Commercial & Industrial Energy Storage Case Study – 2.15MW/4.19MWh ESS For A Textile Factory Factory Profile - News

MECC has successfully commissioned and delivered a 2.15 MW/4.19 MWh commercial‑industrial energy‑storage station for a local textile factory. This marks large‑scale project implementation and closed‑loop commercial verification of MECC's C&I energy‑storage technology, delivering a replicable green decarbonization reference for manufacturing‑sector energy transition.

As a continuous‑process manufacturer, the textile factory operates round‑the‑clock shift production. It is equipped with high‑power spinning, weaving and dyeing equipment with heavy fluctuating loads, which places high requirements on power‑supply reliability. The existing power‑distribution facilities including transformers and low‑voltage switchgears have been in service for years. Constraints such as limited available on‑site space, combustible textile dust and complex traffic routes make it a typical retrofitting project for legacy industrial plants.

Pain Point Analysis

High electricity expenditure

The plant is subject to two‑part time‑of‑use industrial tariffs with large price gaps between valley and peak hours. During grid‑stress periods, peak‑hour electricity costs surge significantly. Round‑the‑clock production keeps transformer demand at high levels, resulting in considerable maximum‑demand charges in addition to high peak‑period energy bills. Cost uncertainty brings heavy pressure to operational profit.

Unstable power supply

Under tight grid conditions, load‑shedding may occur and cause sudden power outages. For textile continuous‑flow production, unexpected shutdown will damage semi‑finished yarn and dyeing products, cause equipment re‑commissioning loss and delay customer orders, bringing substantial direct economic losses.

Extensive energy management

Before the retrofit, the factory lacked a comprehensive energy‑monitoring system. Managers could only read total incoming meter data without visibility of power consumption per workshop or individual equipment. It was difficult to pinpoint high‑energy‑consumption processes and implement targeted energy‑saving measures, leading to severe energy waste.

On‑site Construction Challenges & Technical Solutions

This is a brown‑field retrofit rather than a green‑field project. Two major practical obstacles frequently encountered in large manufacturing‑plant ESS projects were addressed during site implementation.

Challenge 1: Limited available land on legacy factory site plus strict fire‑safety requirements for dust‑prone Class‑C textile workshops

The textile factory has high land‑utilization rate. Most premises are occupied by production workshops, raw‑material and finished‑goods warehouses with very limited vacant ground. The large‑size energy‑storage containers impose strict requirements on road bearing capacity, hoisting space and foundation conditions. Textile workshops generate cotton fiber and fabric dust, classified as Class‑C fire‑hazard locations. Containers shall maintain safe separation distances from combustible stock, meanwhile reserving space for transportation, crane lifting and maintenance. Dust ingress may block heat‑dissipation channels, accelerate component aging and raise thermal‑runaway risks. Improper layout will result in failure to pass fire‑safety and grid‑connection acceptance.

Solutions

MECC engineering teams performed multiple site surveys to verify road load‑bearing capacity, turning radius and foundation bearing capability. The final container location is selected on hardened open ground adjacent to the 10 kV power‑distribution room. This shortens high‑voltage cable routing and maintains code‑compliant fire‑safety spacing away from production buildings and combustible warehouses, with reserved lanes for container hoisting and routine maintenance.

Industrial‑grade energy‑storage containers with enhanced sealing performance are adopted to reduce dust intrusion. The internal closed liquid‑cooling circulation system avoids drawing dust‑laden ambient air, fundamentally preventing radiator blockage caused by textile fibers.

Each container integrates battery modules, BMS, PCS, fire‑protection and thermal management units. A multi‑level fire‑protection system including cell‑level aerosol suppression, multi‑sensors for temperature, smoke and combustible‑gas detection is integrated, together with interlock logics for alarm, ventilation and high‑voltage disconnection. Fire‑protection parameters are configured according to Class‑C workshop specifications, completing simulation and on‑site acceptance tests to satisfy local fire‑safety and grid‑connection regulations.

Challenge 2: High‑power bidirectional charge‑discharge of dual container clusters may induce impact and voltage fluctuation on legacy transformers and busbars; short‑circuit‑capacity matching risks

Existing transformers and switchgears were not originally designed for frequent large‑power bidirectional energy‑storage operation. Joint operation of two large‑capacity containers delivers total power up to 2.15 MW. Rapid power swing between charging and discharging could generate impact on legacy power‑distribution assets, trigger bus‑voltage fluctuation and interfere with sensitive textile motors and dyeing automation equipment. Short‑circuit capacity must be carefully checked to ensure fault current from ESS will not exceed withstand limits of original switchgears.

Solutions

Detailed power‑system simulation and calculation were completed in the design phase. Impedance parameters of factory transformers and short‑circuit capacity of busbars were fully modelled and verified, to guarantee that ESS fault short‑circuit current stays within equipment withstand thresholds and protects legacy distribution hardware.

The MECC Energy Management System (EMS) implements cluster coordinated control for two energy‑storage containers. Ramp‑rate limits are enforced for total charge‑discharge power. Power will rise and fall smoothly instead of instant full‑scale switching, whether for TOU arbitrage, demand management or off‑grid backup mode. This suppresses voltage impact caused by abrupt power variation and secures stable operation of production machinery. SOC equalization between two containers is realized to extend overall system service life.

The EMS continuously monitors transformer loading rate and bus voltage. When approaching safety thresholds, it actively caps maximum input/output power of the whole ESS cluster, giving priority to the safety of factory's original power‑distribution network and realizing friendly interoperation between container‑based energy‑storage cluster and legacy industrial grid.

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C&I Energy‑storage Solution

Solution Architecture

The project adopts a 2.15 MW/4.19 MWh energy‑storage system, consisting of two sets of 1 MW/2 MWh energy‑storage containers and one set of 2500 kVA step‑up transformer system.

Each container integrates lithium‑ion battery modules, BMS, PCS, fire‑protection system and thermal‑management system. The MECC EMS platform conducts unified cluster scheduling for two containers, supporting one‑stop monitoring and centralized charge‑discharge management for the whole power station.

The overall system efficiency reaches ≥88 %, cycle life exceeds 8 000 cycles with maximum discharge rate ≤0.5 C, satisfying heavy‑duty industrial‑grade operation requirements.

Time‑of‑Use Arbitrage

Charge at low‑cost valley‑hour electricity and discharge during high‑price peak hours to shift factory peak load. Valley‑time charging plus peak‑time discharging brings economic benefits for asset owner while realizing peak‑valley load shifting.

Demand Management

For users under two‑part tariff, the system monitors real‑time transformer power. When approaching contracted demand limit, ESS discharges automatically to reduce transformer output and cut maximum‑demand charges.

Distribution Capacity Augmentation

When short‑term production load exceeds existing transformer capacity, energy‑storage provides fast power supplement, avoiding costly transformer upgrade and long construction cycle.

Demand‑Side Response

During grid‑stress periods, the factory can reduce grid power draw via ESS to participate in demand‑side response programs and obtain financial incentives while supporting grid stability.

Project Outcomes

TOU Arbitrage Revenue

Stable continuous production enables more than 2 charge‑discharge cycles over 290 operational days per year. Annual arbitrage revenue is calculated at 510 000 yuan.

Demand‑Side Response Income

Additional revenue can be obtained by participating in local power‑market demand‑response programs.

Power‑Supply Security

The energy‑storage station serves as emergency backup power source. Upon utility‑grid outage, seamless mode‑switch keeps critical production equipment running, preventing production halt, material scrap and order delay losses.

Cumulative Return

Over a 12‑year operational lifecycle, cumulative revenue from TOU arbitrage and demand‑side response can reach 7.68 million yuan.

The project fully demonstrates the economic and energy‑structure‑optimization value of C&I energy storage and establishes a replicable profit‑mode benchmark for manufacturing industries. In addition, the EMS platform collects comprehensive plant‑wide energy‑consumption and ESS operational data, enabling managers to analyze energy‑intensive production processes and achieve refined factory energy management.

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