Solar for spice and food processing units in Tamil Nadu
Pulverisers, roasters, blenders and packing lines draw their heaviest power in working hours, when solar output peaks. A plant sized to that load is used almost entirely on site, so each unit saves your full energy charge.
Why spice and food plants suit solar
Grinding and pulverising are heavy motor loads, and roasting, drying, blending and packing run alongside them through the day. The load follows the working shift, and the working shift follows the sun.
Size the plant to the daytime base load, not the roof. Many spice units also run cold rooms to protect colour and aroma in storage; those run round the clock and use solar output on Sundays too. For cold rooms on their own, see solar for cold storage.
Food plants need a roof that stays sealed and clean. We fix to the purlins or sheet profile, add walkways so nobody steps on the sheets, and plan cleaning for the grinding dust that settles on the glass.
What solar saves a food plant
These figures assume the plant is sized below your daytime load, so its output is used on site. A 100 kWp plant makes about 1,44,000 units a year; a 500 kWp plant about 7.2 lakh.
| Plant size and tariff | Plant cost | Saving a year | Simple payback |
|---|---|---|---|
| 100 kWp, LT III-B | ₹45–50 lakh | about ₹10.1 lakh | 4.5–5.0 years |
| 500 kWp, HT-I | ₹2.0–2.2 crore | about ₹43.5 lakh | 4.6–5.1 years |
Indicative, year one: 1,440 units per kWp a year, output used on site unless shown, O&M at ₹600 per kWp a year, before tax benefits and tariff changes. Plant costs are indicative; the final price follows a site survey. Network charges: TNERC GISS order No. 8 of 2021; LT III-B pays half under TNERC Order No. 3 of 2025. The charge on captive rooftop solar is contested in the Madras High Court (a December 2024 ruling against it was stayed in April 2025), so check your latest bill.
Run your own numbers in the TNEB bill calculatorWhat we check at a food plant
- 12 months of bills and the load by shift: grinders, roasters, dryers, cold rooms and packing
- Roof sheets, purlins and any skylights over production areas
- Dust and fumes from grinding and roasting, to set the cleaning schedule
- Tariff category (LT III-B or HT-I) and recorded maximum demand
Is there a subsidy?
The PM Surya Ghar subsidy is for homes only. A business that buys its plant can claim 40% accelerated depreciation in the first year; your CA can confirm the benefit.
We found no central or Tamil Nadu scheme that funds rooftop solar for food processors as such. If you are setting up or upgrading a unit with help from a food-processing scheme, such as PMFME for micro enterprises, ask your bank or district resource person whether the solar plant can be included in the project cost.
LT III-B industrial consumers pay only half the rooftop network charge; the Government of Tamil Nadu pays the rest.
Spice and food processing solar: common questions
How much solar does a spice processing unit need?
Size the plant to the daytime load of grinders, roasters, dryers and packing lines, not to the roof. We work it out from 12 months of bills, so almost all the output is used on site.
What does solar cost for a food processing unit in Tamil Nadu?
Indicatively ₹45–50 lakh for 100 kWp and ₹2.0–2.2 crore for 500 kWp, before tax benefits. Used on site, a 100 kWp plant on LT III-B saves about ₹10.1 lakh a year, a simple payback of about 4.5–5.0 years.
Will grinding dust reduce solar output?
Dust on the glass cuts output, so food plants need more frequent cleaning than most. We plan walkways and water points so panels are cleaned on a schedule without anyone stepping on the roof sheets.
Is there a subsidy for solar in food processing?
There is no PM Surya Ghar subsidy for businesses, and we found no scheme that funds rooftop solar for food processors as such. Buyers can claim 40% accelerated depreciation, and LT III-B units pay only half the rooftop network charge.
Can solar run our cold room and grinders during a power cut?
Not on its own: a grid-tied plant shuts down when the grid fails. Critical loads such as a cold room can run on a hybrid inverter and battery sized for them, with the diesel generator as the last resort.
More: solar by industry in Tamil Nadu · industrial solar EPC · 40% accelerated depreciation
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An engineer reviews your EB bill and roof, then sizes the plant to your load. We reply within one working hour, Monday to Saturday, 9 am to 7 pm.
- Plant size from your daytime load, not your roof area
- Savings worked out on your own tariff and network charge
- CAPEX, RESCO or open-access options side by side
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