Sterling & Wilson Charts an Independent Course for Its Generator Business
Engineering giant Sterling & Wilson is preparing to publicly list its generator manufacturing subsidiary, Sterling Green Power Solutions, in an initial public offering (IPO) targeting approximately ₹1,500 crore. The company has appointed ICICI Securities and IIFL Capital as lead managers for the issue, according to sources familiar with the plans, a move designed to fund a new phase of aggressive global and domestic expansion.
Sterling Green, headquartered in Silvassa, assembles and distributes diesel generator sets with capacities ranging from 250 kVA to 5,000 kVA. The company has a footprint across India, the Middle East, Africa, Australia, and Malaysia. It plans to deepen its global reach by setting up a new facility in Dubai during the fiscal year 2027 to serve customers in Europe and the US, while simultaneously building a new manufacturing plant in Pune to meet surging domestic demand. The firm has earmarked a capital expenditure of ₹90-100 crore for these projects over FY27 and FY28.
The business is riding a wave of extraordinary demand. According to a recent Crisil Ratings report, the company’s order book nearly doubled in the fiscal year 2026, reaching approximately ₹2,900 crore as of May 1, 2026. This gives it a robust order book-to-revenue ratio of around three times. This surge is overwhelmingly driven by the breakneck expansion of the data centre industry, with marquee clients like Adani, AirTrunk, and DAMAC representing close to 80% of these orders. Provisional revenue for FY26 jumped to ₹1,167 crore, up from ₹868 crore a year earlier, while maintaining a healthy operating margin of 11.5%.
Data Centre Demand and a Parent’s Retreat Reshape Sterling Green
The Data Centre Gold Rush Is Fueling Generators
Sterling Green's growth story is inextricably linked to the data centre industry. As AI workloads and cloud migration explode, data centre construction is booming in India and the Middle East. These facilities require ironclad power backup, making diesel generators a critical component, not an afterthought. The fact that 80% of Sterling Green’s nearly ₹2,900 crore order book comes from massive data centre developers like Adani and AirTrunk shows it has positioned itself as a critical supplier in this new infrastructure race. The proposed Dubai facility is a clear strategic move to be closer to the Middle East’s rapidly growing data centre hubs and to enter European and US markets as a credible player.
Shapoorji Pallonji’s Retreat Creates a New Corporate Identity
The IPO comes after a significant ownership reshuffle. Sterling Green was previously a subsidiary of the Shapoorji Pallonji Group, which held a 56% stake as of March 2024. By March 2025, following a secondary share sale to a group of investors, that stake had fallen to 42%, meaning the unit ceased to be a Shapoorji Pallonji subsidiary. This divestiture, paired with the IPO, transforms Sterling Green from a captive or group-linked entity into an independent public company. For investors, this means a purer play on the power backup and data centre trend, free from any direct association with the wider financial complexities of its former parent conglomerate.
Execution Risk in a Capital-Intensive Expansion
The planned expansion, while logical, carries execution risk. Sterling Green plans to spend ₹90-100 crore on two new facilities simultaneously while also funding broader global ambitions with IPO proceeds. The company must manage a complex international build-out while servicing a rapidly growing order book from demanding, high-profile clients—all while transitioning to life as a newly public company with heightened scrutiny. A misstep in the Dubai or Pune plant setup could lead to execution delays that would directly impact revenue recognition and client confidence.
What the Listing Means for Investors and the Generator Market
- For potential IPO investors: The investment case hinges on the data centre capex super-cycle. Scrutinise the Crisil-cited 3x order book-to-revenue ratio and the 11.5% operating margin for evidence of sustainable, profitable growth, but weigh it against the ₹90-100 crore capex plan that will pressure near-term free cash flows.
- For data centre operators and contractors: Sterling Green is deepening its dependency on the sector. Key clients like Adani and AirTrunk should monitor the company's execution on its Dubai and Pune plants to ensure supply chain continuity is not disrupted by its public-market debut and expansion distractions.
- For competitors such as Kirloskar Oil Engines or Cummins India: A well-funded, newly independent Sterling Green with a €U/US-facing Dubai facility will intensify competition for high-value generator contracts, particularly in the Middle East and Africa data centre market. The company's 11.5% margin offers a new competitive benchmark to consider.
Risk & Opportunity Assessment
| Commercial Risk | Medium | While the 11.5% operating margin is healthy, the ₹90-100 crore investment in two new facilities across continents simultaneously could strain cash flows and pressure profitability during the build-out phase if revenue growth does not perfectly align. |
| Competitive Risk | Medium | The diesel generator market is mature and competitive, with established global players. Sterling Green's reliance on the data centre sector—nearly 80% of its ₹2,900 crore order book—creates a single-point-of-failure risk if that industry's investment cycle cools. |
| Regulatory Risk | Low | Focus on diesel generators could face future headwinds from tightening environmental regulations, especially in European markets targeted via the new Dubai facility, but the immediate 2-3 year horizon appears clear given the critical nature of data centre backup power. |
| Reputation Risk | Low | The company operates in a B2B environment with a few large, sophisticated clients like Adani and AirTrunk. Reputation is linked to product delivery, which is currently strong, as evidenced by its 3x order book. No consumer-facing brand risks are apparent. |
| Technology Disruption | Medium | In the long term, alternatives to diesel backup, such as hydrogen fuel cells or advanced battery storage for data centres, could disrupt the core business. However, the lead time for such a substitution is long, and the immediate term is secure. |
| Commercial Opportunity | High | The data centre boom presents a transformative opportunity. The near-doubling of the order book to ₹2,900 crore and the direct channel to marquee global clients through the new Dubai facility offer a clear path to a step-change in scale and profitability. |
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