Key Takeaways
- Agency: Solar Energy Corporation of India (SECI)
- Auction: Tranche V — Government Buildings Rooftop Solar
- Location: Puducherry (government buildings)
- Total capacity: 17.77 MW
- Results announced: March 28–30, 2026
- Winners: Potaliya Petrochemicals (15 MW) and Kishan Infrastructure Industries (2.77 MW)
- Tariff: Rs 4.11 per kWh (both winners)
- Model: RESCO — developer-owned, 25-year supply agreement
What Is This Auction?
Solar Energy Corporation of India (SECI) announced the results of its Tranche V rooftop solar auction in late March 2026, awarding 17.77 MW of grid-connected rooftop solar projects on government buildings in Puducherry.
This is part of SECI's ongoing Government Buildings Rooftop Solar programme — a series of auctions (organised as "Tranches") that empanel Renewable Energy Service Companies (RESCOs) to install, own, and operate rooftop solar systems on Indian government buildings, with no upfront cost to the government. The RESCO developer recoups its investment through a 25-year power supply agreement at the discovered tariff.
Puducherry (formerly Pondicherry) is a Union Territory on India's southeastern coast. Its government buildings — administrative offices, educational institutions, healthcare facilities — are ideal hosts for rooftop solar given Puducherry's strong solar irradiance (approximately 5.0–5.5 kWh/m2/day).
The tender was initially floated in September 2025 for 13.043 MW and was later revised upward to 17.768 MW — a 36% capacity increase reflecting higher-than-expected demand from eligible government buildings.
Auction Results
| Developer | Capacity Awarded | Tariff (Rs/kWh) |
|---|---|---|
| Potaliya Petrochemicals | 15 MW | Rs 4.11 |
| Kishan Infrastructure Industries | 2.77 MW | Rs 4.11 |
| Total | 17.77 MW |
Both winning developers quoted an identical tariff of Rs 4.11 per kWh — a notably clean result where competition converged on a single price point rather than a range.
Potaliya Petrochemicals is an emerging rooftop solar developer that has been active in SECI government building rooftop tenders, winning the largest allocation of 15 MW (84% of total capacity). While primarily associated with petrochemicals, the company has diversified into renewable energy project development.
Kishan Infrastructure Industries won the remaining 2.77 MW — a smaller but meaningful government rooftop solar portfolio.
What Rs 4.11/kWh Means for Government Rooftop Solar
The Rs 4.11/kWh tariff for Puducherry's government buildings rooftop solar is significantly higher than the utility-scale solar tariffs discovered in large auctions (Rs 2.34/kWh at GUVNL, Rs 2.86–2.87/kWh at SECI Tranche XX). This premium reflects several structural factors:
1. Smaller project sizes: Rooftop installations on individual government buildings range from a few kW to a few hundred kW — far smaller than utility-scale plants. Smaller scale means:
- Higher cost per watt for equipment (less bulk discounting)
- Higher EPC cost per MW (more mobilisation, logistics, site-specific work)
- Higher O&M cost per MW (many dispersed sites vs one central plant)
2. 25-year developer commitment: The RESCO model requires the developer to maintain the rooftop system for 25 years, covering equipment replacement, cleaning, monitoring, and grid connectivity. This long O&M tenure increases the tariff required for financial viability.
3. Building access and structural constraints: Rooftop solar on government buildings requires working within existing structural load limits, roof warranties, and heritage building restrictions in some cases. These constraints add project-specific costs.
4. RESCO financing cost: Developers financing systems under RESCO models bear the full capital risk for 25 years. At smaller project sizes, financing costs per kWh are higher than large utility-scale projects that access institutional project finance at better rates.
For comparison: SECI's 5.6 MW Tranche VIII rooftop auction (announced April 2026) for government buildings across India discovered tariffs ranging from Rs 2.97 to Rs 3.97/kWh depending on location and building type. The Rs 4.11/kWh for Puducherry is at the higher end of the RESCO rooftop range but reflects the specific characteristics of Puducherry's government building portfolio.
SECI's Government Buildings Rooftop Programme: National Context
SECI's Government Buildings Rooftop Solar programme has been running since 2019 and has progressively empanelled RESCO developers across India through multiple tranches. Key data:
Tranche structure: Each Tranche covers government buildings in a specific state or Union Territory. Puducherry's Tranche V is the fifth such tender.
Cumulative impact: By Q1 2026, SECI has awarded rooftop solar across dozens of government buildings nationwide — covering IITs, IIMs, CSIR labs, defence establishments, central government offices, and Union Territory government buildings.
Tariff trend: Earlier tranches (pre-2022) discovered tariffs in the Rs 5–6/kWh range. By 2026, tariffs have compressed to Rs 2.97–4.11/kWh — reflecting the dramatic fall in solar panel and inverter costs over the past four years. The Rs 4.11/kWh in Puducherry is competitive compared to Puducherry Power Corporation (PPC) tariffs for government consumers.
Recent SECI rooftop auctions (2026):
| Auction | Capacity | Location | Tariff | Date |
|---|---|---|---|---|
| Tranche V | 17.77 MW | Puducherry | Rs 4.11/kWh | March 2026 |
| Tranche VIII | 5.6 MW | Multiple locations | Rs 2.97–3.97/kWh | April 2026 |
What This Means for Rooftop Solar Buyers
For industrial and commercial solar buyers — including MSMEs, manufacturing units, and commercial establishments — SECI's rooftop auction results provide important market intelligence:
Tariff benchmark for RESCO models: The Rs 4.11/kWh RESCO tariff in Puducherry gives commercial rooftop solar buyers a sense of what market-competitive RESCO tariffs look like for smaller distributed installations. Commercial and industrial RESCO tariffs are typically negotiated bilaterally and can range from Rs 3.50–5.00/kWh depending on system size, location, offtaker creditworthiness, and contract tenure.
Market data for negotiating: Industrial buyers evaluating RESCO proposals from private solar developers can use SECI's publicly discovered tariffs as benchmarks. A RESCO developer proposing Rs 5.00/kWh for a large industrial rooftop in a high-irradiance state is overpriced relative to market.
Own vs RESCO decision: For large industrial consumers with the capital and creditworthiness to secure solar financing, owning the rooftop solar system (CAPEX model) typically delivers better long-term economics than RESCO — effective all-in cost of Rs 2.50–3.50/kWh for owned systems vs Rs 4.11/kWh for RESCO in equivalent conditions. For smaller or capital-constrained businesses, RESCO (no upfront cost) remains the more accessible option.
For a comprehensive comparison of solar ownership models, see our guide on CAPEX vs OPEX vs Open Access solar for Indian businesses and our RESCO / OPEX solar model explained.
Frequently Asked Questions
What is SECI's Government Buildings Rooftop Solar programme?
This is SECI's nationwide initiative to install rooftop solar on government-owned buildings — central ministries, PSU offices, educational institutions, research labs, and Union Territory government buildings. SECI runs competitive auctions (Tranches) where RESCO developers bid to install, own, and operate rooftop solar systems, recovering their investment through 25-year power supply agreements at bid-discovered tariffs.
What tariff did the Puducherry auction discover?
Rs 4.11 per kWh — quoted identically by both winning developers (Potaliya Petrochemicals and Kishan Infrastructure Industries). This is the rate at which these developers will supply solar power from Puducherry's government building rooftops for the next 25 years.
How does Rs 4.11/kWh compare to other SECI rooftop auctions?
It is slightly above the Rs 2.97–3.97/kWh range seen in SECI's Tranche VIII auction (April 2026) for government buildings at multiple national locations. The higher tariff reflects Puducherry-specific factors including location logistics, building characteristics, and competitive dynamics of this specific auction.
Why is SECI procuring rooftop solar on government buildings instead of utility-scale solar?
Government building rooftop solar serves a different purpose than utility-scale projects. It directly reduces the electricity bills of specific government departments, demonstrates solar adoption leadership, and helps India's distributed solar targets (rooftop solar accounts for 25.73 GW of India's 150.26 GW total solar capacity as of March 2026). The RESCO model makes this achievable without government capital expenditure.
Sources
- Potaliya Petrochemicals, Kishan Infrastructure Win SECI's 17.77 MW Rooftop Solar Projects In Puducherry — SolarQuarter (March 28, 2026)
- Potaliya Petrochemicals, Kishan Infrastructure Win SECI's 17.77 MW Rooftop Solar Auction — Mercom India
- SECI Announces Results of 17.77 MW Rooftop Solar Auction — Renewable Watch (March 30, 2026)
- India's Solar Capacity Reaches 150 GW as Renewables Account for 42% of Total Power Mix — SolarQuarter
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