Why 70% of BESS systems fail to deliver a return on investment (and how to avoid this)
In an increasingly challenging energy landscape, energy storage is emerging as a strategic asset for industrial sites.
Many companies have already taken the plunge by installing battery energy storage systems (BESS) to safeguard their operations and control costs.
But one reality is still too often underestimated:
installing a BESS does not guarantee its performance.
Today, a large proportion of projects fail to deliver the expected return on investment, not because of the technology… but because of how it is used.
A finding from the field: high-performance systems… underutilised
In practice, the picture is clear: BESS systems are installed but rarely used, usage strategies are non-existent or vague, and performance falls short of initial projections.
The result: high-performance technology… that fails to realise its full potential.
It is currently estimated that nearly 70% of projects are oversized or poorly suited to actual usage, proof that proper sizing and management remain key challenges.
The 3 major mistakes that limit performance
1. Insufficient management
A BESS is not a passive piece of equipment.
Without a usage strategy (peak times, off-peak hours, security), it works… but does not optimise anything.
Without management, there is no performance.
2. Inappropriate sizing
Too many projects are designed using a theoretical or standardised approach: overestimated capacity, poorly calibrated power and a poor fit with actual usage. The result: an expensive system… but an ineffective one.
3. A lack of energy monitoring
Once installed, the BESS is often left to run “on its own”, with little monitoring of cycles, no performance analysis and no optimisation over time
Yet a storage system must evolve with the site and its needs.
What really makes the difference
Certain technical parameters are crucial to the performance of a BESS: charge cycles, depth of discharge, thermal management.
These factors directly influence the system’s lifespan, its actual efficiency and, above all… its ROI
The same technology can produce very different results depending on how it is operated.
Same system, opposite results
Let’s take a simple example:
Two industrial sites equipped with a similar BESS.
-The first uses it solely as a backup solution
-The second integrates it into an overall strategy (peak shaving, cost optimisation, smart control)
The result is clear-cut: on the one hand, a poorly profitable investment; on the other, a genuine driver of energy performance
The right approach: think usage before equipment
A high-performing BESS is not just about its technology.
It relies on a holistic approach, a precise analysis of actual needs, bespoke sizing, a tailored operational strategy, and ongoing monitoring and optimisation
It is not the installation that creates value. It is the usage.
Moving from equipment to performance
Energy storage is no longer simply a technical choice.
It is a strategic choice. A BESS must not only function; it must be utilised as a performance lever.
At Sacred Sun Europe, we design storage solutions tailored to industrial realities:
adapted to specific uses, intelligently managed and optimised over the long term.
And you?
Is your storage system truly optimised… or simply installed?
👉 Contact our team for personalised support.