India's Energy Infrastructure Boom Driven by Ancillary Stocks

Power Ancillaries: The Backbone of India's Energy Ecosystem

In a market where power demand is no longer cyclical but structural, the real wealth creators are quietly shifting from generators to enablers. The spotlight is moving beyond power producers to the backbone of the ecosystem—the ancillary businesses that build, connect, transmit, and optimize every unit of electricity flowing through the system.

As India accelerates its push into renewables, grid modernization, and electric mobility, these companies sit at the intersection of policy tailwinds and execution capability. From cables and transformers to EPC players and equipment manufacturers, power ancillaries are no longer “supporting actors”; they are emerging as high-growth, margin-expanding, and capital-efficient opportunities.

Our editorial identifies the top power ancillary stocks that are not just riding the cycle, but helping shape India’s energy ecosystem. We have developed a screen that focuses on companies with consistent positive sales and operating profit growth over the past three years, debt-to-equity below 1, return on equity above 15%, and market capitalization exceeding ₹100 billion.

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Top Power Ancillary Stocks

Polycab India

Polycab India is the largest player in the wires and cables segment in India, making it a direct proxy for power infrastructure expansion, real estate growth, and rising electrification demand. The company operates across a diversified portfolio spanning wires & cables (W&C), FMEG products, and EPC solutions, allowing it to participate across the electrical value chain.

Polycab has shown consistent growth, with revenue growing 46% year-on-year (YoY) in Q3FY26, Ebitda rising 34%, and net profit increasing 36%. The wires & cables segment remains the key driver, with domestic business growing 59% YoY, supported by government capex, private investment, and real estate activity.

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CG Power & Industrial Solutions

CG Power & Industrial Solutions operates across Power Systems and Industrial Systems, covering transformers, switchgear, motors, and railway electrification, giving it a critical role across the value chain. The company has delivered a sharp turnaround in recent years, driven by tighter operating discipline, cost optimisation, and a focus on higher-margin segments.

Order inflows remain strong, with the unexecuted order backlog rising 66% YoY to ₹148,590 million, providing multi-quarter revenue visibility. The power systems segment is a key growth driver, delivering 44% YoY revenue growth alongside margin expansion, supported by strong demand and improved execution.

Voltamp Transformers

Voltamp Transformers is a direct proxy for India’s power infrastructure buildout, with a portfolio that includes oil-filled transformers, dry-type transformers, compact substations, and lifecycle services. The company holds a 35% market share in dry-type transformers, supported by licensed technology from Germany’s HTT—creating a durable competitive moat.

Voltamp has reported its highest-ever quarterly revenue at ₹6,300 million, up 30% YoY, while net profit rose 35%. Order visibility remains strong, with ₹19,810 million in fresh orders in FY26, in addition to an opening backlog of ₹9,380 million.

Apar Industries

Apar Industries is a leading player in conductors, cables, and specialty oils, making it a proxy for transmission expansion, renewable integration, and industrial electrification. The company operates across three segments—conductors, specialty oils, and cables—allowing participation across the power value chain.

Apar's conductor order book stands at ₹73,960 million, providing strong revenue visibility. The conductor segment remains the primary growth driver, delivering 25.1% YoY growth in Q3FY26, supported by improved product mix and execution of higher-value orders.

Conclusion

The power sector is no longer just about generation, the real transformation is unfolding across the ecosystem that supports it. As India scales up renewable energy, electrification, and grid modernization, demand for transmission, distribution, and electrical infrastructure is set to rise steadily. Power ancillary companies sit at the centre of this shift, making the space compelling for investors.

From steady compounders in wires and cables, to high-growth opportunities in conductors and smart systems, to operating leverage plays in transformers and EPC—there are multiple ways to participate. However, the trajectory will not be linear, and companies with strong balance sheets, improving return ratios, disciplined execution, and clear growth visibility are better placed to navigate these cycles.