A practical guide for factory owners, mill managers and CFOs on sizing an industrial rooftop solar plant, calculating real ROI, navigating BPDB/DPDC/DESCO approval, and choosing the right Tier-1 modules and inverters for Bangladesh's climate.
Bangladesh's industrial electricity tariff has risen more than 60% since 2021, and further adjustments are expected as the government phases out fuel subsidies. For factories, mills, cold-storage facilities and large commercial buildings, a grid-tied rooftop solar plant under the SREDA net-metering scheme is now the single most bankable capital investment available — offering a payback of 3–5 years and 20+ years of near-free electricity thereafter. This guide walks through the full decision chain: sizing, ROI modelling, utility approval, module selection and what to demand from an EPC contractor.
Three forces have converged to make industrial solar compelling in Bangladesh today. First, the medium-voltage industrial tariff now exceeds BDT 9–11 per kWh for most consumers, while the levelised cost of solar electricity from a Tier-1 plant is well under BDT 3 per kWh over its 25-year life. Second, Tier-1 module prices have fallen sharply — a 580 Wp N-type TOPCon module from Jinko Solar (Tiger Neo) or JA Solar (DeepBlue 4.0) now costs roughly USD 0.18–0.22 per Wp CIF Chittagong. Third, SREDA's revised in 2025 guideline allows up to 100% of sanctioned load (80% of transformer capacity for MV consumers), making it possible to offset nearly all daytime consumption.
The starting point is your last 12 months of electricity bills. Extract the monthly kWh consumption and identify the daytime share — for most factories, 60–75% of consumption falls between 07:00 and 18:00, which is the window solar can directly offset. The plant should be sized to cover that daytime demand without significantly exceeding the sanctioned load (utilities reject applications that propose more than 100% of sanctioned load (80% of transformer capacity for MV consumers)).
| Industry type | Typical sanctioned load | Recommended plant size | Daytime offset | Approx. capex (USD) |
|---|---|---|---|---|
| Garments / RMG factory | 1,000–3,000 kVA | 600–1,800 kWp | 65–70% | USD 3,60,000–10,80,000 |
| Jute / textile mill | 500–1,500 kVA | 300–900 kWp | 60–65% | USD 1,80,000–5,40,000 |
| Cold-storage facility | 300–800 kVA | 200–600 kWp | 55–60% | USD 1,20,000–3,60,000 |
| Pharmaceutical plant | 400–1,200 kVA | 250–720 kWp | 65–70% | USD 1,50,000–4,32,000 |
| University / hospital | 200–600 kVA | 120–360 kWp | 70–75% | USD 72,000–2,16,000 |
The two flagship plants Vvon has commissioned illustrate the range of outcomes for Bangladesh's industrial sector:
| Project | Capacity | Capex | Annual saving | Simple payback | 25-yr net saving |
|---|---|---|---|---|---|
| Akij Agro Feed, Narayanganj | 1,503 KWp | ~USD 9,00,000 | BDT 2,01,04,500 | ≈ 3.5 years | BDT 45+ crore |
| Ahad Jute Mills, Jashore | 575 KWp | ~USD 3,45,000 | BDT 77,54,000 | ≈ 4 years | BDT 17+ crore |
These figures use a conservative BDT 10.63/kWh blended tariff (June 2026 BERC revision) and a 0.5% annual degradation rate for Tier-1 modules. If the tariff continues to rise — as BERC's trajectory suggests — the payback shortens further and the 25-year net saving grows substantially.
Bangladesh's coastal and riverine climate presents specific stressors: high humidity (>80% RH for 6+ months), salt-laden air in coastal districts, heavy monsoon rain, and occasional hailstorms. The module specification must address all of these:
Vvon supplies Jinko Solar Tiger Neo, Canadian Solar HiKu7 and JA Solar DeepBlue 4.0 — all Bloomberg Tier-1, all IEC 61701 salt-mist certified, all with 25-year linear performance warranties backed by manufacturers with regional offices.
The approval authority depends on your grid connection: DPDC for Dhaka city south, DESCO for Dhaka north and Gazipur, BPDB for most other districts, and REB/PBS for rural palli-bidyut connections. The process is the same across all utilities — submit the SREDA-format application with SLD, equipment datasheets and structural certificate — but processing times vary. DPDC and DESCO typically respond within 45–60 days; BPDB district offices can take 60–90 days.
Vvon Technologies Limited is an authorized EPC partner for Jinko Solar, Canadian Solar, JA Solar, Solis, Growatt, Sunways, Huawei and Schneider Electric. Our in-house team handles feasibility, SLD design, structural engineering, utility approval, procurement, installation, commissioning and O&M — with no sub-contracting of critical works. We have delivered 7+ MWp of industrial rooftop solar across Dhaka, Narayanganj, Jashore and Chattogram.
Send us your last 12 months of electricity bills and a satellite view of your roof, and we will return a free indicative sizing, ROI model and payback calculation within five working days. Request a free assessment →