Can Electricity Consumers Be Burdened for Services Not Received?

The Court clarified that depreciation under tariff regulations cannot be claimed as an absolute right merely because the technical useful life of an asset continues. If the plant is no longer supplying electricity to consumers under the approved regulatory arrangement, the burden of unrecovered capital cost cannot automatically be shifted onto consumers.

The judgment arose from a dispute between the Delhi Electricity Regulatory Commission (DERC) and Tata Power Delhi Distribution Limited (TPDDL) concerning the recovery of the capital cost of the Rithala Combined Cycle Power Plant in Delhi. The central controversy was whether TPDDL could continue recovering depreciation for a fifteen-year technical useful life even though the plant had stopped supplying electricity after six years.

The decision is significant because it reinforces that tariff determination under the Electricity Act, 2003 is not merely a financial exercise but a statutory mechanism designed to protect consumer interests while ensuring reasonable cost recovery for utilities.

Facts of the Case

Tata Power Delhi Distribution Limited (TPDDL) is a joint venture between Tata Power Company Limited and Delhi Power Company Limited. The dispute traces back to the period leading up to the Commonwealth Games 2010, when Delhi faced concerns regarding peak electricity demand.

To address this anticipated shortage, TPDDL proposed the establishment of a temporary gas-based power plant at Rithala in Delhi with a capacity of 108 megawatts. The proposal was expressly conceived as a short-term emergency measure. TPDDL sought allotment of land for this purpose, clearly representing that the plant would operate only for five to six years, after which the land would revert to the Delhi Development Authority.

On 24 July 2007, TPDDL formally communicated this intention to the Delhi Development Authority, specifically indicating the limited operational lifespan of the project.

Subsequently, TPDDL informed the Delhi Electricity Regulatory Commission of its intention to establish the plant. The Commission granted in-principle approval in 2009.

Several petitions followed:

• Petition No. 11 of 2009 sought approval for terms governing the sale and purchase of electricity generated by the plant.
• Petition No. 7 of 2010 sought approval for the use of land.
• Petition No. 6 of 2013 sought determination of the final generation tariff.

The plant achieved commercial operation in open-cycle mode on 4 February 2011 and in combined-cycle mode on 4 September 2011.

On 31 August 2017, DERC disposed of all three petitions through a common order.

The Commission:

• Allowed operation of the plant only up to March 2018;
• Approved tariff-related fixed charges;
• Determined the admissible capital cost at ₹197.70 crore instead of the ₹320.17 crore claimed by TPDDL;
• Accepted the technical useful life of the plant as fifteen years.

However, although the technical life was assessed at fifteen years, the regulatory approval framework clearly restricted actual operation and electricity supply to only six years.

Importantly, TPDDL did not challenge this 2017 order.

Subsequent Dispute

Later, TPDDL filed a true-up petition seeking approval of expenditures for the relevant financial years and annual revenue requirements.

On 11 November 2019, DERC allowed depreciation at 6% annually only up to FY 2017–18. This resulted in cumulative depreciation of ₹83.34 crore.

However, the remaining unrecovered capital cost of around ₹94.59 crore, along with carrying costs, was not permitted to be passed through tariff because the plant had ceased supplying electricity after March 2018.

Aggrieved, TPDDL approached the Appellate Tribunal for Electricity (APTEL).

APTEL’s Decision

The APTEL ruled in favour of TPDDL.

Its reasoning was primarily:

• DERC itself had accepted that the useful life of the plant was fifteen years;
• Regulation 6.32 required depreciation over the useful life;
• Therefore, restricting depreciation recovery to only six years was impermissible.

Accordingly, APTEL set aside DERC’s order and directed recovery of the full capital cost through depreciation over fifteen years.

DERC challenged this before the Supreme Court.

Issues Before the Supreme Court

The Supreme Court framed three substantial questions of law:

1. Whether depreciation must necessarily be allowed over the entire technical useful life of an asset irrespective of actual utilisation for electricity supply?
2. Whether Regulation 6.32 gives an absolute right to recover full capital cost through depreciation even after the asset stops supplying electricity?
3. Whether APTEL erred by ignoring the regulatory framework that restricted operation and recovery to six years?

Arguments by the Parties

Submissions of DERC

DERC argued that APTEL fundamentally misunderstood the regulatory scheme.

Its principal submissions were:

• Consumers cannot be made to pay for electricity they never received;
• Recovery beyond March 2018 would violate Section 61(d) of the Electricity Act;
• Regulation 6.32 cannot override the broader statutory objective of consumer protection;
• TPDDL remained free to commercially exploit the plant elsewhere;
• APTEL wrongly treated depreciation as an unconditional entitlement.

DERC emphasised that tariff recovery must correspond to actual electricity supply.

Submissions of TPDDL

TPDDL argued that:

• Regulation 6.32 clearly required depreciation over the useful life;
• No exception limited depreciation to the operational duration under the Power Purchase Agreement;
• The claim was only for recovery of legitimate depreciable capital cost;
• Regulatory inconsistency would unfairly burden utilities.

TPDDL contended that once capital cost was admitted and useful life recognised, the recovery mechanism could not be curtailed arbitrarily.

Statutory Framework

Section 61 of the Electricity Act, 2003

Section 61 governs tariff determination.

Section 61(d) specifically requires the Commission to be guided by:

• safeguarding consumer interests; and
• enabling reasonable recovery of electricity costs.

The Court treated this provision as central.

Section 62 of the Electricity Act, 2003

Section 62 empowers tariff determination for supply of electricity by generating companies to distribution licensees. However, this power must operate within the broader statutory framework.

DERC Tariff Regulations, 2011

Regulation 6.30

Depreciation is calculated on the admitted capital cost.

Regulation 6.31

Depreciation methodology follows prescribed regulatory parameters.

Regulation 6.32

Depreciation is calculated annually using the straight-line method over the useful life of the asset. This was the provision heavily relied upon by TPDDL.

Regulation 4.1

Tariff for supply of electricity must be determined according to the Power Purchase Agreement or approved arrangement for the specified operational period.

This provision became crucial in the Supreme Court’s reasoning.

Supreme Court’s Analysis

1. Tariff Determination is a Regulatory Balancing Exercise

The Court rejected the notion that tariff calculation is a purely mathematical exercise.

It observed that tariff regulation involves balancing:

• reasonable utility cost recovery; and
• paramount consumer protection.

The Court expressly held:

“The consumers cannot be required to pay for a service which they no longer received.”

This became the central principle of the case.

2. Useful Life Does Not Automatically Mean Recoverable Life

The Court distinguished between:

• technical useful life; and
• regulatory recovery entitlement.

Although the plant could technically function for fifteen years, this did not automatically mean consumers must fund depreciation for fifteen years.

The approved framework only allowed electricity supply until March 2018.

Therefore, technical longevity did not create a perpetual tariff claim.

3. Regulation 6.32 Cannot Be Read in Isolation

A major error identified in APTEL’s reasoning was reading Regulation 6.32 independently.

The Supreme Court emphasised harmonious construction.

Regulation 6.32 must be read together with:

• Regulation 4.1; and
• Section 61(d) of the Electricity Act.

Thus, while depreciation methodology may refer to useful life, actual tariff entitlement depends on the approved operational arrangement.

The Court made it clear that Regulation 6.32 does not confer an “absolute and unconditional right.”

4. Finality of the 2017 Regulatory Order

A crucial factor was TPDDL’s failure to challenge the 2017 order.

That order:

• expressly approved operation only up to March 2018;
• structured tariff recovery accordingly.

Because TPDDL accepted that framework, it became binding. The Court held that true-up proceedings cannot be used to reopen settled tariff architecture. This was a decisive point against TPDDL.

5. Availability of Alternative Commercial Use

The Court also noted that TPDDL was not left remediless.

DERC had clarified that the plant could function as:

• a merchant generator,
• a seller to consumers outside Delhi,
• or be commercially transferred.

Thus, TPDDL’s inability to recover costs from Delhi consumers did not mean total commercial impossibility.

This strengthened the Court’s conclusion that burdening consumers was unjustified.

Why APTEL was Wrong

The Supreme Court found multiple flaws in APTEL’s reasoning:

A. Mechanical Interpretation

APTEL adopted a literal interpretation of depreciation rules without considering statutory purpose.

B. Ignoring Consumer Interest

Consumer protection is not optional under electricity regulation. APTEL inadequately considered this statutory priority.

C. Disregarding Final Regulatory Framework

The six-year limitation had already attained finality.APTEL effectively rewrote a concluded regulatory arrangement.

D. Confusing Useful Life with Recovery Period

A plant’s technical life and tariff recovery entitlement are distinct concepts. APTEL improperly conflated them.

Final Decision

• APTEL’s judgment dated 10 February 2025 was set aside;
• DERC’s order dated 11 November 2019 was restored;
• TPDDL’s claim for depreciation recovery beyond March 2018 failed.

The appeal was allowed. No costs were awarded.

Click Here to Read the Official Judgment

Conclusion

The Supreme Court’s decision in Delhi Electricity Regulatory Commission v. Tata Power Delhi Distribution Limited is a significant reaffirmation of consumer-centric electricity regulation.

The Court drew a clear line between legitimate cost recovery and unjustified financial burden. Its reasoning makes one principle unmistakably clear: consumers cannot be compelled to pay for infrastructure that no longer serves them.

The ruling strengthens regulatory certainty, clarifies the interpretation of depreciation provisions, and ensures that tariff jurisprudence remains anchored in fairness rather than mechanical accounting logic.