DRAFT DECISION
TasNetworks distributiondetermination
2017−18 to 2018−19
Attachment 14–Control mechanisms
September 2016
© Commonwealth of Australia 2016
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Note
This attachment forms part of the AER's draft decision on TasNetworks' distribution determination for 2017–19. It should be read with all other parts of the draft decision.
The draft decision includes the following documents:
Overview
Attachment 1 – Annual revenue requirement
Attachment 2 – Regulatory asset base
Attachment 3 – Rate of return
Attachment 4 – Value of imputation credits
Attachment 5 – Regulatory depreciation
Attachment 6 – Capital expenditure
Attachment 7 – Operating expenditure
Attachment 8 – Corporate income tax
Attachment 9 – Efficiency benefit sharing scheme
Attachment 10 – Capital expenditure sharing scheme
Attachment 11 – Service target performance incentive scheme
Attachment 12 – Demand management incentive scheme
Attachment 13 – Classification of services
Attachment 14 – Control mechanisms
Attachment 15 – Pass through events
Attachment 16 – Alternative control services
Attachment 17 – Negotiated services framework and criteria
Attachment 18 – Connection policy
Attachment 19 – Tariff structure statement
1 Attachment 14 – Control mechanisms | TasNetworks distribution draft determination 2017–19
Contents
Note
Contents
Shortened forms
14Control mechanisms
14.1Draft decision
14.2TasNetworks' proposal
14.3Assessment approach
14.4Reasons for draft decision
14.4.1Application of the revenue cap
14.4.2Reporting on designated pricing proposal charges
14.4.3Reporting on jurisdictional scheme amounts
14.4.4Control mechanism formulas
ADUoS unders and overs account
BDesignated pricing proposal charges unders and overs account
CJurisdictional scheme amounts unders and overs account
DAssigning retail customers to tariff classes
D.1AER's assessment approach
D.2Reasons for the draft decision
D.3Procedures for assigning and reassigning retail customers to tariff classes
Shortened forms
Shortened form / Extended formAEMC / Australian Energy Market Commission
AEMO / Australian Energy Market Operator
AER / Australian Energy Regulator
augex / augmentation expenditure
capex / capital expenditure
CCP / Consumer Challenge Panel
CESS / capital expenditure sharing scheme
CPI / consumer price index
DRP / debt risk premium
DMIA / demand management innovation allowance
DMIS / demand management incentive scheme
distributor / distribution network service provider
DUoS / distribution use of system
EBSS / efficiency benefit sharing scheme
ERP / equity risk premium
Expenditure Assessment Guideline / Expenditure Forecast Assessment Guideline for Electricity Distribution
F&A / framework and approach
MRP / market risk premium
NEL / national electricity law
NEM / national electricity market
NEO / national electricity objective
NER / national electricity rules
NSP / network service provider
opex / operating expenditure
PPI / partial performance indicators
PTRM / post-tax revenue model
RAB / regulatory asset base
RBA / Reserve Bank of Australia
repex / replacement expenditure
RFM / roll forward model
RIN / regulatory information notice
RPP / revenue and pricing principles
SAIDI / system average interruption duration index
SAIFI / system average interruption frequency index
SLCAPM / Sharpe-Lintner capital asset pricing model
STPIS / service target performance incentive scheme
WACC / weighted average cost of capital
14Control mechanisms
A control mechanism imposes limits over the prices of direct control services and/or the revenues that a distribution network service provider can recover from customers. For standard control services, the National Electricity Rules requires the control mechanism be of the prospective CPI–X form (or some incentive-based variant).[1]
This attachment sets out the revenue cap as the control mechanism for TasNetworks' standard control services for the 2017–19 regulatory control period. It discusses:
- the application of the revenue cap
- compliance with the price controls[2]
- the mechanism through which TasNetworks will recover distribution use of system (DUoS) charges—including adjustments for revenue under or over recovery—in the 2017–19 regulatory control period[3]
- how TasNetworks must report to us on its recovery of designated pricing proposal charges and jurisdictional scheme amounts[4]
- the procedures TasNetworks must apply for assigning or reassigning retail customers to tariff classes.[5]
The control mechanisms applying to TasNetworks' alternative control services are set out separately in attachment 16.
14.1Draft decision
Our draft decision for TasNetworks is as follows:
- The control mechanism for standard control services is a revenue cap.[6]
- Section 14.4.4 contains the revenue cap formulas.
- The revenue cap for any given regulatory year is the total annual revenue, or TAR, calculated using the formula in figure 14.1.
- The side constraints applying to price movements for each ofTasNetworks' tariff classes must be consistent with the formula in figure 14.2.
- TasNetworks must demonstrate compliance with the revenue cap—in accordance with figure 14.1—by including adjustments for DUoS revenue under or over recovery in accordance with appendix A of this attachment.
- TasNetworks must submit as part of its annual pricing proposal, a record of the amount of revenue recovered from designated pricing proposal charges and associated payments in accordance with appendix B of this attachment.
- TasNetworks must submit as part of its annual pricing proposal, a record of any jurisdictional scheme amounts it recovers and associated payments in accordance with appendix C of this attachment.
- Appendix D of this attachment specifies the procedures TasNetworks must apply in assigning retail customers to tariff classes or reassigning retail customers from one tariff class to another.
14.2TasNetworks' proposal
TasNetworks' proposal did not comment on the control mechanism for standard control services. We raised this with TasNetworks which subsequently provided a response clarifying its proposal on the control mechanism.[7]
TasNetworks' response stated that it accepted the revenue cap control mechanism as set out in the AER's final framework and approach (final F&A).[8]It also proposed that the Bfactor parameter of the control mechanism include:
- adjustments for the present value of the DUoS unders and overs account
- annual 'true–up' adjustments for the Electrical Safety Inspection Service charge and the National Energy Market charge
- pass through of additional costs imposed on TasNetworks by jurisdictional legislation, and
- pass through of additional costs for participation in the National Electricity Market.[9]
14.3Assessment approach
Our assessment of the control mechanism was set out in our final F&A. The final F&A set the control mechanism for standard control services as a revenue cap which is then binding on our determination.[10] The basis of the revenue cap must be of the prospective CPI–X form (or some incentive based variant).[11]
Our final F&A deliberately set out a generic formula to give effect to the control mechanism for standard control services.[12] The generic formula requires the control mechanism parameters be specified with more precision in order to be implemented. This draft decision clarifies our position regarding the control mechanism formula and its respective parameters.
14.4Reasons for draft decision
The following discusses the reasons for our draft decision for each parameter of the revenue cap control mechanism, including the reporting on designated pricing proposal charges and jurisdictional scheme amounts.
14.4.1Application of the revenue cap
Total annual revenue
The revenue cap for any given regulatory year is the total annual revenue (TAR) for standard control services. Figure 14.1 contains the revenue cap formula.
Intraperiod adjustment to the weighted average cost of capital
Changes to the TAR resulting from the trailing average cost of debt update will be implemented through annual revisions to the X factors. Further discussion on this adjustment can be found in attachment 3—rate of return—which discusses the WACC annual adjustment and attachment 1—annual revenue requirement—which details issues relating to X factors.
Incentive scheme adjustments (I factor)
The I factor parameter is for annual TAR adjustments relating to a distributor's performance against the incentive schemes.[13]TasNetworks proposed to include in the Ifactor the final carryover amount from the demand management incentive scheme (DMIS) applied in the 2012–17 regulatory control period.[14] We accept this approach as it is consistent with the applicable DMIS and our final F&A.[15]
The final carryover amount is not known at the time of making the 2017–19 determination and must therefore be applied via the control mechanism. Specifically, the DMIS adjustment includes:
- any amount of allowance unspent or not approved by the AER over the period
- the time value of money accrued or lost as a result of the expenditure profile selected by the distributor.[16]
This adjustment will be calculated by TasNetworks and added or deducted from the TAR in its 2018–19 pricing proposal. We will consider these amounts as part of our assessment of that pricing proposal.
Annual adjustments (B factor)
The B factor parameter is for annual TAR adjustments required within the 2017–19 regulatory control period. Consistent with our final F&A, the Bfactorwill include 'trueup' adjustments for DUoSrevenueunder or over recovery,the Electrical Safety Inspection Service charge and the National Energy Market charge.[17]In addition to these adjustments, TasNetworks alsoproposedtoinclude general adjustments for:
- amounts that may arisefrom obligations under jurisdictional legislation, and
- amounts that it may incur for participating in the National Electricity Market beyond those already accounted for through the National Energy Market charges.[18]
The following discusses our draft decision on these adjustments.
Trueup of under or over recovered DUoS revenue
The B factor will include a true-up for the net present value of under or over recovered revenue. These trueups will be calculated through the DUoS unders and overs account in accordance with appendix A.
Under a revenue cap, TasNetworks' revenues in year t will be adjusted annually to clear (or trueup) any under or over recovery of actual revenue collected through DUoS charges in year t–2 and any estimated under or over recovery of revenues in year t–1. With these arrangements, there is a lag between the year the under or over recovery of revenue occurs and the year in which the trueup adjustment is made. To account for this lag, the true-up method will include net present value adjustments.
Our draft decision approach to the DUoS unders and overs account differs to the approach applied to TasNetworks over the 2012–17 regulatory control period. The difference relates to the approach to calculating the net present value of the under or over recovery.
We reviewed the approaches to calculating the net present value in the DUoS unders and overs accounts across jurisdictions. We consider our draft decision approach—which aligns with most other jurisdictions—better reflects the timing of cash flows than the current approach applied to TasNetworks.
Our draft decision approach appliesa full year of interest to opening balances in each year of the unders and overs account to recognise that these cash flows were incurred in the previous year. Then the approach applies a half year of interest to under and over recovery incurred during a year to reflect that these cash flows are not incurred all on one day but rather incurred across the year. We consider this approach is more reliable than the current approach which applies a full year of interest to both the opening and inperiod balances for year t–2 and year t–1 but no adjustments in year t.
We also note that apart from Queensland, our draft decision approach is consistent with the approach applied in all other jurisdictions where a revenue cap is applied.[19] We consider regulatory consistency across jurisdictions is desirable.[20]
Trueup of under or over recovered Electrical Safety Inspection Service and National Energy Market charge revenue
The B factor will also include annual TAR adjustments to trueup the difference between the estimated costs included in TasNetworks forecast operating expenditureand the actual costs it incurs relating to:
- Electrical Safety Inspection Service charges
- National Energy Market charges.
We note TasNetworks is required to undertake electrical inspection services on behalf of Workplace Standards Tasmania in accordance with the Electricity Industry Safety and Administration Act 1997. Under the Electricity Supply Industry Act 1995 (ESI Act), the Minister imposesan electrical inspection service charge on TasNetworks to perform these services. TasNetworks is then allowed to recover these costs from customers through its tariffs.
Also under the ESI Act, TasNetworks is required to contribute to Tasmania's costs of funding the Australian Energy Market Commission (the National Energy Market charge). Under the ESIAct, the Minister determinesthe amount TasNetworks must contribute. TasNetworks also recovers these costs from customers through its tariffs.
As theseare uncontrollable costs, an estimate of the two chargesareincluded in TasNetworks' forecast operating expenditure and annual adjustments are made to the TAR to trueup the difference between the estimate and actual costs. This approach is consistent with current regulatory practice for TasNetworks.
These trueups will be calculated in accordance with the control mechanism formula in figure 14.1. These trueup methods are the same as the methods applied in the 2012–17 regulatory control period.
General regulatoryadjustments
We do not accept TasNetworks proposed adjustments for:
- amounts that may arise from obligations under jurisdictional legislation, and
- amounts that it may incur for participating in the National Electricity Market beyond those already accounted for through the National Energy Market charges.[21]
We do not accept the proposedadjustments because—as noted by TasNetworks—there is no certainty as to whatwould beincluded in these adjustments and whether any adjustment would actually be required.[22]We consider given the uncertainty regarding these adjustments, the general 'catch-all' definitions of the kind proposed is not consistent with incentive regulation. A distributor should manage uncertain events as part of its normal business practice, unless they come within the passthrough event regime which is used for more exceptional or material cases. Incentive regulation is not intended to account for all events that may occur during a regulatory control period.
We also note that a regulatory change event is included in all distribution determinations as a pass through event which is discussed in attachment 15—pass through events.[23] The C factor inour draft decision control mechanism (set out below) makes provision for TAR adjustments related to pass through events.
Cost pass through adjustments (Cfactor)
The C factor is for annual TAR adjustments relating to an AER approved cost pass through amounts. The types of costs that can be included as a cost pass through are set out in attachment 15—pass through events.
S factor adjustments
The S factor parameter is for annual TAR adjustments relating to a distributor's performance against the service target performance incentive scheme. The S factor gives effect to any rewards or penalties related to this scheme—including across regulatory control periods. The scheme requires the S factor to be applied as a percentage adjustment to annual revenue.[24]
The service target performance incentive scheme applying to TasNetworks in the 2017–19 regulatory control period is discussed in attachment 11.
Calculation of the consumer price index escalation
We will apply the annual movement between the Australian Bureau of Statistics' (ABS) published December quarter data for calculating the consumer price index (CPI) escalation.[25]Our draft decision application is a change to CPI escalation applied during the 2012–17 regulatory control period, which was based on movements in the March quarter data.
We note the use of the December quarter data will mean that TasNetworks will apply an actual CPI escalation (rather than an estimated or 'placeholder' CPI escalation) when it submits its pricing proposals.[26] The use of an actual CPI escalation will allow the process for setting prices to be more transparent which is consistent with the intent of the Australian Energy Market Commission pricing rule changes.[27]
The application of this calculation is set out in figure 14.1.
14.4.2Reporting on designated pricing proposal charges
We must decide how TasNetworks will report on the recovery of designated pricing proposal charges for each year of the 2017–19 regulatory control period and how to account for any under or over recovery of revenue associated with those charges.[28]
We apply an under and over recovery mechanism to facilitate this reporting and account for the trueup of under and over recovery of revenue. This approach is the same as the DUoS revenue under and over recovery mechanism and is consistent with the requirements of the NER.[29] The operation of this method is detailed in appendix B.
14.4.3Reporting on jurisdictional scheme amounts
We must decide how TasNetworks will report on the recovery of jurisdictional scheme amounts for each year of the 2017–19 regulatory control period and how to account for any under or over recovery of revenue associated with those charges.[30]
TasNetworks does not envisage that it will be subject to a jurisdictional scheme over the 2017–19 regulatory control period.[31] However, our draft decision includesan under and over recovery mechanism to facilitate any reporting of a jurisdictional scheme should one be imposed upon TasNetworks. This inclusion will negate a requirement to remake the distribution determination in the event a jurisdictional scheme applies.