Case Study
Energy Savings and TOU Optimization with Rooftop Battery Storage
A high-energy-use factory was facing rising electricity costs from peak demand charges and time-of-use pricing, leading to the rooftop installation of a battery energy storage system to reduce contracted load and optimize energy use for cost savings and grid efficiency.
Project Overview
To address rising energy costs and growing strain on the grid, industrial facilities are turning to battery energy storage systems (BESS) as a strategic tool for managing demand and reducing reliance on peak-hour electricity. In this project, a factory deployed a 125kW / 250kWh rooftop BESS to shift daily energy usage, lower contracted demand, and take advantage of time-of-use pricing. The result: a 28% monthly cost reduction and greater load flexibility. This model offers a replicable approach for manufacturers and utilities aiming to improve energy resilience and economic performance.
Location
Rooftop Installation at a Taiwan Manufacturing Facility
Application
Peak Shaving, Time-of-Use (TOU) Optimization, Load Management
Objective
Installation of BESS to reduce peak demand charges and optimize time-of-use energy consumption.
Battery Capacity
125KW / 250KWh
Product
Power Cabinet 250
Challenge
Solution
Etica deployed a 125 kW / 250 kWh Power Cabinet integrated with its energy management system (EMS) to reduce electricity costs without disrupting operations. The system was programmed to:
Charge during off-peak hours with lower electricity rates
Discharge during peak-rate periods to offset high demand charges
Flatten the factory’s load profile by shifting 400 kWh of daily usage
Operate automatically based on the facility’s energy usage patterns and TOU schedule
This approach enabled the factory to control when and how energy was consumed, without altering production schedules.
Results
The BESS system delivered measurable cost savings and improved energy efficiency:
400 kWh shifted per day, totaling 8,800 kWh per month (based on 22 working days)
NT$34,408/month saved through TOU optimization (~USD$1,075)
NT$6,708/month saved by reducing 30 kW of contracted demand (~USD$210)
Total monthly savings: NT$41,116 (~USD$1,285)
Electricity bill reduced by 28%, from NT$116,584 (~USD$3,640) to NT$83,463 (~USD$2,605)
These savings were achieved without any changes to the factory’s operations, demonstrating the effectiveness of automated load shifting with energy storage.
Products
Fire Safe Energy Storage Solutions
Power Cabinet
Legion C20
Guardian Outdoor
SAFE. EFFICIENT. UNINTERRUPTED.
Keep Your Facility Running, Compliant, and Cost-Effective
Let’s build a battery storage solution that safeguards your operations, cuts energy costs, and meets your uptime demands without the fire risk.
