A solar plant is a low-working-capital, steady-cash-flow asset, so its DPR turns on three levers: capex per kW, how much the plant generates (CUF), and payback. In sunny Rajasthan, all three tend to favour the project.
The choice sets your capex, revenue model and approvals, so the DPR should fix it at the outset.
Almost the entire project cost is capital equipment — modules, inverters, mounting structure, cabling, evacuation and installation. Cost is expressed per kW (or per MW) and has fallen steadily as module prices have dropped, so any figure must be quotation-based and current. Working-capital margin is small. Because the asset is the security and generation is predictable, lenders view well-sited solar favourably.
Note: per-kW capex and applicable tariffs change frequently — always base the DPR on live supplier quotations and the current DISCOM/regulatory position rather than a rule of thumb.
Output is driven by the Capacity Utilisation Factor (CUF) — the share of nameplate capacity actually generated over a year. Rajasthan enjoys among the highest solar irradiance in India (the Jodhpur–Jaisalmer–Bikaner belt especially), so CUF here sits at the upper end of the national range. A credible DPR states the CUF assumption and its basis, and factors in gradual module degradation over the plant's 25-year life.
Revenue is either the electricity-bill savings a captive rooftop plant delivers (valued at your current tariff), or the tariff under a PPA / open-access sale for a ground-mount plant. With low running costs and no raw material, a well-sited solar plant often shows a payback in the region of 4–6 years and strong DSCR once operational — though this depends entirely on capex, tariff and CUF, which the DPR must model with sensitivities.
Solar assets attract accelerated depreciation, a significant tax shield in the early years that improves post-tax cash flow — a lever the DPR should quantify. Depending on the setup, RIPS-type capital support and the interest subsidy on the term loan may also apply. See the renewable-energy subsidy guide; and note that solar-rich districts like Jaisalmer are natural homes for these projects.
It depends on your goal. Rooftop captive plants offset your own bill via net metering at lower cost per kW; ground-mount plants are larger and sell power under a PPA or open access. Fix the model first, as it drives cost, revenue and approvals.
Rajasthan has among the highest solar irradiance in India, so CUF sits at the upper end of the national range — but the DPR should state the specific assumption, its basis, and factor in annual module degradation.
Well-sited plants often show payback in roughly 4 to 6 years, driven by low running costs and no raw material — but this depends entirely on capex, tariff and CUF, which must be modelled with sensitivities.
Solar assets attract accelerated depreciation, a meaningful early-year tax shield that improves post-tax cash flow. RIPS-type capital and interest support may also apply depending on the setup.
Send us your load or site details and whether it's rooftop or ground-mount. We'll model capex, CUF, revenue and payback with sensitivities, and quantify depreciation and any RIPS benefit. First assessment free.
Related reading: How to Prepare a DPR for a Bank Loan · Renewable & Solar Subsidy Guide · Jaisalmer Subsidies · RIPS 2024 Capital Subsidy · DPR Format for an MSME Loan
CA Nikhil Gupta builds solar DPRs modelled on real capex, CUF and payback, with depreciation and RIPS benefits quantified. Free assessment, no upfront fee.
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