Factory rooftop solar in Sarigam GIDC.
Units in Sarigam GIDC draw most of their power while the sun is up, which is exactly when a rooftop plant produces. Heaven Green Energy designs and builds factory plants with modules supplied as an authorised channel partner of Adani and Qbits inverters. We read your DGVCL bills, check the shed, file the approval and maintain the plant.
Request a Sarigam GIDC load study
Send one recent DGVCL bill and your plot number. Our engineer calls to agree a survey date and tells you which records to keep ready.
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The short answer
Factories in Sarigam GIDC buy power from DGVCL, so a rooftop plant there is approved and metered by DGVCL under GERC rules. Every kilowatt yields about 4 to 4.5 units a day, so 100 kW gives roughly 1.46 to 1.64 lakh units a year. Industrial units cannot claim PM Surya Ghar. They claim 40% accelerated depreciation instead, and any plant above 25 kW is priced only after a load study.
Last reviewed 2 October 2026 · Heaven Green Energy engineering team
Sarigam GIDC in plain numbers
Sarigam is a GIDC estate in Umargam taluka, at the southern tip of Valsad district near the Maharashtra and union territory borders. It is full: almost every plot is allotted, so solar goes on roofs that already exist.
GIDC's own estate register puts Sarigam in its Vapi region, with 1,034 plots over roughly 24.7 lakh square metres, or about 247 hectares. Of those, 965 plots are allotted and GIDC marks the estate as saturated, which means a spare plot there now goes to public auction. The plot mix covers industrial plots, ready sheds, and some commercial and residential land. Wikipedia describes Sarigam as a town and Industrial Notified Area in Umargam taluka.
Why that matters for a plant: a saturated estate grows upwards and inwards, not outwards. Expansion usually means a heavier load on the same connection, so a rooftop array is one of the few ways to add daytime energy without new land. Your licensee is DGVCL, whose Valsad circle office is listed in the district administration's directory.
We could not find an official sector-wise breakdown for Sarigam, and we will not name any company as operating there or as our client. The estate is commonly described as chemical and pharmaceutical, so the four load types below are the ones we see in those units, plus general engineering. Your own bill and process sheet decide which applies.
Reactors, agitators and batch processes
Batch chemistry runs stirrers, transfer pumps and heating or cooling circuits through the working day. That continuous motor draw sits neatly under the solar curve. We log the real load for a few days, because batch cycles can swing hard within a single shift.
Clean rooms, HVAC and chilled water
Pharma and formulation units hold temperature and humidity around the clock, and chillers work hardest on summer afternoons. Generation peaks at the same time. That gives a pharma plant a dependable base of on-site consumption for most of the solar output.
Utilities: air, water and effluent
Compressors, cooling towers, RO plants and effluent treatment pumps run whether production is high or low. They form the floor of your daytime demand. Sizing a plant against that floor keeps export low even on days when a batch is held.
Engineering shops and storage sheds
Lighter units with machining, fabrication or warehousing use less power per square metre of roof. Here the roof can outgrow the load. We cap the plant at what your daytime consumption and the current GERC terms justify, not at the roof edge.
Sizing a Sarigam plant in units, not rupees
A factory plant earns its keep through units it displaces from your DGVCL bill. We do not publish savings in rupees, because your tariff category, demand charges and self-use share change the answer for every unit.
Daytime units are the target. A clean, unshaded roof in Valsad district returns 4 to 4.5 units per kW each day across a year. On that basis, 100 kW yields about 1.46 to 1.64 lakh units annually and 300 kW about 4.38 to 4.93 lakh. Compare those figures with your consumption between morning and late afternoon. The closer the match, the more of the output you use on the spot.
Your sanctioned load caps the plant. DGVCL approves rooftop capacity against your connection, so roof area alone never sets the size. Keep in mind that solar trims units more reliably than maximum demand. A monsoon afternoon can still see full grid draw, so the demand recorded on your meter may not move much. We read a year of bills before any size is proposed.
Tax replaces the subsidy. PM Surya Ghar is a residential scheme, so a Sarigam unit relies on 40% accelerated depreciation for solar power generating systems under Appendix I of the Income Tax Rules. Since 22 Sep 2025, GST is 5% on solar equipment and 18% on the service portion, taken as 30% of a supply-and-install contract, which works out to about 8.9% overall. For reference, a 25 kW system sits in an indicative installed band of ₹10.75 lakh to ₹13.50 lakh, roughly ₹43,000 to ₹54,000 per kW. Bigger plants are priced after a load study, since structure, cable length and metering move the cost per kW.
| Plant size | Units a year |
|---|---|
| 25 kW | 36,500 – 41,063 |
| 50 kW | 73,000 – 82,125 |
| 100 kW | 1,46,000 – 1,64,250 |
| 250 kW | 3,65,000 – 4,10,625 |
| 500 kW | 7,30,000 – 8,21,250 |
Indicative installed cost at 25 kW: ₹10.75–13.50 lakh (market range, not a quotation). Larger plants are priced after a load study of your bills and roof.
This is what we actually build.
Heaven Green Energy installations across India. Not stock photography, and not renders.
What the roof and the process demand
Chemical and pharma sheds add one problem most roofs do not have: corrosive air from vents and scrubbers. We design for the roof's strength, the site's fume exposure and your electrical system together.
Sheeting, purlins and corrosion
Older Sarigam sheds often carry sheeting that has already met years of process fumes and coastal humidity. We check sheet thickness, rust at laps and fixings, purlin size and spacing, then compute the added dead load. Where the steel is tired we tell you to repair it before any panel goes up.
Vents, stacks and safe zones
Arrays stay clear of scrubber outlets, vents and any area your safety team classifies as hazardous. We agree the layout with your safety officer, leave walkways for cleaning and fire access, earth the structure and design lightning protection. Structure coating is specified for the exposure we measure on site.
Inverters, protection and DGVCL interface
Qbits inverters sit in a ventilated spot near the main LT panel, away from process areas. The design carries DC and AC isolation, surge protection, earth pits and the metering DGVCL asks for. For an HT consumer the plant connects behind the transformer on the LT side, documented for inspection.
Approvals: who does what.
No Sarigam plant is switched on until DGVCL approves it. We prepare a file that matches the built plant, which is what keeps the inspection short.
Bills, load and drawings
We study your consumer category, sanctioned load and twelve months of consumption, survey the shed, then fix plant size, layout and a single-line diagram for the licensee's review.
UsApplication and technical check
The application goes in with your consumer number, plant rating, drawings and equipment datasheets. DGVCL tests it against your sanctioned load and the local network, then approves or returns queries.
Us, then DGVCLBuild and safety records
Installation follows the approved drawings. We compile insulation and earthing test results and protection settings, and handle an Electrical Inspectorate clearance where your plant size requires one.
UsInspection and meter
DGVCL inspects the plant and fits or tests the meters. Once energised, the generation shows on your bill. Our engineer attends in person so any point raised is closed on the day.
DGVCLThree ways to fund the plant.
How you pay depends on your tax position and whether you want the asset on your books. Three routes cover most Sarigam units.
Outright purchase
Your company owns the plant and claims 40% accelerated depreciation in the year it is put to use. This route suits a profitable unit that pays tax and wants every unit generated. An AMC with us covers cleaning schedules, periodic inspection and inverter monitoring.
Term loan or equipment finance
Banks and NBFCs fund MSME solar plants, and ownership stays with you, so depreciation still applies. We provide the quotation, bill of materials and unit estimate lenders want. Interest rate and tenure come from the lender, so compare the total cost of each offer.
Third-party ownership
An investor installs and owns the plant, and you pay only for units supplied. There is no capital outlay, but there is no depreciation for you either. Check tenure, buy-out price, roof access and exit clauses closely, because the contract runs for many years.
How the project runs.
Five stages, and you see every drawing before DGVCL does.
Where we work from
Heaven Green Energy has a single office, at Mota Varachha in Surat. We do not have a branch in Umargam or Sarigam. Our channel partner network and field engineers cover Valsad district, running the survey, supervising the build and attending the DGVCL inspection. We tell you this before you sign, not after.
Bill review · Day 1
You send a year of DGVCL bills and plot details. We check category, sanctioned load and daytime use, then say honestly whether a survey is worth your time.
Shed and load survey · Week 1
An engineer inspects sheeting, purlins, vents, shading and the main panel. Where load is uneven, we log it over several days to capture real batch cycles.
Design and quotation · Week 2
You get the layout, single-line diagram, itemised bill of materials and a monthly unit estimate. The price is built from that design, never from a per-kW rate card.
Approval and build · Weeks 3 to 8
We file with DGVCL, procure Adani modules and Qbits inverters, and schedule roof work around production and your safety permits so the shed stays sealed.
Commissioning and upkeep · After approval
DGVCL inspects and energises the plant. You receive test reports and warranties, monitoring goes live, and the agreed maintenance calendar starts.
What businesses say after a year.
Industrial and commercial plants we have built, each labelled with the city where it stands. None is in Sarigam GIDC, and we make no such claim.
250 kW industrial system on our chemical plant. Generation has been 8% above estimate every month. Their O&M team is responsive.
Industrial · Bharuch · 250 kW
80 kW on our hospital rooftop. Diesel backup running time cut by 60%. Heaven Green's structural design cleared all wind-load checks first time.
Commercial · Anand · 80 kW
150 kW at our textile factory dropped power costs by 68%. The ROI calculation they provided was spot-on, break-even under 4 years.
Commercial · Surat · 150 kW
Six things to check with any vendor.
- Sarigam GIDC is DGVCL territory; units across the border in Silvassa or Daman deal with a different licensee.
- GIDC lists Sarigam as a saturated estate of 1,034 plots, so solar is a way to add daytime energy without new land.
- Each kW yields 4 to 4.5 units a day, which makes about 1.46 to 1.64 lakh units a year from 100 kW.
- PM Surya Ghar does not apply to factories; 40% accelerated depreciation does.
- GST on a supply-and-install contract is about 8.9%, from 5% on goods and 18% on a 30% service share.
- Fume exposure, purlin strength and sanctioned load are checked first, and plants above 25 kW are priced after a load study.
Industrial solar in Sarigam GIDC, answered.
Cost & output
What does factory solar cost in Sarigam GIDC?
How much will a 100 kW rooftop plant produce in Sarigam?
Should a batch-process unit size solar to its roof or its load?
Licensee & approvals
Who supplies electricity to Sarigam GIDC?
What documents does DGVCL ask for on an industrial rooftop plant?
Are net metering terms for factories set by DGVCL?
Roof & engineering
Will process fumes damage panels or the structure?
Can solar go near hazardous areas on a chemical plant roof?
Does an HT connection change how the plant is wired?
Finance & tax
Is there a government subsidy for a factory plant in Sarigam?
How is GST charged on an industrial solar contract?
About Heaven Green