Income tax recovery is limited to the normative return on equity component irrespective of actual tax paid.

The Appellant, Delhi Transco Limited (DTL), is a transmission utility in the NCT of Delhi

DTL filed Petition No. 18/2017 before the Delhi Electricity Regulatory Commission (DERC) for the truing up of financials for FY 2012-13 to FY 2015-16 and the determination of the Aggregate Revenue Requirement (ARR) for FY 2016-17 to FY 2020-21

On 31.08.2017, the DERC (Respondent No. 1) passed the Impugned Order, which the Appellant challenged on five grounds: (i) Administrative General (AG) expenses; (ii) Return on Capital Employed (ROCE); (iii) Non-Tariff Income (NTI); (iv) Income Tax treatment; and (v) Operation Maintenance (OM) expenses

The court applied the DERC Transmission Tariff Regulations, 2011 and 2017, specifically Regulation 6.13 (mandating 75% of STOA charges as NTI) and Regulation 5.22 (limiting income tax recovery to the RoE component)

It invoked the principle of generalia specialibus non derogant, establishing that specific regulations prevail over general ones

The Tribunal relied on the Supreme Court ruling in PTC India Ltd. v. CERC regarding the binding nature of subordinate legislation

It followed the "watertight compartment" principle for tax computation as established in REL v. MERC and subsequent APTEL judgments

Regarding AG expenses, the Tribunal found that the Commission admitted to potential errors regarding audited figures and remanded the base year calculation; however, it upheld the disallowance of water arrears as OM costs are "controllable" parameters that cannot be revisited during true-up without proof of period-specific liability

On ROCE, the Tribunal noted the Commission’s admission of an arithmetic error in the RRB closing and directed a correction

On NTI, the Tribunal held that Regulation 6.13 explicitly permits the licensee to retain 25% of STOA charges; the Commission’s attempt to use general Regulation 5.24 to capture 100% was legally impermissible

It further held that including SLDC income in the Appellant’s transmission ARR amounted to an illegal penalty, as SLDC is a separate statutory function

Regarding Income Tax, the Tribunal clarified that under Regulation 5.22, tax is limited to the RoE component regardless of actual payment, ensuring regulatory predictability

Finally, OM expenses were upheld as normative; since the Business Plan Regulations, 2017 define these costs based on network parameters, the Appellant cannot claim additional employee costs for deputed or future staff

The Tribunal remanded the issues of (i) AG expense calculation for FY 2011-12 based on audited accounts, (ii) correction of arithmetic errors in RRB/ROCE from FY 2008-09 onwards, and (iii) the adjustment of NTI to reflect only 75% of STOA charges and the exclusion of SLDC income

The Tribunal upheld the Impugned Order regarding the disallowance of water arrears, the limitation of Income Tax to the RoE component, the FY 2017-18 NTI projections, and the normative OM expense determination

The State Commission was directed to pass consequential orders within four months