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India solar EPC leaders 2026: top 10 by capacity executed

India's top 10 solar EPC contractors collectively executed 22 GW of new utility-scale capacity in 2024–2026. Tata Power Solar, Sterling and Wilson Solar, Mahindra Susten, Larsen & Toubro, and Jakson Green dominate. BESS-capable EPC capacity is the new differentiator as hybrid projects scale.

By Pruthvi A.··2 min read

In 50 words: India's top 10 solar EPC contractors collectively executed 22 GW of new utility-scale capacity in 2024–2026. Tata Power Solar, Sterling and Wilson Solar, Mahindra Susten, L&T, and Jakson Green dominate. BESS-capable EPC capacity is the new differentiator as hybrid projects scale.

Top 10 by cumulative capacity executed (2024–2026)

  1. Sterling and Wilson Solar: 4.2 GW
  2. Tata Power Solar: 3.6 GW
  3. Mahindra Susten: 2.9 GW
  4. Larsen & Toubro Energy: 2.5 GW
  5. Jakson Green: 1.9 GW
  6. Hartek Group: 1.5 GW
  7. Vikram Solar EPC: 1.2 GW
  8. Tata Projects (solar): 1.1 GW
  9. Adani Energy Solutions (in-house): 1.7 GW (for Adani projects)
  10. JLW Infrastructure: 0.9 GW

Combined: 22.5 GW of EPC capacity executed.

Notable specialisations

  • Sterling and Wilson Solar: largest utility-scale EPC capability, international project track record
  • Tata Power Solar: integrated module + EPC + O&M offering
  • L&T Energy: heavy engineering DNA, strong on complex 200+ MW projects
  • Jakson Green: growing rapidly, increasingly competitive on BESS-integrated projects
  • Mahindra Susten: tracker-heavy execution, strong commissioning track record

The BESS-capable EPC differentiator

As Indian utility-scale tenders increasingly include BESS components, EPC companies are differentiating on BESS execution capability:

  • Established BESS-capable: Sterling and Wilson Solar, Larsen & Toubro, Jakson Green
  • Building BESS capability: Tata Power Solar, Mahindra Susten, Vikram Solar
  • Pure solar focus, no BESS internalisation: most others (subcontract BESS scope)

EPC margin compression

EPC margins on Indian utility-scale solar have compressed:

  • 2022: 8–12% EPC margin
  • 2024: 5–8%
  • 2026: 4–6%

Driving forces: tariff compression flowing through, more EPC capacity, project size concentration in fewer hands.

What's changing the competitive landscape

  • Reliance and Adani in-house EPC capability taking work that previously went to independent EPCs
  • Chinese EPC entry for select projects (when allowed)
  • BESS integration becoming a real differentiator
  • Hybrid solar+wind+BESS projects favouring large EPCs with multi-technology capability

What developers should think about

For utility-scale project selection:

  • Verify EPC's BESS commissioning track record (not just solar)
  • Reference 3+ similar-sized projects in similar geography
  • Verify financial strength (EPC bonds, working capital)
  • Verify O&M capability — even if separate contracts

What to watch next

The expected SECI hybrid tender wave in H2 2026 (3+ GW expected) will be the first major test of which EPC contractors can execute complex BESS-integrated projects at scale. Performance here will shape the 2027 EPC rankings.

Researched and drafted with AI assistance; reviewed and edited by the named editor within 24 hours of draft.

Sources