Solar for Bottling Plants and Breweries: Sizing, Roof, Approvals and Payback (50 kW+)

A bottling plant or brewery should size solar to its daytime base load, mostly refrigeration, compressed air, utilities and packing lines. Fermentation cooling and cold rooms run at night too, so the bill overstates what solar can serve. Size to the minimum load between about nine and four, stay inside the sanctioned load, and net-meter to 500 kW or go captive.

How does a bottling or brewing load line up with the sun?

These plants are heavy on cooling and light on peaks. A bottling line draws motor load on conveyors, fillers, cappers and labellers, plus compressed air for blow moulding or for the filler. A brewery adds the brewhouse, glycol or ammonia refrigeration for wort cooling and fermentation, and cold storage for finished product. Water treatment, CIP pumps and effluent aeration run continuously. The table is a guide to reading your own half-hourly meter data, not a measurement.

Pull twelve months of bills and, if possible, the half-hourly profile. The lowest load between about nine and four, on a normal production day, is the number that caps a sensible plant. Seasonal demand matters in this sector. A summer sales peak means more production hours and more refrigeration, which coincides with the strongest generation months; a winter trough lowers the base load, and a plant sized to the summer peak will export more in winter. Size to the lower, not the higher, of the two.

How do you size the plant from the bill?

1. Read the sanctioned load or contract demand. A net-metered plant cannot exceed it.
2. Find the daytime base load in the quietest month, not the busiest.
3. Choose a plant whose peak output sits at or below that base load, so nearly every unit is used on site.
4. Check roof or yard area: about 100 square feet of shadow-free roof per kW, and 3.5 to 5 acres per MW for a ground array on our size pages.
5. Ask the DISCOM about headroom on the transformer that serves you.

Our size pages put 100 kW at about 12,000 units a month and 250 kW at about 30,000, at about 120 units per kW per month in north India. The solar calculator turns a bill into a plant size and the sanctioned load calculator tests the limit. For the refrigeration side of the load, our note on refrigeration MEP design failures explains why that load rarely falls to zero.

Roof, shed or yard?

Bottling plants are commonly pre-engineered steel sheds with long spans, and breweries mix RCC process buildings with sheds. A sheet roof needs a purlin load check, the right clamp for the profile, and waterproofing at every fixing; our guide to solar on a PEB sheet roof covers it. Warehouse roofs are often the largest and cleanest area on site. Process roofs carry vents, stacks, condensers and chimneys; keep arrays clear of them and of any refrigeration relief or vent discharge. If you run ammonia refrigeration, ask for corrosion-resistant coatings on structures and cable routes near the plant room, and have the layout checked with your refrigeration contractor.

Many plants have yard or spare land. A ground array avoids the roof and fits above 500 kW where roofs run out, at the cost of foundations, a boundary and a cable run; see our guide to ground-mount solar on factory land. Sugary and dusty air near syrup rooms and bottle stores soils modules, so agree a cleaning method and frequency in the O&M scope.

Which approval route applies, and what about the pollution board?

The Ministry of Power's 2021 amendment raised the net-metering limit to 500 kW, and states set the details. A plant up to that size, within its sanctioned load, is a net-metering case with the DISCOM. Above it, the choices are a behind-the-meter captive plant, or a captive or open-access arrangement. The Green Energy Open Access Rules, 2022 lowered the open-access threshold to 100 kW and provide for approval in 15 days or deemed approval. Our open-access solar page sets out the charges, and the comparison at 500 kW covers the paperwork.

Module rules follow the route. Under MNRE's memorandum of 4 August 2026, net-metering and open-access projects need ALMM List-I modules, and List-II cells if commissioned after 31 December 2026, while a private behind-the-meter plant used solely for captive consumption is outside both lists (Government entities and public sector enterprises excepted). See our ALMM guide.

The pollution board is a separate file. The CPCB sector list, in the version dated 24 August 2026, classes manufacture of non-alcoholic beverages with wastewater of 100 KLD or more as Red and below 100 KLD as Orange. It classes breweries and malteries with fermentation as Red at 100 KLD or more and Orange below that, and classes solar photovoltaic generation as White. A solar plant does not change your category, but check whether your consent conditions need updating; see consent to establish and operate. A brewery also operates under state excise licensing. Whether a change to licensed premises needs the excise officer's permission is a state rule we have not verified; ask before you start work.

What risks are specific to this sector, and how does payback work?

The first is cold-chain continuity. A grid-tied solar plant stops when the grid fails, as a safety function, so it will not keep chillers or fermenters cool in an outage; you still need the DG set and a clean changeover, as our guide to solar, DG and grid switching explains. The second is heat: module output falls as cell temperature rises, so the summer peak in demand is met by a plant at its least efficient. The third is the tariff. Where your state applies a time-of-day tariff, units generated in solar hours are valued at the solar-hour rate, so test payback against that rate; see contract demand and ToD tariffs.

On cost, our published band for rooftop C&I solar is ₹24,000–32,000 per kW excluding GST, indicatively ₹28–32 lakh at 100 kW and ₹68–75 lakh at 250 kW on our size pages. Payback is the capital cost against the bill you stop paying, so it rests on how many generated units your daytime load absorbs and at what rate. Try your own numbers in the solar payback calculator.

How Secured Engineers helps

We design C&I solar in-house, file DISCOM net-metering, Fire NOC and CEIG applications in-house, and deliver MEPF and solar under one contract, which matters on a beverage site where the refrigeration plant, the fire system, the electrical room and the water treatment share the same footprint. We work from offices in Noida (Delhi NCR) and Ludhiana, with 535+ projects across 18+ states and 89.77% repeat clients.

Send twelve months of bills, the sanctioned load and a roof or yard drawing, and we will show the plant size your daytime load supports and the route that applies. See our solar for factories page, message us on WhatsApp, call +91 70099 85817, or ask for a free proposal.