Tata Power Mumbai grid plan targets ₹15,000 crore capex

Tata Power’s Mumbai transmission business plans about ₹15,000 crore of grid capital expenditure over roughly five years, with approved equity earning a regulated return on equity of 15.5%. The plan includes a 400 kilovolt ring and 18 new substations, while regulated equity reached ₹2,646 crore in Q2 FY27.

What is Tata Power’s Mumbai transmission capex plan?

Tata Power’s Mumbai grid plan is approximately ₹15,000 crore over about five years and comprises a 400 kilovolt, or kV, ring and 18 new substations. The presentation describes this as a Mumbai grid capital-expenditure pipeline rather than an already capitalised asset base, making its delivery relevant to the eventual expansion of regulated equity.

Tata Power also reported more than ₹4,000 crore of DPR schemes under execution in Q2 FY27. These schemes are the nearer execution component disclosed alongside the larger pipeline. Management’s stated mechanism is that every approved DPR capitalised into the asset base increases regulated equity and then earns the regulated return on equity, or RoE.

How does Tata Power earn returns from Mumbai transmission?

Tata Power earns a 15.5% regulated RoE on its approved equity base in the Mumbai transmission business. That rate applies to approved equity, not to the full ₹15,000 crore stated capex plan, and the presentation describes the pipeline as MERC-approved.

The regulated-equity base was ₹2,646 crore in Q2 FY27, and Tata Power said it had compounded at a 12% compound annual growth rate, or CAGR, over three years. The model disclosed in the presentation depends on approved DPRs being completed and capitalised. Therefore, the 15.5% RoE applies to the approved equity base, while the pace of its growth depends on project delivery and approvals.

How have Tata Power’s Mumbai transmission earnings changed?

Tata Power’s profit after tax, or PAT, rose to ₹463 crore in FY26 from ₹227 crore in FY22, while regulated equity increased to ₹2,633 crore from ₹1,653 crore over the same period. This was a ₹236 crore increase in annual PAT and a ₹980 crore rise in regulated equity between the two full financial years.

The progression was not uniform across every year. PAT increased from ₹303 crore in FY23 to ₹318 crore in FY24, then declined by ₹2 crore to ₹316 crore in FY25 before rising by ₹147 crore in FY26. Regulated equity grew by ₹98 crore in FY25, after a ₹233 crore increase in FY24, before rising by ₹427 crore in FY26.

For H1FY27, Tata Power reported regulated equity of ₹2,646 crore and PAT of ₹219 crore. The equity figure was ₹13 crore above FY26, while H1FY27 PAT is not directly comparable with the full-year ₹463 crore reported for FY26 because the presentation labels the periods differently. The figures show the approved equity base remained above ₹2,600 crore in the first half of FY27.

Why does Mumbai demand matter to Tata Power’s grid pipeline?

Tata Power projects Mumbai’s peak electricity demand to rise about 40% to 6,500 megawatts, or MW, by 2031. The presentation attributes the projected increase to data centres, metro systems and electric vehicles. This forecast is management’s demand rationale for expanding transmission capacity through the 400 kV ring and voltage upgrades.

The planned network work also includes upgrades from 110 kV to 220 kV. Tata Power says these investments are intended to improve transmission capacity and availability under N-1 contingency conditions, meaning the grid is designed to maintain supply capability after the loss of one system element. The disclosed reliability objective accompanies the approximately ₹15,000 crore plan and its 18 new substations.

The demand outlook is a projection rather than reported consumption. The source does not provide annual Mumbai peak-demand figures between Q2 FY27 and 2031, nor does it allocate the ₹15,000 crore plan among the 400 kV ring, substations and upgrades. It does identify the connection management sees between projected demand growth, DPR investment and additions to regulated equity.

What other transmission projects has Tata Power scheduled?

Tata Power reported a transmission portfolio of 7,894 circuit kilometres, including 2,170 circuit kilometres of projects under construction. These TBCB projects are presented separately from the Mumbai regulated-transmission discussion, with a 100% Tata Power stake listed for each named project.

Jalpura Khurja Power Transmission Limited, covering 164 circuit kilometres, was commissioned in September 2026. Four projects are listed for FY 2028 commissioning, ranging from 226 circuit kilometres at Jejuri Hinjewadi Power Transmission Limited to 692 circuit kilometres at Bikaner Transmission Limited. Ryapte Power Transmission Limited, with 491 circuit kilometres, is scheduled for FY 2029.

Conclusion

Tata Power’s disclosed Mumbai transmission case combines a ₹2,646 crore regulated-equity base in Q2 FY27, a 15.5% regulated RoE and a roughly ₹15,000 crore five-year grid pipeline. Regulated equity rose from ₹1,653 crore in FY22 to ₹2,633 crore in FY26, while PAT increased from ₹227 crore to ₹463 crore over the same full-year comparison.

The next items to watch are the execution and capitalisation of more than ₹4,000 crore of DPR schemes, progress on the 400 kV ring and 18 substations, and whether Mumbai peak demand develops toward the projected 6,500 MW by 2031. Separately, Tata Power lists four TBCB projects for FY 2028 commissioning and Ryapte for FY 2029, following the September 2026 commissioning of Jalpura Khurja.