Sterling and Wilson Renewable Energy is a solar EPC and O&M contractor whose near-term earnings depend on converting a INR12,481 crore order book, including eight unstarted projects, into H2 FY27 revenue while holding EPC gross margin at 8% to 10% and growing the 18.9 GW O&M annuity. The operating-leverage case is credible but not yet proven: management guides FY27 revenue growth of up to 10% ex-Reliance and O&M revenue above INR400 crore, while Q2 operating EBITDA was only 3.7% and H1 revenue fell 11%. A Reliance order remains an option outside guidance, not a base-case input.
The business economics are project-based and working-capital-light. EPC revenue is recognized on a percentage-of-completion basis, with turnkey contracts carrying lower percentage margins because modules pass through at near-cost, and BoS contracts carrying better margins. Management guides EPC gross margin at 8% to 10% depending on mix. O&M is the annuity counterweight: gross margin was 23% in Q2 FY27 and is guided around 20%, with low overheads. The group therefore earns a thin spread on large EPC revenue and a thicker margin on a smaller O&M stream. Q2 FY27 shows the mix effect: revenue was INR1,527 crore, domestic EPC INR1,366 crore, international EPC INR62 crore and O&M INR99 crore; operating EBITDA was INR56 crore at 3.7%. H1 operating EBITDA was INR134 crore versus INR184 crore a year earlier because international revenue fell to INR165 crore from INR929 crore. The operating-leverage mechanism is fixed overheads: recurring overheads were INR84 crore in Q2 and management expects them at around 4.5% of revenue for FY27, so incremental domestic and international execution should drop through to EBITDA if gross margin holds.
The earnings path is back-loaded. H1 FY27 revenue was INR3,118 crore, 11% lower, as four older international projects completed and eight new projects, four in India and four overseas, waited for LOA or NTP. Management guides FY27 revenue growth of up to 10% ex-Reliance and expects Q3 to be better than H1 and Q4 to be the stronger quarter. The Egypt West Minya project, a 1,000 MW AC solar plant with 600 MWh storage valued at about USD560 million through a 50-50 JV with Hassan Allam, has received NTP and started work. Management expects revenue this year, with Q4 heavily loaded, a roughly 14-month project and turnkey margin above 8%. The South Africa BESS order for 616 MW, split into two 308 MW turnkey projects, adds a storage reference. The Adani framework also has a next 1.2 GW RFQ received and expected to close soon. These are the concrete milestones that would validate the H2 ramp. They are guidance and management expectation, not achieved revenue.
The O&M path is clearer but smaller. The portfolio reached 18.9 GWp in Q2 FY27 from 13.5 GWp in March 2026, and Q2 O&M revenue was INR99 crore, up 55%, with H1 at INR183 crore, up 48%. Management guides FY27 O&M revenue above INR400 crore and gross margin around 20%. If achieved, O&M would contribute roughly INR80 crore of gross profit at a 20% margin, with minimal overhead, which is meaningful against a group operating EBITDA base that was INR134 crore in H1. The risk is that the full portfolio contribution is still a ramp, and the Q2 gross margin of 23% is above the guided level.
Capital allocation is focused on credit lines and working capital rather than plant capex. Gross borrowings fell by INR244 crore in H1 to INR920 crore as term loans were repaid, cash was INR319 crore and net debt was INR601 crore. The company secured over INR3,000 crore of new credit lines, including South Africa, and operates with negative working capital of INR301 crore. But receivables including unbilled revenue were INR3,005 crore, and receivable days rose to 176 from 138 in March. The negative working capital model is an advantage only if customer advances and supplier credit keep pace with execution; otherwise the H2 ramp absorbs cash. There is no company-funded manufacturing or capacity capex programme in the supplied disclosures, so the capital allocation question is credit discipline and legacy claim recovery, not project ROIC.
Management delivery is mixed. FY26 revenue of INR7,548 crore was delivered at 20% growth, and the banking-limit build-out was delivered. But the Conti arbitration produced a INR580 crore write-off after management said it did not expect substantial receivable write-offs, and Nigeria produced a INR2,038 crore standalone impairment after being described as on track. The FY27 revenue guide has been cut from 15% to 10% to 15% to up to 10%. That history argues for treating the H2 ramp as a promise to be verified, not a base-case certainty. The Q2 call does not resolve the US legacy cases, and the Chile settlement depends on customer and promoter payments.
The investment thesis therefore turns on three falsifiers. First, H2 revenue must accelerate enough to deliver up to 10% FY27 growth; if Q3 is only modestly better than Q2 and Q4 does not carry the year, the operating-leverage case fails. Second, EPC gross margin must stay at 8% to 10% and O&M at around 20% as ALM 2-compliant cell costs and competitive bidding pressure the mix. Third, working capital must not absorb the H2 ramp: receivable days at 176 and receivables including unbilled revenue of INR3,005 crore are the warning signal. A Reliance order would be incremental, but it is not in guidance and no quantum has been committed. The thesis is an operating-leverage recovery with a credible order book and a still-unproven H2 execution path, not a demonstrated compounder.
companyname: Sterling and Wilson Renewable Energy Limited ticker: SWSOLAR sector: Renewable Energy - Solar EPC and O&M Sterling and Wilson Renewable Energy Limited (SWREL) is a pure-play solar EPC and O&M company. It designs, engineers, procures, constructs, and commissions utility-scale solar power plants, floating solar projects, hybrid solar-plus-storage systems, and wind projects, then operates and maintains those assets for years after commissioning. The company was demerged from the Sterl...
Read the full report →geographic expansion, order book surge
FY27: revenue growth up to 10% ex-Reliance; EPC gross margin 8% to 10%; O&M gross margin around 20%; O&M revenue above INR400 crore; order book above INR10,000 crore at FY27 end; international revenue expected to rise significantly in H2 as Egypt and South Africa execute.
Guidance upgradedmixed
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