Legal Analysis: Delhi Electricity Regulatory Commission vs. Tata Power Delhi Distribution Limited

Citation: 2026 INSC 461
Court: Supreme Court of India
Bench: Justice Alok Aradhe (Division Bench)
Date of Decision: May 7, 2026
Nature of Judgment: Civil Appeal under Section 125 of the Electricity Act, 2003 against APTEL order directing recovery of entire capital cost through depreciation.

Synopsis of the Judgment

TPDDL set up a gas‑based power plant at Rithala, Delhi, as a temporary measure for 5‑6 years to meet peak demand during Commonwealth Games 2010. The Delhi Electricity Regulatory Commission (DERC) approved a Power Purchase Agreement (PPA) with an operational period of six years (till March 2018) and determined the plant’s technical useful life as 15 years. After the plant ceased supplying electricity beyond March 2018, TPDDL sought depreciation on the remaining capital cost over the full 15‑year useful life. DERC allowed depreciation only up to March 2018. APTEL set aside DERC’s order and directed recovery of entire capital cost over 15 years. The Supreme Court reversed APTEL, holding that under Section 61(d) of the Electricity Act, consumer interest is paramount; no depreciation can be recovered for a period when no electricity was supplied. Regulation 6.32 (depreciation over useful life) must be read harmoniously with Regulation 4.1 (tariff as per PPA period) and cannot override the limited operational approval.

1. Basic Information of the Judgment

Field Details Case Title Delhi Electricity Regulatory Commission vs. Tata Power Delhi Distribution Limited Civil Appeal No. 6388 of 2025 Bench Justice Alok Aradhe (Division Bench) Date of Decision May 7, 2026 Citation 2026 INSC 461 Appeal From Judgment dated 10.02.2025 of APTEL

2. Legal Framework

Laws/Regulations

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