier must ensure a tariff exists such that charges under it do not exceed Schedule 1 (regulation 5(2) defines “capped tariff”).

• Offer capped tariffs to specified small‑use customers (regulation 6). For existing “standard contract customers” of a supplier, the supplier must offer supply under the terms of the customer’s existing contract but at a capped tariff unless the existing contract already allowed capped tariffs (regulation 6(2)). For new customers to whom a supplier offers supply under a standard form contract, the supplier must offer supply at a capped tariff (regulation 6(4)). These obligations operate as offers a supplier must make; regulation 6(6) expressly permits the supplier and customer to agree alternative charges or terms, so the statutory duty is an offer requirement rather than an absolute prohibition on different contractual terms.

• Calculate charges in accordance with Schedule 1 when the capped tariff applies (Schedule 1 Parts 1-3). The Schedule prescribes fixed components (daily cents) and usage components (cents per unit), including banding rules for some tariffs such as the Mid‑West/South‑West residential tariff (Schedule 1 cl. 1). The supplier must apply the definitions for L, M and N (band thresholds tied to billing period days and number of dwellings, Schedule 1 cl. 1).

• Apply rounding rules in regulation 7. When calculating amounts derived from cents per unit or cents per day, round to the nearest 0.01 cent (with even‑tie rule); and round final charges to the nearest 5‑cent multiple (with even‑tie rule) (regulation 7(1)-(2)).

• Implement CPI adjustments where applicable for the 2021/22 financial year and later (Schedule 1 cl. 8) and the special adjustment test for the Mid‑West/South‑West third usage component (Schedule 1 cl. 9).

Customer rights and options

• Entitlement to be offered capped tariff terms for existing standard contract customers and new customers offered standard form contracts (regulation 6(2), (4)). Customers in those categories must be offered capped tariff supply; that is the statutory entitlement.

• Ability to contract outside the capped tariff. Regulation 6(6) allows a supplier and customer to agree to different charges or terms despite the statutory offer requirement. Practically, the customer has the right to accept the capped offer or to negotiate alternative terms.

Prescriptive calculation detail

• The Schedule sets explicit numeric rates. Examples: Mid‑West/South‑West residential fixed component 21.98 cents/day; Albany residential fixed component 23.73 cents/day (Schedule 1 cll 1, 3). Kalgoorlie‑Boulder residential fixed component 49.43 cents/day (Schedule 1 cl. 5). Non‑residential rates vary likewise (Schedule 1 cll 2, 4, 6). Suppliers must implement these numerical caps unless they adjust within permitted CPI rules (Schedule 1 cl. 8-9).

Administrative references

• Commencement of the Regulations is tied to the Gas Corporation (Business Disposal) Act 1999 s 25(3) (regulation 2). “Existing standard contract customer” is defined by reference to s 25(1) of the Gas Corporation (Business Disposal) Act 1999 (regulation 6(3)). “Standard form contract” is defined by reference to section 11WB of the Energy Coordination Act 1994 (regulation 6(5)). These cross‑references shape who qualifies for the offer duties.

Limits in the text

• No penalty or enforcement machinery appears in the Regulations themselves. The Regulations set duties and calculative rules but do not include express sanction clauses within their own text. Enforcement therefore must rely on the enforcement regime in the underlying Act or other statutes, or on regulatory/licence conditions not contained in these Regulations.

The Regulations themselves do not contain express penalty clauses, infringement fees, or a specified administrative enforcement pathway. The textual content focuses on duties, formulae, definitions and calculation mechanics; it does not provide for civil penalties, criminal offences, infringement notices, or an administrative enforcement timetable within the instrument. That absence is material for compliance planning: any consequence for failing to have a capped tariff, failing to make the offers required by regulation 6, or failing to calculate in accordance with Schedule 1 will be derived from other legal instruments rather than imposed directly by these Regulations.

Where enforcement might arise

• Enforcement must be sought in or will be administered under the broader legislative architecture referenced by the Regulations. The Regulations cite the Energy Coordination Act 1994 (the Act) and the Gas Corporation (Business Disposal) Act 1999 for definitional and commencement purposes (see regulation 2, regulation 6(5), and regulation 6(3)). Those statutes, or the licence conditions issued under them, are the likely instruments to provide specific sanctioning powers, compliance directions, or dispute resolution mechanisms. The Regulations do not specify those provisions; a reader must consult the Act, licence instruments and the Gas Corporation (Business Disposal) Act 1999 for enforcement detail.

• Administrative agencies and licence conditions. The Regulations identify the regulated subject as the holder of a trading licence (regulation 4(1): “supplier”), which suggests that the licensing authority and relevant energy market regulator supervising trading licences would be the authorities through which compliance is monitored and enforced. However, the Regulations do not name the regulator or provide a statutory process for investigations, notices, or penalty imposition.

Implications of no penalty text

• If a supplier fails to implement a capped tariff, fails to make the offers required by regulation 6, or miscalculates tariffs inconsistent with Schedule 1 and the rounding rules in regulation 7, the Regulations themselves provide no standalone statutory penalty. The practical enforcement path would be (1) regulatory action under licence conditions, if those conditions incorporate the Regulations; (2) statutory action under provisions of the Energy Coordination Act 1994 or the Gas Corporation (Business Disposal) Act 1999 that enable penalties or compliance orders; or (3) private contractual or consumer enforcement routes where customers seek remedies if contractual terms purporting to comply with the Regulations are breached.

• Note on interpretive disputes. The Regulations give precise mathematical rules (Schedule 1 and regulation 7). Disputes about implementation (for example how to compute L and M for commonly metered premises under Schedule 1 cl. 1(b)) would be matters of statutory construction and factual spreadsheet work. Remedies and adjudication in such disputes are not provided in the Regulations; the enforcement forum would be located in the Act or regulatory/licence mechanisms.

In short, the Regulations set duties and numeric ceilings but are silent on direct sanctions. Compliance and enforcement consequences must be sourced from the Act, licence conditions and other laws or administrative practices that govern trading licence holders and gas supply in Western Australia.

The Regulations operate as a subordinate instrument within a broader statutory framework and expressly cross‑refer to other Acts and provisions. The textual cross‑references define who is covered, when the Regulations commence, and where interpretive authority for some terms resides.

Key statutory cross‑references in the Regulations

• Energy Coordination Act 1994 (the Act). The Regulations appear under the Act’s umbrella (the heading at the top names the Act). Regulation 6(5) expressly imports the meaning of “standard form contract” from section 11WB of the Act. That cross‑reference means the definition and legal consequences of entering into a standard form contract are governed by the Act; the Regulations assume the Act’s definitional framework for the scope of the offer obligations in regulation 6.

• Gas Corporation (Business Disposal) Act 1999. The Regulations’ commencement is linked to a relevant day defined in section 25(3) of the Gas Corporation (Business Disposal) Act 1999 (regulation 2). Regulation 6(3) uses the term “existing standard contract customer” and defines it by reference to customers who, under section 25(1) of the Gas Corporation (Business Disposal) Act 1999, are to be regarded as having entered into a contract. Thus the effect and timing of obligations to offer capped tariffs to “existing” customers depends on the application of s 25(1) of that Act.

• Trading and distribution licences. The Regulations define areas by reference to distribution licences that were granted to the Gas Corporation and that applied when first granted (regulation 4(1)). “Supplier” is defined as holder of a trading licence (regulation 4(1)). Those definitions embed the Regulations within the licensing regime: the spatial scope tracks licence boundaries and the regulated subject is a trading licence holder. Licence instruments and their conditions may therefore operationally incorporate, enforce or amplify the Regulations’ duties.

• Consumer Price Index (Schedule 1 cl. 7). The CPI adjustment mechanism in Schedule 1 uses the Australian Statistician’s Consumer Price Index, All Groups, weighted average for eight capital cities (Schedule 1 cl. 7(a)). If that ABS series is not available, Schedule 1 cl. 7(b) contemplates a corresponding index published by a person appointed by the Coordinator. That cross‑reference brings the ABS’s statistical product into the legal computation of tariff changes and provides a contingency role for the Coordinator to appoint an alternative publisher.

Areas of interpretive dependence and possible cross‑statute issues

• Undefined or externally defined terms. “Small use customer” is used in regulation 6 but not defined in the Regulations. The missing definition means the term’s legal scope is determined outside these Regulations , likely in the Act or in licence instruments. Practitioners must therefore consult the Act and relevant licensing documents to determine which customers qualify for the protections and offers in regulation 6.

• Interaction with contract law and statutory consumer protections. Regulation 6(6) allows supplier and customer to agree different charges and terms to those required to be offered. That provision creates a contractual space: customers and suppliers can contract out of capped tariff terms by mutual agreement. The practical interplay between contract law, the Act’s consumer protections (which may contain implied terms or prohibited unfair terms), and these Regulations will determine whether an agreed alternative is enforceable and how disputes are resolved. Those matters are governed by the Act and general contract law, not by the Regulations themselves.

• Licence enforcement. Because the obligations attach to trading licence holders, enforcement may be effected by regulatory action for licence breaches. Licence conditions or the regulator’s enforcement powers under the Act may prescribe sanctions, remediation, or directions that the Regulations do not. Practitioners must cross‑check trading licence terms and the Act for enforcement detail.

In sum, the Regulations specify tariffs and offer duties but rely on the Act, the Gas Corporation (Business Disposal) Act 1999, distribution and trading licence instruments, and ABS statistics for definitions, commencement timing, enforcement, and indexation. Compliance assessments therefore require coordinated analysis of these connected instruments.

The Regulations include a compilation table and amendment notes within the text. The legislative history set out in the instrument identifies successive amendment instruments and reprints, with dates of publication and commencement. The Schedule also records amendment footnotes at the clauses where numeric rates were changed.

Timeline and instruments (as recorded in the compilation table)

• Original Regulations: Energy Coordination (Gas Tariffs) Regulations 2000 , published 28 June 2000; commenced 2 July 2000 (see regulation 2 and Gazette 28 June 2000 p. 3285).

• Amendments and reprints:

  • 2002: Energy Coordination (Gas Tariffs) Amendment Regulations 2002 (published 18 October 2002; commenced 18 October 2002). The 2002 instrument also inserted Part 4 (adjustment clauses) and the CPI framework (Schedule 1 cl. 7 onward) as shown in the Schedule annotation against clauses 7-9.
  • 2008: Amendment Regulations 2008 (published 30 June 2008; commenced 1 July 2008). Several Schedule clauses note amendments with Gazettal references.
  • 2009: Amendment Regulations 2009 (published 30 June 2009; parts commenced 30 June 2009 and others from 1 July 2009).
  • 2010: Amendment Regulations 2010 (published 26 March 2010; parts commenced 26 March 2010 and most on 1 April 2010).
  • 2011: Amendment Regulations 2011 (published 29 July 2011; parts commenced 29 July 2011 and other parts 1 August 2011).
  • 2012 (two instruments): Amendment Regulations (No. 2) 2012 (published 1 May 2012; commenced 1 May 2012) and Amendment Regulations 2012 (published 24 July 2012; parts commenced 24 July 2012 and other parts from 25 July 2012). The Gazette references show some heading deletions and definitional updates in regulation 4 and elsewhere.
  • 2013: Amendment Regulations 2013 (published 17 May 2013; parts commenced 17 May 2013 and other parts 21 May 2013).
  • 2020: Energy Coordination (Gas Tariffs) Amendment Regulations 2020, SL 2020/80 (published 12 June 2020; parts commenced 12 June 2020 and other parts on 1 July 2020). Several Schedule clauses carry an SL 2020/80 r. 4(3) annotation indicating amendments to numeric rates or adjustment provisions.

• Reprints: Reprint 1 (as at 18 Sep 2009) and Reprint 2 (as at 4 Apr 2014) are recorded in the compilation table, indicating consolidation points.

Notable amendments in the text

• Schedule numeric rates and clause annotations. Each Schedule clause carries an “amended” footnote listing the Gazette items that altered the clause. For example, Schedule 1 cl. 1 (Mid‑West/South‑West residential tariff) shows multiple amendment citations including Gazette dates in 2002, 2008, 2009, 2010, 2011, 2012, 2013 and the 2020 SL 2020/80. These footnotes demonstrate periodic numeric adjustments to fixed and usage components and to banding definitions.

• Insertion of Part 4 (adjustment of certain tariff caps) and CPI framework. The Schedule shows that clauses 7-9 (the CPI number definition and the general and special adjustments for 2021/22 and subsequent financial years) were inserted by the 2002 amendment (Gazette 18 Oct 2002 p. 5225), and thereafter have been amended periodically. The Schedule’s reference to the 2021/22 financial year in cll 8 and 9 suggests that the CPI adjustment mechanism applies from that financial year onward.

• Deleted provisions. The text notes that regulation 8 was deleted (Gazette 30 Jun 2008 p. 3133). The compilation table records the sequence of amendments that have pruned or revised regulation numbering and headings.

Practical consequence of the amendment history

• Numeric rates have been periodically altered by amending regulations rather than by administrative statements. The Schedule carries historical amendment footnotes for each clause, so practitioners must check for the latest consolidated reprint or the current version of the Regulations to obtain up‑to‑date rates and to ensure the CPI adjustment formulae reflect the most recent legislative setting.

• The insertion and subsequent amendment of the CPI adjustment clauses show legislative intent to move from fixed nominal cents to an inflation‑linked regime from the 2021/22 financial year, with a special rule for one usage band in the Mid‑West/South‑West area.

To verify the current operative text and numeric rates for compliance or advice, practitioners should consult the most recent consolidated reprint or the WA Government Gazette entries cited; the compilation table in the Regulations provides the necessary references for that tracking.

The Regulations themselves do not include case law, and the instrument contains no annotated judicial decisions. The text supplied does not name any court decisions, appeals or tribunal determinations that interpret these Regulations. Consequently, from the Regulations’ text alone there is no internal litigation history to report.

What the absence of cases in the text means in practice

• No statutory compilation note claims judicial interpretation. The compilation and amendment history in the Schedule records only legislative amendments and reprints. The absence of recorded cases within the Regulations does not mean disputes have not arisen in practice; it means the Regulations’ text and compilation notes do not catalogue or reproduce judicial decisions.

• Points of potential litigation (for practitioners to consider, based on statutory content). While not a record of litigation, the Regulations present interpretive points that could give rise to disputes if parties contest implementation:

  • Definition scope: “small use customer” is used in regulation 6 but not defined in these Regulations. Disputes could arise over whether particular customers fall within that undefined term; resolution would require reference to the Act or other instruments.
  • Application of band thresholds for commonly metered multi‑dwelling supplies (Schedule 1 cl. 1(b)). Determining F (number of dwellings) and the correct computation of L and M for variable billing periods could produce factual and interpretive disagreements.
  • Rounding rules and billing outcomes (regulation 7). The Regulations prescribe tie‑breaking rounding conventions (to the nearest even cent increment in ties). This level of numeric specificity can produce disputes about implementation in legacy billing systems or about back‑billing corrections.
  • CPI adjustment formulae and their triggering conditions (Schedule 1 cll 8-9). The special 2% decline test for the third usage component in the Mid‑West/South‑West area could produce litigation if parties disagree on the correct CPI series, the relevant quarter, or the calculation of Rn based on previous rates.
  • Interaction with standard form contracts and contract variation (regulation 6(6)). If a supplier and customer agree different charges from the capped offer, disputes might concern whether the agreement is valid, enforceable, or conflicts with other statutory consumer protections in the Act.

Where to find litigation relating to these Regulations

• To locate case law, practitioners must search judicial decisions, tribunal records and regulatory determinations outside the Regulations text, and cross‑reference the Energy Coordination Act 1994, licence conditions and consumer protection statutes that could have been the source of enforcement actions or disputes. The Regulations do not provide a litigation register or footnotes citing relevant authorities.

In summary, the Regulations do not contain a litigation history in their text. Any analysis of judicial interpretation or precedent will require independent legal research in courts and tribunals and examination of how enforcement authorities and contract parties have applied the Regulations in concrete disputes.

The Regulations contain a number of technical features and drafting choices that can produce compliance traps or operational surprises. Below are specific, source‑grounded items to watch, with the exact statutory references that create the risks.

1. Geographic fixity of area definitions (regulation 4(1) and regulation 3). Each area is defined in reference to distribution licences “as they applied when first granted” (regulation 4(1) definitions of Albany area, Kalgoorlie‑Boulder area, Mid‑West/South‑West area). That means changes to licence boundaries after the grant date do not automatically alter the Regulations’ spatial scope. A supplier operating at a boundary or after licence rearrangements must check historic licence maps rather than rely on current distribution configurations.

2. “Small use customer” is used but not defined in these Regulations (regulation 6). The absence forces suppliers and advisers to check the Energy Coordination Act 1994, the Gas Corporation (Business Disposal) Act 1999, or licence instruments for the operative definition. Misidentifying a customer as a small use customer (or failing to identify one) can lead to incorrect offers.

3. Offer duty, not an in‑extremis pricing restriction (regulation 6(6)). Regulation 6(2) and (4) impose a duty to offer capped tariffs; regulation 6(6) allows supplier and customer to agree different charges. The legislative design makes the capped tariff an offer entitlement rather than an absolute contractual ceiling that cannot be contracted away. Parties negotiating bespoke terms can therefore lawfully agree alternatives, provided there are no contrary provisions in other statutes or licence conditions. Practitioners should not assume cap availability eliminates bargaining outcomes.

4. Complex band calculation for multiple dwellings (Schedule 1 cl. 1). For multiple dwellings supplied through a commonly metered supply point the L and M thresholds become [12 × N] + [(F‑1) × 5] and [24 × N] + [(F‑1) × 5] respectively, where F is the number of dwellings and N is days in the billing period. That arithmetic is easily misapplied when billing periods vary or when the number of dwellings changes within a billing period. Errors here affect whether usage falls into the first, second, or third bands.

5. Rounding tie‑breaking rules (regulation 7). Regulation 7(1) requires rounding to the nearest one hundredth of one cent with ties rounded to the nearest even one hundredth. Regulation 7(2) requires final charges be rounded to the nearest 5‑cent multiple with ties rounded to the nearest even multiple. These are not standard commercial rounding rules; legacy billing systems and manual calculations may produce systematic rounding variances. Suppliers should ensure their systems implement the even‑tie rule precisely.

6. CPI‑linked adjustments only when CPI rises (Schedule 1 cl. 8(2) and cl. 9(2)). The general adjustment formula (cl. 8) applies only if CPI for the relevant quarter is greater than the prior year’s quarter (CPIr > CPIr‑1); otherwise the cents per unit or day remain at the prior year’s level (cl. 8(3)). The special rule for the Mid‑West/South‑West third usage component includes a 2% decline test (cl. 9). Practically, rates will not be automatically reduced by CPI declines except as specified in cl. 9’s text, potentially creating asymmetric upward movement but protected floors. This asymmetry will matter in forecasting tariff evolution and customer notices.

7. CPI data source and contingency (Schedule 1 cl. 7). The CPI number is specified as ABS All Groups index for eight capital cities. If that series is unavailable, a “person appointed by the Coordinator” can publish a corresponding index (cl. 7(b)). The fallback creates an operational dependency on an administrative appointment; suppliers should track whether and when such a contingency might be triggered and which appointed publisher would provide the series.

8. No penalty provisions in the Regulations (see Penalties and enforcement section). There is no standalone enforcement or penalty clause in the Regulations. Suppliers cannot rely on a fines schedule contained in the Regulations; enforcement must be located in the Act or licence conditions. Misreading this could lead to underestimating regulatory exposure or the need to coordinate with licencing authorities.

9. Multiple amendment footnotes imply frequent numerical updates (Schedule 1 clause annotations). Practitioners should not rely on historic printed copies of the Schedule; they must consult the current consolidated version because the fixed daily and unit rates have been amended repeatedly and are not static.

10. Commencement linkage to another Act (regulation 2). The Regulations come into operation “on the relevant day as defined in section 25(3) of the Gas Corporation (Business Disposal) Act 1999” (regulation 2). That linkage means commencement may hinge on the operation of the referenced Act; practical staging of compliance should recognise that commencement mechanics are external to the Regulations themselves.

These are concrete operational “gotchas” grounded in the Regulations’ text. Addressing them requires administrative attention to billing systems, careful definition cross‑checking against the Act and licence instruments, and procedural coordination with regulatory and statistical data sources.

This compliance checklist reflects the Regulations’ operative requirements and calculation mechanics. It is structured as actionable steps a trading licence holder intending to supply gas in the named areas should follow, with statutory references for each step.

1. Confirm geographic applicability (regulation 3; regulation 4(1)). Determine whether your proposed supply points fall within the Mid‑West/South‑West, Albany or Kalgoorlie‑Boulder areas as defined in regulation 4(1). Use the distribution licence boundaries “as they applied when first granted” rather than relying on current distribution maps without cross‑checking licence grant records.

2. Identify your supplier status (regulation 4(1)). Verify that you are a holder of a trading licence. The obligations in regulation 5 and regulation 6 attach to the trading licence holder as the “supplier”.

3. Maintain at least one capped tariff per area of intended supply (regulation 5(1) and 5(2)). Design a tariff that does not exceed the Schedule 1 ceiling. The capped tariff may be identical to the Schedule calculation or be lower; it must not exceed the Schedule calculation as adjusted under Part 4 (Schedule 1 cll 7-9). Document the capped tariff and the methodology demonstrating that it does not exceed the Schedule.

4. Offer capped tariffs to eligible customers (regulation 6). For existing standard contract customers (as defined in regulation 6(3) by reference to s 25(1) of the Gas Corporation (Business Disposal) Act 1999), make an offer to supply on the terms of the existing contract but at a capped tariff unless the existing contract already provides for capped tariff supply (regulation 6(2)). For new customers offered a standard form contract (section 11WB of the Energy Coordination Act 1994 defines that term; regulation 6(5)), include an offer of supply at a capped tariff (regulation 6(4)). Keep records of these offers (dates, contract terms, customer responses).

5. Implement calculation and billing rules (Schedule 1 Parts 1-3; regulation 7). Configure billing systems to:

   • Apply the correct fixed and usage components for the applicable area and customer type (residential vs non‑residential) as per Schedule 1 cll 1-6.
   • For Mid‑West/South‑West residential customers, compute L and M using N (number of days in the billing period) and, where applicable, adjust for F (number of dwellings) under Schedule 1 cl. 1.
   • Apply rounding rules exactly: intermediate rates (cents per unit/day) rounded to the nearest 0.01 cent with ties going to the nearest even 0.01 cent (regulation 7(1)); final charges rounded to nearest 5‑cent multiple with ties to the nearest even multiple (regulation 7(2)). Validate billing software and spreadsheet formulas against test vectors, including tie scenarios.

6. Apply CPI adjustments where applicable (Schedule 1 cl. 8 and cl. 9). For the 2021/22 financial year and each subsequent financial year (the “relevant year”), compute CPIr = CPI for the quarter ending on the last 31 March before the relevant year begins, and CPIr‑1 = CPI for the quarter ending the prior year’s 31 March (Schedule 1 cl. 8(2)). If CPIr > CPIr‑1 apply the specified multiplicative adjustment formula to Rn‑1 to derive Rn (Schedule 1 cl. 8(2)). If CPIr ≤ CPIr‑1 keep Rn = Rn‑1 (cl. 8(3)). For the third usage component in Mid‑West/South‑West residential tariff apply cl. 9’s special rule with the 2% decline test (cl. 9(2)-(3)). Use the ABS All Groups CPI, weighted average for eight capital cities (Schedule 1 cl. 7(a)); if absent, obtain the alternative index published by a person appointed by the Coordinator (cl. 7(b)). Maintain CPI calculations and the data source record.

7. Distinguish residential from non‑residential supply (regulation 4(2)). Apply the residential tariff only where the supply is to a dwelling or to a separately metered place and is solely for residential use. For all other supplies use the relevant non‑residential tariff. Document the basis for your classification and meter arrangements.

8. Manage commonly metered multi‑dwelling supplies (Schedule 1 cl. 1(b)). If multiple dwellings are supplied through a commonly metered supply point, compute L and M using F, the number of dwellings, and include the reduced per‑dwelling fixed component per Schedule 1 cl. 3(b) where applicable (Albany area residential multiple dwelling fixed component splits). Keep records that justify the F value used for each billing period.

9. Record offers and any contract variations (regulation 6(6)). Although suppliers must offer capped tariffs, regulation 6(6) permits negotiated departures. If a customer accepts different terms document the agreement and ensure it is not inconsistent with other statutory protections. Retain audit trails showing that the capped tariff offer was made and the customer’s informed consent to any alternative.

10. Coordinate with licensing and enforcement authorities. While the Regulations do not specify penalties, ensure that trading licence conditions and regulator expectations are met. Confirm whether licence conditions incorporate the Regulations and whether the regulator requires separate reporting or notification. If in doubt, consult the licensing authority and legal counsel to ensure alignment across instruments.

11. Audit and testing. Periodically audit billing outputs to ensure Schedule 1 ceilings are not exceeded, CPI adjustments have been correctly applied, rounding rules are implemented, and offers have been made to the appropriate customer cohorts. Keep documentary evidence of the methods and data sources for CPI application, meter status (separately metered vs commonly metered), and dwelling counts used for multiple dwelling calculations.

Following these steps will align a supplier’s practical operations with the Regulations’ textual obligations. For ambiguous or borderline factual scenarios (for example, whether a customer qualifies as a small use customer), consult the Energy Coordination Act 1994, relevant licence documents and legal counsel to resolve definitional questions before acting.