On-Grid Solar System in Kovilpatti Industrial Estate
Grid-tied solar with TANGEDCO net metering — the most cost-effective technology for three-phase industrial and commercial connections in the SIDCO cluster.
An on-grid solar system in Kovilpatti Industrial Estate is, for most factories in the SIDCO cluster, the most straightforward and financially sound choice available. On-grid (also called grid-tied) systems connect directly to your TANGEDCO commercial or industrial supply through an approved net-metering arrangement. There are no batteries to charge, discharge, and eventually replace. The solar panels produce electricity when the sun shines, your factory uses what it needs in real time, and anything surplus flows to the grid and earns you an export credit. When the sun goes down or drops behind clouds, the TANGEDCO supply picks up seamlessly — the transition is automatic and instantaneous.
For manufacturing units in Kovilpatti Industrial Estate — matchworks, printing presses, textile and cotton processors, light engineering shops — the match between on-grid solar generation and factory consumption is particularly strong. These industries overwhelmingly run day shifts. Peak solar generation and peak factory electricity consumption occur simultaneously, which means most of the solar electricity is consumed directly on-site rather than exported. That direct consumption at your commercial tariff rate delivers maximum savings with zero battery cost. It is the fundamental reason why on-grid systems dominate industrial rooftop solar across Tamil Nadu.
Kovilpatti's climate — semi-arid, hot, with approximately 5.5–6 kWh of solar irradiation per square metre per day — means an on-grid system here generates 4–5 units per installed kW daily. A 50 kW system produces roughly 220–250 units on a clear working day. At TANGEDCO's commercial tariff, that displaces a substantial daily electricity cost while also reducing the recorded demand at your meter — which directly lowers the demand charge component of your commercial bill.
How TANGEDCO net metering works for industrial connections
Net metering is the billing arrangement that makes on-grid solar commercially viable. Under TANGEDCO's net-metering regulations for commercial and industrial connections, an approved bi-directional energy meter tracks both the electricity your factory imports from the grid and the surplus solar electricity you export to it. At the end of each billing period, the imported units and exported units are netted off — you pay only for the difference, or carry forward a credit if you exported more than you imported.
For a daytime-running factory in Kovilpatti Industrial Estate, the practical working of net metering is as follows:
- During production hours (typically 8 AM–5 PM): Your solar array is generating at or near peak output. Your factory machinery is consuming electricity. Solar covers most or all of the load, so your import meter either reads zero or a small top-up amount. The demand registered at your meter is suppressed, reducing the demand charge on your bill.
- During lunch breaks, slow periods, or weekend shutdowns: Generation may exceed consumption. Surplus electricity flows to the TANGEDCO grid and is recorded by the export meter as a credit.
- Evening and night hours: Solar generation is zero. Your factory draws from TANGEDCO as normal — but the credit built up during the day offsets some or all of this import cost.
- End of billing cycle: TANGEDCO's net meter calculates the import-export difference. In a well-sized industrial system, the net import is a fraction of the pre-solar bill.
Three-phase on-grid inverters for industrial connections
All commercial and industrial TANGEDCO connections in Kovilpatti Industrial Estate are three-phase. This is a non-negotiable technical requirement for any on-grid solar system connected to these premises: the solar inverter must be three-phase as well, to avoid creating a phase imbalance that would trip the protection system or fail the DISCOM technical sanction. Single-phase inverters used on three-phase connections will not clear TANGEDCO inspection.
Three-phase on-grid string inverters are available in capacities from about 5 kW (suited to very small commercial premises) up to 100 kW+ per unit. For larger systems, multiple inverters are installed in parallel. The key specifications to look for:
- Efficiency rating: A good quality three-phase string inverter operates at 97–98.5% European weighted efficiency. Lower-efficiency units waste generation as heat and deliver measurably lower annual output.
- Anti-islanding protection: Mandatory under TANGEDCO requirements. This ensures the inverter disconnects from the grid within a specified time if TANGEDCO's supply fails — preventing energisation of the grid cable during an outage (which is a safety requirement for utility lineworkers).
- Grid-code compliance: The inverter must meet Indian grid code requirements (CEA regulations) and be approved for use on TANGEDCO's system. We only specify inverters that meet these requirements.
- Remote monitoring: Standard on modern inverters — you can view real-time generation, export/import data, and fault alerts from a phone app. Useful for verifying system performance without climbing to the roof.
Demand charge reduction — the commercial saving most manufacturers underestimate
Commercial and industrial TANGEDCO bills have two main components: an energy charge (₹ per kWh consumed) and a demand charge (₹ per kVA or kW of registered peak demand). For large manufacturing units in the Kovilpatti estate, the demand charge can account for 20–40% of the total electricity bill. On-grid solar reduces the recorded peak demand during production hours, which directly reduces this fixed charge — in addition to reducing the energy charge by displacing consumed units.
The demand reduction effect depends on how well the solar generation profile matches your peak consumption window. For a factory running 8 AM to 5 PM, solar generation ramps up from about 7 AM and peaks between 11 AM and 2 PM — which typically overlaps with or slightly precedes the factory's own peak production period. A properly sized system can suppress the recorded kVA demand significantly, with measurable impact on the monthly bill independent of the unit-for-unit displacement.
On-grid solar suits the Kovilpatti Industrial Estate profile exactly
Three-phase connections, heavy daytime loads, large unshaded rooftops, high irradiation, and a TANGEDCO net-metering framework that credits exports fairly — each of these factors independently supports on-grid solar, and in the Kovilpatti SIDCO cluster they are all present simultaneously. For a matchworks unit, a cotton processor, or a printing press in this estate, an on-grid system is not a speculative investment. It is a capital asset with a predictable return on investment, a 25-year production life, and a secondary tax benefit through accelerated depreciation that accelerates the payback curve further for any tax-paying business entity.
Is an on-grid system right for your unit? — who it suits and who it does not
| Factor | On-grid solar suits you if... | Consider alternatives if... |
|---|---|---|
| Production hours | Day shift (6 AM – 6 PM) | Night shift only — generation and load misalign |
| Power supply reliability | Stable TANGEDCO supply — no frequent cuts | Frequent long outages that halt production — consider hybrid |
| TANGEDCO connection | Three-phase commercial/industrial LT or HT connection | Single-phase connections need single-phase inverters |
| Electricity bill composition | High energy cost, significant demand charge | Very low tariff connections (rare for industrial) |
| Business tax position | Profitable — can claim accelerated depreciation | Loss-making entities get less benefit from depreciation |
Why Green Point Solar for on-grid industrial installations
Our commercial and industrial proposals include a demand-charge reduction estimate, not just an energy savings figure. This gives a more accurate picture of the total annual saving for your TANGEDCO commercial connection, and in many cases it is the demand-charge component that tips the payback calculation from marginal to compelling. We handle the TANGEDCO technical sanction, protection relay documentation, and meter installation coordination entirely in-house.
Our on-grid installation process for Kovilpatti Industrial Estate
- Free industrial survey: We visit your factory, review your TNEB bills (including demand history), assess the roof, and confirm the technical requirements for your connection type.
- System design & proposal: Itemised cost, three-phase inverter specification, generation estimate, energy and demand savings calculation, and payback projection with and without accelerated depreciation.
- TANGEDCO technical sanction: We prepare and submit the net-metering application with the required protection relay specification, single-line diagram and load calculation.
- Installation: Panel, mounting, inverter, protection panel and metering installation — coordinated around your production schedule.
- Commissioning: Grid synchronisation, protection testing, bi-directional meter installation, and monitoring activation.
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