Electricity Tariff Setting: CERC and SERC Jurisdiction and Methodology

Executive Summary

Electricity tariff determination in India follows a regulated, cost-plus approach governed by the Electricity Act, 2003. Understanding tariff setting methodology is essential for generators, distribution companies, and industrial consumers:

Regulators: CERC (interstate) and SERCs (intrastate)
Methodology: Cost-plus regulation with Multi-Year Tariff (MYT) framework
Components: Fixed costs (capacity charges) + variable costs (energy charges)
True-up: Annual adjustment for actual vs. projected performance
Consumer impact: Cross-subsidy, tariff categories, industrial pricing

This guide examines tariff determination jurisdiction, methodology, and key regulatory principles.

1. Regulatory Framework

Electricity Act, 2003

Section	Provision
Section 61	Tariff principles and methodology
Section 62	Determination of tariff by Commission
Section 63	Competitive bidding for tariff
Section 64	Procedure for tariff filing
Section 79	CERC jurisdiction
Section 86	SERC jurisdiction

Jurisdictional Division

Regulator	Jurisdiction	Examples
CERC	Interstate generation, transmission, trading	NTPC plants selling to multiple states
SERC	Intrastate generation, distribution, retail	State gencos, discoms
JERC	Joint states without individual SERCs	Goa, UTs

2. Tariff Determination Methodology

Cost-Plus Regulation

Component	Calculation Basis
Capital costs	Project cost, debt-equity ratio
Return on equity	Regulated ROE percentage
Depreciation	Rate of depreciation
Interest on debt	Actual/normative interest rates
O&M expenses	Normative/actual expenses
Working capital	Normative requirements

Two-Part Tariff Structure

Part	Component	Recovery Basis
Fixed/Capacity charges	Capital costs, fixed O&M	Per MW of capacity
Variable/Energy charges	Fuel costs, variable O&M	Per kWh generated

3. Multi-Year Tariff (MYT) Framework

Principles

Principle	Application
Control period	Typically 5 years
Trajectory setting	Efficiency improvements built in
Annual performance review	True-up of actuals
Incentive mechanism	Sharing of efficiency gains

MYT Parameters

Parameter	Typically Set For
Return on equity	Control period
Depreciation rates	Control period
O&M norms	Annual escalation trajectory
Availability targets	Control period
Heat rates/losses	Improvement trajectory

4. Generation Tariff Components

Fixed Costs

Component	Calculation
Return on Equity	Equity × ROE% (currently 15.5% for thermal)
Interest on Loan	Loan outstanding × Interest rate
Depreciation	Capital cost × Depreciation rate
Interest on Working Capital	Working capital × Interest rate
O&M Expenses	Normative per MW or actual

Variable Costs

Component	Calculation
Fuel cost	Heat rate × Fuel price
Variable O&M	Per kWh normative rate

Capacity Charge Formula

Annual Fixed Cost (AFC) = Return on Equity + Interest on Loan + Depreciation + Interest on Working Capital + O&M Expenses

Energy Charge Rate

ECR = (Fuel cost per unit) × (Heat rate / 1000) + Variable O&M per unit

5. Distribution Tariff Categories

Consumer Categories

Category	Typical Usage
Domestic (LT)	Residential consumers
Commercial (LT/HT)	Shops, offices, hotels
Industrial (LT/HT/EHT)	Factories, manufacturing
Agricultural	Irrigation pumps
Public lighting	Street lights
Railways/Traction	Railway electrification

Tariff Components for Distribution

Component	Description
Energy charges	Per unit consumption
Demand charges	Per kVA/kW of connected load
Fixed charges	Monthly minimum charges
Power factor penalty/incentive	Based on PF maintenance
Time of Day (ToD)	Peak/off-peak differential

6. Cross-Subsidy Framework

Cross-Subsidy Mechanism

Subsidized Categories	Subsidizing Categories
Domestic (low slab)	Industrial (HT/EHT)
Agricultural	Commercial
BPL consumers	High-consumption domestic

Cross-Subsidy Reduction

Section 61(g) mandates progressive reduction of cross-subsidy:

Year	Target	Actual Progress
Initial	High cross-subsidy	Baseline
Medium term	Substantial reduction	Varies by state
Long term	Cost-reflective tariffs	In progress

7. Tariff Filing and Approval Process

Annual Tariff Petition Process

Stage	Timeline	Activity
1	November-December	Utility files ARR/tariff petition
2	January-February	Public notice, stakeholder comments
3	February-March	Public hearings
4	March-April	Commission analysis
5	April	Tariff order issued
6	April onwards	New tariffs effective

Petition Contents

Section	Information Required
Capital expenditure	Asset additions, projects
Revenue requirement	Projected costs
Sales forecast	Category-wise consumption
Proposed tariffs	Category-wise rates
True-up claims	Previous year adjustments

8. True-Up and Regulatory Assets

True-Up Mechanism

Element	Treatment
Under-recovery	Added to future tariffs
Over-recovery	Adjusted against future tariffs
Regulatory assets	Deferred recovery
Carrying cost	Interest on regulatory assets

Common True-Up Items

Item	Typical Treatment
Fuel cost variation	Full pass-through
Power purchase cost variation	Pass-through with prudence check
Sales variation	Adjusted
Uncontrollable factors	Full recovery
Controllable factors	Efficiency-linked

9. Competitive Bidding Tariff

Section 63 Framework

Aspect	Requirement
When applicable	New capacity procurement by discoms
Bidding guidelines	MoP Standard Bidding Documents
Tariff adoption	By SERC based on bid results
No cost-plus	Bid tariff replaces cost-plus

Case-1 vs Case-2 Bidding

Type	Location	Fuel
Case-1	Determined by bidder	Arranged by bidder
Case-2	Specified by procurer	Specified source

10. Fuel Cost Adjustment

Fuel Price Adjustment Formula

Component	Adjustment
Coal price variation	Pass-through with formula
Transportation cost	Pass-through
Import parity	For imported coal
Gas price variation	Pass-through

FPPCA (Fuel Price and Power Purchase Cost Adjustment)

Frequency	Adjustment
Monthly	Some states
Quarterly	Most states
Annual	True-up

11. APTEL and Judicial Review

Appeals from Tariff Orders

Forum	Scope
APTEL	Appeal against CERC/SERC orders
Supreme Court	Appeal from APTEL (substantial question of law)
High Court	Writ jurisdiction (limited)

Common Appeal Grounds

Ground	Argument
Jurisdictional error	Regulator exceeded authority
Procedural violation	Natural justice denied
Unreasonable norms	Arbitrary parameter setting
Against statute	Contrary to Act/regulations

12. Key Takeaways for Practitioners

Jurisdiction Matters: CERC for interstate, SERC for intrastate—file petitions before correct regulator.
Cost-Plus Framework: Tariff based on regulated costs—efficiency improvements benefit utilities.
MYT Provides Certainty: Multi-year parameters reduce annual regulatory uncertainty.
True-Up is Critical: Annual adjustment ensures actual cost recovery—document all variations.
Cross-Subsidy Persists: Despite reduction mandate, significant cross-subsidy continues.
Competitive Bidding Growing: New capacity increasingly through bidding rather than cost-plus.
APTEL is Accessible: Tariff orders can be challenged—substantial precedent available.

Conclusion

Electricity tariff determination in India balances cost recovery for utilities with consumer protection through regulated returns and efficiency incentives. The MYT framework provides predictability while true-up mechanisms ensure actual cost recovery. As the sector evolves with renewable energy and market reforms, tariff methodology continues to adapt. Practitioners must understand both the technical aspects of tariff calculation and the regulatory process for effective representation before CERC, SERCs, and APTEL.