Solar for Shopping Malls: Sizing, Roof, Approvals and Payback (50 kW+)

A shopping mall should size solar to its daytime base load, not to its monthly bill. Chillers, air handlers, lighting and escalators run from opening to closing, so the afternoon load meets the sun, but the evening peak does not. Size to the minimum load between about ten and four, stay inside the sanctioned load, and use net metering up to 500 kW or a captive route above it.

How does a mall's load line up with the sun?

A mall is one of the better matches for rooftop solar among commercial buildings, because it is open and cooled through the day, seven days a week. The mismatch is at the edges: the early morning before opening, the late evening, and the night, when only security, lifts and basement ventilation run. Use the table as a reading guide for your own half-hourly meter data, not as a measurement.

Where your state applies a time-of-day tariff, the evening is also the dearer period. The Ministry of Power's 2023 amendment to the Electricity (Rights of Consumers) Rules sets the tariff in the eight solar hours 10 to 20 percent below the normal tariff and the peak hours 10 to 20 percent above it, for commercial and industrial consumers with maximum demand of 10 kW and above from 1 April 2024. A unit generated at midday is therefore worth the solar-hour rate, and payback should be tested against that rate rather than the average on your bill.

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. Pull twelve months of bills and, if the meter allows, the half-hourly profile from the DISCOM portal or the mall's own meter data.
3. Find the daytime base load: the lowest load you carry between about ten and four on a normal trading day, in the cooler month. Peak solar output sits at or just below it, so almost every unit is used on site.
4. Check the roof or parking area against the plant: about 100 square feet of shadow-free area per kW.
5. Ask the DISCOM for the headroom on the transformer or feeder that serves you; it tests that before it approves.

The solar calculator turns a bill into a plant size, and the sanctioned load calculator checks the limit. Our guide to sizing rooftop solar against an HVAC base load works through the chiller-plant case, which is the dominant load in a mall.

What does a mall roof allow?

Most malls have an RCC roof, which suits ballasted or anchored structures, but it is crowded. Cooling towers, chiller or condenser decks, air-handler plant, DG exhaust stacks, water tanks, signage frames, lift machine rooms, telecom masts and skylights all take area or throw shadow. Run a shadow study on the actual roof; our note on shadow analysis before solar design shows how much of a roof is usually usable. Keep the array away from air-handler intakes and exhausts, because heat and dust from rooftop plant reduce module output and soil the glass.

Two rules shape the layout. The CEA's Measures relating to Safety and Electric Supply Regulations, 2023 require clear pathways at least 75 centimetres wide with hand rails for roof access and emergency exit on a rooftop solar system, and say a fire detection system and automatic fire suppression system shall comply with the relevant standards. Check the fire layout with the building's fire consultant and the local fire service before the drawing is final; our guide to rooftop solar DC fire safety covers the design points. If roof area falls short, a solar carport over surface parking adds capacity; see our note on carport solar for the cost premium.

Which approval route applies?

The Ministry of Power's 2021 amendment raised the net-metering limit to 500 kW, and states set the details. A mall up to 500 kW and inside its sanctioned load is a net-metering case with the DISCOM. Above that, 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.

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 projects commissioned after 31 December 2026 also need List-II cells. A private behind-the-meter plant used solely for captive consumption is outside both lists, but the exemption excludes Government entities and public sector enterprises. Our ALMM guide explains it.

Malls add a wrinkle: tenants often hold their own DISCOM connections. A plant on the mall's meter serves only that meter. The same memorandum treats virtual net metering and group net metering as forms of net metering, but whether your state commission allows credits to flow to other connections, and on what terms, is a state rule; our note on virtual and group net metering sets out the idea. Confirm with the DISCOM before you promise a tenant anything.

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

The first is who benefits. In most malls the owner buys the power and recovers it from tenants through common area maintenance (CAM) charges or sub-metered billing. Solar savings on the owner's bill should flow into those charges under your lease terms, which is a commercial and legal point, not an engineering one; our note on CAM charges and sub-metering shows the metering side. The second is access: cleaning and maintenance must not disturb trading, so ask for a safe access plan, lifeline anchors and a cleaning method that does not need a closed floor beneath. The third is roof ownership and any advertising or telecom lease on it.

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 capital cost divided by the yearly saving on the bill. At about 120 units per kW per month in north India, a 250 kW plant generates about 30,000 units a month if the roof and sky allow; multiply by the solar-hour rate you actually pay, and count only the units your daytime load absorbs. Run your own tariff in the solar payback calculator, and see the 250 kW cost page.

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 in a mall where the chiller plant, the fire system and the electrical room share the same roof and risers. 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 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.