Grid-Scale Battery Energy Storage Systems Manufacturing Facility

Project Overview

An Indian renewable energy developer-manufacturer consortium and a European power electronics technology partner engaged IMARC Engineering to establish a greenfield grid-scale Battery Energy Storage System (BESS) integration and container manufacturing facility in Raipur District, Chhattisgarh. The project was structured against the Government of India's BESS Viability Gap Funding (VGF) scheme, an INR 3,760 Crore corpus approved by the Ministry of Power in September 2023 targeting 13,200 MWh of grid-scale BESS deployment, the SECI BESS competitive tender framework, and the Central Electricity Authority's grid-interconnection technical standards applicable to utility-scale battery storage.

The project involved establishing 2 GWh per annum of BESS integration capacity (100 utility-scale storage containers at 20 MWh each, targeting the 4-hour storage duration format that dominates the Indian utility BESS tender pipeline), covering LFP cell integration, Power Conversion System (PCS) integration, Battery Management System (BMS) integration, thermal management including active liquid cooling, fire safety and containment, and the 20-foot and 40-foot container assemblies with grid-interconnection interfaces. Site infrastructure was designed for Phase 2 expansion adding a second assembly hall and a dedicated behind-the-meter C&I energy storage product line.

Client's Challenges

The client faced several specific challenges in establishing greenfield grid-scale BESS manufacturing in India:

• LFP cell integration at scale: Engineering high-throughput LFP (Lithium Iron Phosphate) cell integration into module and rack assemblies to the tolerances required for balanced BESS container operation, with associated cell-level testing, module-level assembly, and rack-level integration workflow across 100 containers per annum.
• BMS, PCS, and thermal integration: Coordinating the integration of Battery Management Systems, Power Conversion Systems (grid-tie inverters), and active liquid cooling infrastructure within a single BESS container assembly framework, with the associated software and firmware integration and grid-interconnection compatibility testing.
• Fire safety and containment: Engineering fire safety and containment infrastructure to UL 9540A thermal runaway propagation testing standards, a defining engineering challenge for grid-scale BESS given the industry-documented fire risk history and the resulting insurance and utility customer safety requirements.
• BESS-VGF Domestic Value Addition: Meeting the BESS Viability Gap Funding scheme's Domestic Value Addition milestones progressively across the scheme window in a category where LFP cells representing approximately 55 to 60 percent of BOM cost remain substantially imported.
• CEA grid-interconnection standards: Securing Central Electricity Authority technical standard verification for grid-tie inverter performance, harmonic distortion, low voltage ride-through, and reactive power support, required inputs for utility acceptance and grid connection approval.
• Workforce build-up: Recruiting 380 personnel including BESS integration engineers, PCS and BMS specialists, thermal management engineers, and skilled assembly technicians in the Raipur regional labour market that also serves the broader Chhattisgarh industrial and power sector ecosystem.

What We Did

• Pre-Investment and Strategic Advisory

Our feasibility study evaluated four candidate locations across Chhattisgarh, Himachal Pradesh, Andhra Pradesh, and Gujarat, with Chhattisgarh selected for its strategic central India location, making it well suited for pan-India BESS logistics. The state also offered proximity to a growing renewable energy pipeline and industrial power infrastructure, established industrial land and supporting infrastructure, an attractive incentive framework under the Chhattisgarh Industrial Policy, and access to the emerging engineering talent pool from IIT Bhilai and NIT Raipur.

CapEx planning of INR 720 Crore covered the BESS integration hall, the PCS and BMS integration area, the thermal management and testing zone, the container assembly bay, the outbound logistics area, and central utilities. Financial modelling demonstrated post-tax IRR of 22.4 percent at full ramp with a 5.8-year payback.

• Engineering and Design Services

IMARC designed a 32,000 sq.m built-up facility on a 16-acre plot comprising the LFP cell receiving and module integration hall, the rack and PCS integration area, the thermal management assembly and testing zone (with active liquid cooling loop assembly and integrated system pressure testing), the fire safety and containment integration area, the 20-foot and 40-foot BESS container final assembly bay, the on-site grid-simulator test bay for pre-shipment functional verification, and the outbound logistics area.

Process utility design covered 6 MW grid demand supplemented by a 2 MW captive rooftop solar array with a small demonstration BESS installation (using in-house-manufactured product), ESD-controlled environment throughout the electronics integration zones, precision temperature and humidity HVAC, dedicated fire suppression infrastructure for the cell-handling and integration areas, and integrated MES for cell-level and container-level lot traceability aligned with BESS product warranty and recall management requirements.

• Procurement and Supply Chain Support

We executed a multi-geography procurement programme across 52 critical vendors. BESS integration equipment including automated cell handling, rack assembly, and container fit-out equipment was sourced from established European and Asian specialists.

Power Conversion Systems for the grid-tie inverter integration were sourced under structured technology partnership from established European power electronics specialists supplemented by progressive qualification of Indian PCS manufacturers. Battery Management System hardware was sourced from Indian and international specialists under the technology partnership.

Thermal management infrastructure including chillers, pumps, and liquid cooling loop components was sourced from a combination of Indian and international specialists. LFP cells were sourced under structured long-term agreements with established international cell suppliers, with the progressive Indian ACC PLI cell manufacturing ramp providing the pathway toward deeper cell-level DVA over subsequent years. BESS-VGF documented Domestic Value Addition reached 32 percent in Year-1 operations and 46 percent in Year-2.

• Project Execution and Site Management

Our turnkey project management delivered 20 months from groundbreaking to first commercial BESS container dispatch, coordinating civil construction, mechanical and electrical erection, ESD-controlled environment fit-out, equipment integration, and phased commissioning across the cell integration, PCS integration, thermal management, and container final assembly zones.

Phased commissioning ran the cell integration hall first (as the highest-value process and the largest workflow), followed by the PCS integration area, then the thermal management and testing zone, then the container final assembly bay, and finally the on-site grid-simulator test bay with UL 9540A validation campaigns.

Multi-vendor coordination across European, Japanese, Korean, and Indian contractors required a 16-strong owner's engineering team supplemented by 8 European resident engineers from the power electronics technology partner during the PCS integration and grid-simulator commissioning phases.

• Compliance, Quality and Sustainability

IMARC led certification readiness across UL 9540 (Energy Storage Systems and Equipment) and UL 9540A (Thermal Runaway Fire Propagation Test) — completed for each container product family by month 18 — IEC 62933 series (Electrical Energy Storage Systems), BIS product certifications aligned with relevant standards and adjacent BESS standards, Central Electricity Authority grid-interconnection technical standards verification for grid-tie performance, ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and ISO 50001:2018 management systems, and utility customer supplier qualification frameworks.

Environmental compliance covered Chhattisgarh Environment Conservation Board Consent to Establish and Operate, Hazardous Waste Authorisation for cell handling and end-of-life battery management under the Battery Waste Management Rules 2022, and Extended Producer Responsibility commitments for the lithium-ion battery lifecycle.

The facility achieved IGBC Gold certification through 2 MW captive rooftop solar covering approximately 22 percent of facility daytime energy demand, 66 percent process water reclamation through closed-loop cooling and cleaning cycles, and 18 percent lower facility energy intensity versus the Southeast Asian BESS integration industry benchmark.

Final Results

Operational Performance

The facility achieved mechanical completion in 20 months with first commercial BESS container dispatch in month 21. Full 2 GWh per annum (100-container) nameplate capacity was reached at 76 percent utilisation by month 18 of operations, with sustained first-pass quality acceptance of 98.4 percent across the container assembly output.

UL 9540A thermal runaway propagation testing was completed across both container product families by month 18, Central Electricity Authority grid-interconnection standards verification was completed by month 16, and successful supplier qualification audits were passed with two central utilities, three renewable energy developers, and one state utility across the first operational year.

Financial Outcomes

Final CapEx of INR 680 Crore delivered 5.6 percent savings against the INR 720 Crore budget through optimised civil packaging, disciplined Indian-fabrication leverage across the structural and thermal management scope, and multi-vendor procurement under the BESS-VGF Domestic Value Addition framework.

BESS-VGF disbursements commenced from Year-1 commercial production against the scheme's milestone structure. Year-2 revenue of INR 1,700 Crore was generated at an EBITDA margin of 9 percent, reflecting BESS integration economics where imported LFP cell cost pass-through dominates the revenue base, with returns driven by high asset turnover rather than per-unit margin, delivering post-tax return on invested capital of approximately 22 percent.

Market Access

Long-term supply commitments were signed with two central utilities and one state utility under respective SECI-anchored BESS tender frameworks and three renewable energy developers deploying solar-plus-storage projects with committed offtake across the Chhattisgarh, Rajasthan, and Gujarat renewable evacuation corridor pipeline.

Export share reached 12 percent of revenue by Year-2 through selective entries into Southeast Asian and Middle East utility BESS markets where Indian-manufactured containers are structurally cost-competitive. The facility positioned itself as a preferred supplier for the growing pipeline of standalone BESS and solar-plus-storage utility projects driven by India's 500 GW non-fossil capacity target and the associated grid balancing requirements.

Sustainability Impact

Our integrated design — combining 2 MW captive rooftop solar covering approximately 22 percent of facility daytime energy demand (with a small demonstration BESS installation using in-house-manufactured product), variable-frequency drives across HVAC and process systems, closed-loop cell integration testing, and LED lighting throughout — achieves 18 percent lower facility energy intensity versus the Southeast Asian BESS integration industry benchmark. Process water reclamation reaches 66 percent through closed-loop cooling and cleaning cycles.

The facility holds IGBC Gold certification and operates structured end-of-life BESS take-back partnerships with the supplied utility customer base under the Battery Waste Management Rules 2022 Extended Producer Responsibility framework, aligning with India's emerging circular economy for lithium-ion battery lifecycle management.

Strategic Impact

The project established a meaningful greenfield grid-scale BESS integration manufacturing capability under the BESS Viability Gap Funding framework, positioned across the fastest-growing structural demand driver in the Indian power sector — grid-scale energy storage supporting renewable energy integration, peak shaving, and system balancing under India's 500 GW non-fossil capacity target by 2030.

Year-2 revenue of INR 1,700 Crore, 46 percent Domestic Value Addition, secured central and state utility supply commitments, and the Phase 2 pathway toward deeper cell-level localisation through the parallel ACC PLI cell manufacturing ramp led the client to approve Phase 2 expansion comprising a second assembly hall and a dedicated behind-the-meter C&I storage product line.

IMARC Engineering's end-to-end EPCM advisory — combining BESS integration engineering, UL 9540A fire safety pathway support, BESS-VGF scheme navigation, CEA grid-interconnection compliance readiness, and disciplined multi-vendor execution — enabled the client to anchor a strategically important Indian industrial asset in a sector where technology complexity, fire-safety rigour, and utility customer qualification requirements had historically raised the entry barrier for first-time BESS integrators.