Battery Energy Storage Systems (BESS) in Bangladesh

As Bangladesh’s industrial and utility scale solar capacity grows, a related technology is becoming just as important to the country’s energy transition: Battery Energy Storage Systems (BESS). While solar panels generate power only during daylight hours, BESS allows that energy to be stored and used exactly when it’s needed, during evening peak demand, grid outages, or periods of low sunlight.

What Is a BESS, and Why Pair It With Solar?

A Battery Energy Storage System stores surplus electricity, whether from solar panels or the grid, in large scale batteries for later use. Paired with a solar installation, a BESS smooths out the mismatch between when solar generates power (daytime) and when many facilities need it most (extended shifts, evening operations, or backup during grid instability). For industrial and telecom sites in Bangladesh, where grid reliability can vary, this pairing is increasingly seen as essential rather than optional.

A Milestone Project: 8.035 MWh at Janata Jute Mills

Cynergy delivered an 8.035 MWh battery energy storage system at Janata Jute Mills, the country’s first large scale battery storage installation of its kind. Paired with the mill’s existing solar capacity, the system allows Janata Jute Mills to store solar energy generated during the day and draw on it during evening shifts or periods of grid instability, significantly reducing the mill’s reliance on diesel backup power.

Where BESS Makes the Biggest Difference in Bangladesh

Three sectors stand out: telecom infrastructure, where BTS towers need uninterrupted power and currently rely heavily on diesel backup generators; manufacturing facilities running multiple shift operations that extend beyond daylight hours; and utility scale solar plants, where storage helps stabilize output fed into the national grid. In each case, BESS reduces dependency on diesel generators, cutting both fuel costs and emissions.

The Cost and Reliability Case

Battery costs have fallen substantially over the past several years, changing the economics of pairing storage with solar. For businesses currently relying on diesel generators for backup power, a BESS paired with solar can offer a cleaner, quieter, and often more cost effective alternative over the system’s lifetime, particularly as grid tariffs and fuel prices continue to rise.

What to Consider Before Investing in BESS

Sizing a battery system correctly requires understanding actual load profiles: how much power is needed, for how long, and during which hours, rather than simply matching battery capacity to solar array size. Getting this wrong leads to either an undersized system that fails during critical periods or an oversized one that adds unnecessary cost. This is why BESS design is typically handled as part of an integrated EPC scope rather than as a standalone add on.

To discuss whether a BESS makes sense for your facility, explore Cynergy’s Battery Energy Storage System solutions or get in touch for a consultation.