Industrial Solar Ankleshwar GIDC, Panoli and Dahej Factories 2026

A factory rooftop solar system in Ankleshwar, Panoli or Dahej costs about ₹50,000 per kWp in our model and pays back in roughly 3.8 years when each solar unit offsets ₹8. There is no central subsidy for factories. The real return depends on how much of the solar your machines use during the day, what your roof is made of and whether you are on an LT or HT connection.

What a factory owner should know first

Factory solar is a different job from a home rooftop. The roof is bigger but weaker. The load is higher but runs to a shift pattern. The tariff can include demand charges that solar does not touch. And the air in a chemical estate is harder on panels and steel than the air in town.

We have worked across Ankleshwar GIDC, Panoli GIDC and Dahej for years, alongside our home installations in Bharuch district. This post covers the checks we run before we quote a factory, so you know what a sensible proposal should contain.

Rough numbers for commercial connections

These figures come from the same model as our savings calculator. The model uses ₹50,000 per kWp, 550 W panels and 4.2 units per kWp per day, the yearly average for this part of Gujarat.

Monthly bill	Array kWp	Panels (550 W)	Approx cost	Units per month	Model payback
₹10,000	9.9	18	₹4.95 lakh	~1,250	~3.8 yrs
₹25,000	24.75	45	₹12.4 lakh	~3,120	~3.8 yrs
₹50,000	49.5	90	₹24.75 lakh	~6,240	~3.8 yrs

This table fits small workshops, godowns and LT industrial units well. For large factories, especially those on HT supply, a table like this is only a starting point. The per-kWp price for a big plant depends on the structure, roof height, cable runs and inverter choice. The saving depends on your tariff. We do a per-site calculation for those units.

One Panoli factory’s result

Mohammed Saeed owns a factory in GIDC Panoli. The factory’s electricity bill was about ₹1.8 lakh a month. After we installed an 85 kW system, the bill dropped below ₹40,000. That result depends on that roof, that shift pattern and that tariff. Your number will be different, which is why we look at twelve months of bills before we size anything.

Roof types in GIDC sheds

Almost every factory in Ankleshwar, Panoli and Dahej has one of three roof types. Each one needs a different mounting approach.

Metal sheet roofs

Trapezoidal or corrugated metal sheets on steel purlins are the most common shed roof in the estates. Panels usually go on short aluminium rails fixed to the sheet profile or through to the purlins, following the roof slope. This keeps weight low and needs no heavy frame. The sheet condition matters. Rusted, thin or patched sheets should be replaced before 25 years of panels go on top. Every fixing point must be sealed properly, because a leak over a production floor or a raw material store is expensive.

Asbestos cement roofs

Many older sheds in Ankleshwar still have asbestos cement sheets. These are brittle, they crack under a person’s weight, and drilling them releases fibres that are a health risk. We do not treat an asbestos roof like a metal roof. The two workable options are replacing the asbestos with metal sheeting first, or carrying the solar structure on the purlins or a separate steel frame so the sheets carry no load, with proper walkways for workers. Replacement costs more upfront but often solves old leaks at the same time.

RCC roofs

Office blocks, canteens and some newer production buildings have RCC slabs. Here we use an elevated tilted structure, anchored to the slab or ballasted, with row spacing so panels do not shade each other in winter. RCC roofs need more area per kW than flush-mounted metal roofs because of that spacing.

Load and structure checks

Panels and mounting add weight. A flush-mounted system on a metal roof typically adds around 15 to 20 kg per square metre, more for elevated frames. Most sheds can take this, but old structures, modified sheds and roofs with corroded purlins need a proper check. For large systems, a structural engineer’s review of purlin size, spacing and truss condition is worth the cost. We also look at wind. Monsoon storms in this belt can lift badly anchored panels, so fixing spacing and edge zones matter.

Usable area is less than total roof area. Skylights, turbo vents, ridge lines, exhaust stacks and walkways all take space. As a rough guide, a flush metal roof needs about 7 to 8 square metres per kW of usable, shade-free area.

Match solar to daytime load

The best factory systems are sized to the daytime base load, not to the monthly bill total. A unit you use directly offsets your full tariff. A unit exported to the grid earns much less. For net metered consumers the surplus credit is about ₹2.25 per unit under current GERC rules, and that rate can change.

So we look at when your machines run. A single-shift unit that runs 9 to 6 uses most of its solar directly. A three-shift unit uses solar for the day shift and pulls from the grid at night. A unit closed on Sundays or during festival shutdowns exports on those days. We size so that most generation falls inside working hours. Twelve months of bills, plus load data if you have it, give us that picture.

LT, HT and connection rules

Small and mid-sized units are usually on LT supply. Larger factories are on HT supply with a contract demand, demand charges and a different tariff structure. Solar reduces the energy you draw, but it does not always reduce your recorded maximum demand, because demand can peak on a cloudy morning or after sunset. So an HT unit should not expect the same percentage cut on every line of the bill.

The rules on how much capacity you can connect, whether net metering or another settlement applies, and whether a captive or third-party arrangement makes sense are set by GERC and DGVCL and are updated from time to time. We check the current rules for your connection type before we size or quote. If your unit is in a special economic zone or served by a licensee other than DGVCL, the rules for that licensee apply. Our DGVCL net metering guide explains the basics for LT consumers.

Chemical dust and corrosion

Ankleshwar and Panoli are chemical estates. Fine dust, soot and process fumes settle on panels and cut output. Near the estate, cleaning every two weeks in the dry season is a sensible schedule, and roofs close to dryers, kilns or stacks may need more. Dahej adds salt air from the Gulf of Khambhat, which attacks plain steel quickly.

For these sites we specify hot-dip galvanised or aluminium structures and stainless steel fasteners. We route cables away from hot vents and exhaust outlets. Cleaning should use soft water and soft brushes, early in the morning, with no detergent and no pressure washer. Hard borewell water leaves scale, which is common in GIDC areas. Our cleaning and maintenance guide covers seasonal routines in more detail.

Safety and insurance

A factory roof with solar needs safe access for cleaning and maintenance. That means walkways, lifelines or anchor points for workers, and clear paths between panel blocks so fire crews can move. The DC side needs isolators, correct earthing and lightning protection. Inverters should sit in a ventilated, accessible spot away from process heat and chemical storage.

Tell your insurer before the plant is commissioned. Add the solar system to your factory’s property and fire policy, and ask whether they need any drawings or inspections. Some factories also check with their fire consultant. Doing this early avoids a surprise at claim time.

Money matters

There is no central subsidy for factories. PM Surya Ghar covers homes and housing society common facilities only. Businesses can generally claim accelerated depreciation on solar plant, which improves cash flow in the first years. Ask your CA for the current rate and how it applies to your company before you count it in the payback. Our solar panel price guide explains how brand and structure choices change the cost per kWp.

For homes and shops in the same town, see our separate post on rooftop solar in Ankleshwar. If you are comparing installers, our checklist on choosing a solar installer lists the questions to ask any vendor, including us. Details of our factory work are on the industrial solar and commercial solar pages.

Talk to us

Send twelve months of electricity bills and a few roof photos on WhatsApp at 98241 95027 and we will arrange a site visit. You can check rough numbers on the savings calculator first, or come to the shop at Mehfuz Complex, opposite Patel Welfare Hospital, Bharuch.