Commercial Solar System in Kovilpatti Industrial Estate

A commercial solar system in Kovilpatti Industrial Estate addresses one of the biggest variable costs on any manufacturing unit's P&L: the monthly TANGEDCO bill. The SIDCO cluster in Kovilpatti is home to matchworks, offset printing presses, cotton and textile processing units, and a range of light engineering workshops — businesses that run three-phase machinery through most of the daylight hours, generate high demand charges, and carry a daytime electricity bill that compounds with every expansion in production capacity. The structural characteristic that makes this estate particularly suited to rooftop solar is also the most visible one: large, unshaded industrial shed rooftops with a south-facing profile and no surrounding high-rises to create shadow.

Kovilpatti Industrial Estate sits in Thoothukudi District, one of Tamil Nadu's highest-irradiation zones, receiving 5.5 to 6 kWh per square metre per day across the year. That solar resource, combined with the shed rooftop area that a typical SIDCO unit commands, means a factory here can install 50 kW, 100 kW, or even 200 kW or more of solar capacity and have it generating at peak output during exactly the same hours the machinery is running at full load. The match between solar generation profile and industrial daytime load is near-perfect — more so than in any residential or commercial office context.

For commercial and industrial customers, the financial case goes beyond the monthly bill reduction. The Income Tax Act's Section 32 allows businesses to claim 80% accelerated depreciation on solar plant and machinery in the first year of commissioning. For a profitable business that pays corporate income tax, this benefit alone can recover a substantial portion of the system cost in the first financial year — a financial advantage that is unavailable for residential installations and that materially shortens the effective payback period.

Which businesses in Kovilpatti Industrial Estate benefit most?

Not every business type benefits equally from commercial solar, but the specific mix of industries in Kovilpatti Industrial Estate is particularly well-matched to rooftop solar economics:

• Matchworks and fireworks units: Production equipment including mixing drums, pressing machines, and drying lines typically runs during daylight hours — the same window when solar generation is at its highest. Matchworks often occupy single-storey shed structures with large roof areas, enabling substantial array sizes. Reducing TANGEDCO consumption also reduces exposure to tariff increases on industrial HT and LT connections.
• Offset printing presses: Modern large-format and multicolour presses are high-consumption machines. A printing unit running two or three presses simultaneously may draw 30–80 kW during peak production. A rooftop array sized to match this load turns those daytime hours from the most expensive electricity period into the least-cost period.
• Cotton and textile processing units: Carding, spinning, and weaving machinery creates substantial three-phase loads that are continuous through working hours. Solar generation directly offsets these loads, reducing both the energy charge and the demand charge on the TANGEDCO industrial tariff.
• Light engineering workshops: CNC machines, lathes, milling machines, and compressors typically draw power in a pattern well-aligned with solar generation — high daytime, low overnight. Even a 10–30 kW rooftop system on a smaller workshop shed meaningfully reduces the monthly bill.
• Schools and institutional buildings near the estate: Schools and training centres adjacent to the industrial estate typically run from morning to afternoon — a load profile almost perfectly aligned with solar generation hours. Commercial solar makes as much sense for an institution as for a factory.

Accelerated depreciation: the Section 32 advantage

Under Section 32 of the Income Tax Act, solar power plants are classified as plant and machinery eligible for 80% accelerated depreciation in the first year of commissioning. This means a company that installs a ₹50 lakh solar system can claim ₹40 lakh as a depreciation expense in Year 1 of assessment, reducing its taxable income by that amount. For a business in the 30% corporate tax bracket, that translates to a tax saving of approximately ₹12 lakh — effectively a direct offset against the capital expenditure. No other single incentive available to industrial businesses in Tamil Nadu delivers this magnitude of first-year financial benefit.

The accelerated depreciation benefit is available to companies, LLPs, and proprietorships that are income-tax assesses with sufficient taxable income. Green Point Solar recommends that business owners discuss the specific application of this benefit with their chartered accountant before finalising the solar investment decision, as the quantum of benefit depends on the taxpayer's exact tax position.

System size and ROI — commercial benchmarks for SIDCO units

These are indicative figures based on approximately ₹62,000 per kW installed cost and 4.5 units average daily generation per kW. Actual payback is typically shorter when accelerated depreciation tax benefits are included in the calculation. For a profitable business claiming the full 80% first-year depreciation, the effective net cost of the system after tax benefit is substantially lower than the gross figure above.

Three-phase systems: the industrial standard

Nearly all manufacturing units in Kovilpatti Industrial Estate operate on three-phase TANGEDCO supply. Commercial solar systems for these units are therefore designed as three-phase on-grid systems, with string or central inverters that match the factory's three-phase distribution board. Three-phase inverters balance the load across all three phases and ensure the net-metering measurement reflects the total three-phase import and export accurately. Green Point Solar designs and installs three-phase commercial systems from 10 kW upward, and carries out the TANGEDCO net-metering application for three-phase industrial connections as a standard part of the project.

TANGEDCO net metering for commercial & industrial connections

TANGEDCO operates a net-metering scheme for commercial and industrial rooftop solar systems. Under net metering, a bidirectional meter records both import (grid power drawn by the factory) and export (surplus solar fed back to the grid). At the end of each billing cycle, the factory pays only for net import. During periods when solar generation exceeds factory consumption — midday on weekdays when loads are lighter, or weekends when production is reduced — the surplus export is credited against future bills. For factories with high daytime loads, net export events are infrequent; the solar generation is consumed in real time, and the net-metering mechanism primarily serves to record and bill the residual grid-drawn power accurately. Green Point Solar prepares and files the TANGEDCO net-metering application for commercial and industrial connections as part of every project.

Why Green Point Solar for commercial solar in Kovilpatti Industrial Estate

Green Point Solar is an MNRE-approved installer based in Kovilpatti, with direct experience of commercial and industrial rooftop projects in Thoothukudi District. We have surveyed and designed systems for the specific shed roof types and three-phase load patterns common in the SIDCO cluster. Our commercial proposals include a full ROI model — energy savings, demand-charge reduction, and accelerated depreciation benefit — so business owners can make an informed capital expenditure decision rather than relying on headline payback claims.

Commercial solar installation process

1. Load and bill analysis: We review your TANGEDCO bills for the past 12 months to understand consumption, demand charge, and seasonality.
2. Roof survey: We assess available shed roof area, orientation, shading from roof-mounted equipment or adjacent structures, and structural loading capacity.
3. System design and proposal: We prepare a detailed proposal with array layout, inverter configuration, expected generation, savings breakdown, accelerated depreciation calculation, and payback period.
4. Procurement and supply: Tier-1 solar modules and industrial-grade inverters with full manufacturer documentation are sourced.
5. Structural installation: Galvanised mounting structure and panels are installed by our technicians, minimising production disruption — we schedule heavy work for non-production hours where required.
6. Three-phase electrical connections: DC and AC cabling, inverter installation, protection devices, metering, and earthing per standards.
7. TANGEDCO commissioning: Net-metering application, inspection coordination, and bidirectional meter installation.
8. Handover and monitoring: System commissioning, monitoring platform setup, and operator briefing.

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• Commercial Solar System in Kovilpatti
• Request a Commercial Solar Survey

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