Store and manage your energy for greater energy flexibility, competitiveness, and resilience
In a complex geopolitical environment marked by high electricity price volatility, growing grid constraints, and an accelerating energy transition, businesses must go beyond simply generating energy.
The real challenge now becomes: how do you intelligently optimize, monetize, and manage the energy available on site?
BESS – Battery Energy Storage System is emerging as a strategic lever for competitiveness for players in the C&I (Commercial & Industrial) sector and for local governments.
By making it possible to decouple generation and consumption, storage turns energy into a controllable asset that creates both economic and environmental value.
Combined with energy efficiency, solar generation, and intelligent management (EMS) solutions, it becomes the cornerstone of a high-performing energy strategy.
How does a BESS energy storage solution work?
An energy storage solution (BESS) works as an intelligent system capable of capturing, storing, and delivering electricity at the most opportune moment. In practical terms, the energy generated — for example through solar panels or the grid — is converted and stored in batteries. At the heart of the system, an energy management system (EMS) manages all of the site’s energy flows in real time. It simultaneously orchestrates consumption, solar generation, storage, market prices, grid constraints, and weather conditions. Based on these parameters, it automatically decides whether it is best to store the energy, use it immediately, or feed it back into the grid.
This intelligence is enhanced by the integration of advanced algorithms and artificial intelligence, which can anticipate energy needs, forecast generation and price fluctuations, and then determine the best decisions. The system thus continuously optimizes the site’s operation, adjusting its choices in real time. When demand rises or prices climb higher, the stored energy is delivered strategically to power the site or maximize its value.
The BESS thus becomes a true energy conductor: it no longer just stores energy — it anticipates, decides, and optimizes, making it possible to synchronize generation and consumption, improve independence, and get the most out of every kWh.
Why deploy energy storage systems (BESS)?
By combining energy efficiency + solar generation + BESS storage + intelligent management
A C&I client can:
- Cover up to 50% of its electricity needs
- Reduce its bill by at least 20%
- Gain energy independence and flexibility
GreenYellow then becomes its energy shield.
Maximize the value of the energy produced on site
In practice, solar generation and an industrial site’s needs are not synchronized.
Storage therefore makes it possible to regain control over when energy is used:
- Store the electricity produced during the day to use it later
- Significantly increase the self-consumption rate (up to 40–60%)
- Avoid immediately reselling energy at a low price
Result: every kWh produced is used at the best moment, and therefore better monetized.
Reduce costs and better control your bill
A BESS acts directly on energy expenses:
- Less electricity purchased from the grid
- Protection against price increases and volatility
- Reduction of power peaks (peak shaving)
The payoff: a more stable, more predictable, and optimized bill.
Strengthen energy independence and resilience
Storage strengthens the site’s energy security:
- Less dependence on the electricity grid
- Secured supply in the event of a disruption
- Better control over your supply
Energy becomes a performance lever, not a risk.
Bring flexibility to the electricity system
The BESS benefits not only your site: it also contributes to a smarter electricity system.
- Fine-tuned management of energy flows
- Participation in grid balancing
- Easier integration of renewable energy
Storage becomes a true flexibility tool, at the heart of the energy transition.
Energy storage: the key to intelligent management
Energy storage is the essential building block that makes it possible to move from a traditional logic — where energy is generated and consumed instantly — to a much more advanced approach based on intelligent management.
Indeed, without storage, a site is subject both to the variability of its generation (particularly renewable) and to grid or price constraints, with no room for arbitrage.
Conversely, a storage system (BESS) introduces decisive flexibility:
it makes it possible to retain energy, shift it over time, and choose precisely when and how to use it, according to operational needs or economic opportunities. Energy is then no longer a flow that is simply endured but a strategic resource that can be managed and optimized.
This capability paves the way for intelligent energy systems, able to anticipate, arbitrate, and adapt in real time, making storage a central lever for performance, resilience, and the energy transition.
Key use cases
Injection réseau optimisée
Le stockage énergétique permet de différer l’injection d’électricité vers le réseau pour la réaliser lorsque les conditions sont plus favorables.
Résultat :
meilleure valorisation de l’énergie produite et contribution à l’équilibre du réseau.
Autoconsommation optimisée | Hybridation PV + BESS
Le stockage permet de conserver l’énergie solaire produite en journée pour l’utiliser plus tard, lorsque les besoins sont plus élevés.
Résultat :
moins d’énergie injectée à bas prix et un taux d’autoconsommation fortement amélioré.
Peak shaving (réduction des pics de puissance)
Le BESS fournit de l’énergie lors des pointes de consommation afin de limiter la puissance appelée sur le réseau.
Résultat :
baisse des coûts liés aux pics et meilleure maîtrise de la facture énergétique.
Load shifting (déplacement des consommations)
L’énergie est stockée lorsque les prix sont bas ou la demande faible, puis utilisée lors des périodes plus coûteuses.
Résultat :
optimisation des coûts en consommant au moment le plus avantageux.
Backup énergétique
En cas de coupure ou de perturbation du réseau, le système de stockage prend le relais pour alimenter les équipements critiques.
Résultat :
continuité d’activité et sécurisation des opérations.
Energy trading / arbitrage marché
Le stockage permet d’acheter de l’électricité lorsque les prix sont bas et de la revendre ou consommer lorsque les prix augmentent.
Résultat :
génération de revenus complémentaires et optimisation dynamique des coûts énergétiques.
Services au réseau (flexibilité, fréquence, capacité)
Le BESS peut être mobilisé pour fournir des services au réseau électrique (réglage de fréquence, réserve, effacement).
Résultat :
nouvelles sources de revenus tout en contribuant à la stabilité du réseau.
Microgrid / sites isolés
Couplé à des moyens de production locaux (solaire, groupe électrogène), le stockage permet de gérer un réseau électrique autonome.
Résultat :
indépendance énergétique accrue et sécurisation de l’alimentation, même en zone isolée.
Optimisation multi-usages (multi-assets)
Le stockage peut être utilisé simultanément pour plusieurs objectifs : autoconsommation, peak shaving, trading ou services réseau.
Résultat :
maximisation de la rentabilité en combinant plusieurs leviers de valorisation.
BESS: The heart of the integrated energy ecosystem
Storage is no longer a standalone product; it is becoming the backbone of a comprehensive energy ecosystem.
GreenYellow is developing several value chains centred on battery storage systems:
- Decentralised solar power for grid feed-in or self-consumption + BESS
- Energy efficiency + BESS
- PV + BESS + energy trading
- BESS standalone
A modular and bespoke approach, tailored to each client.
Proven performance
- 1,500 CPE or UaaS contracts
- 1,350 photovoltaic power plants under supervision
- 100,000 variables analysed every 5 minutes
- 30,000 events handled per year
- 98.5 % per cent uptime
The challenge: to maximise energy value and ensure reliable results.
GreenYellow is developing several value chains centred on battery storage systems:
- Decentralised solar power for grid feed-in or self-consumption + BESS
- Energy efficiency + BESS
- PV + BESS + energy trading
- BESS standalone
A modular and bespoke approach, tailored to each client.
Proven performance
- 1,500 CPE or UaaS contracts
- 1,350 photovoltaic power plants under supervision
- 100,000 variables analysed every 5 minutes
- 30,000 events handled per year
- 98.5 % per cent uptime
The challenge: to maximise energy value and ensure reliable results.
The Energy-as-a-Service model: performance without investment (ESCO)
With GreenYellow:
€0 CAPEX (financing provided by GreenYellow)
Operation and maintenance included
Risks transferred
Performance commitment
- 3 500 Energy-as-a-Service (EPC – UaaS) contracts delivered since 2007
- 1 500 Energy-as-a-Service contracts (EPC – UaaS) currently in operation
- 1,350 photovoltaic power plants under supervision
- 100,000 variables analysed every 5 minutes
- 30,000 incidents/alerts reported and dealt with each year
- 98.5 % per cent uptime
You pay for a result, not for equipment.
Performance commitment
- 1,500 CPE or UaaS contracts currently in operation
- 1,350 photovoltaic power plants under supervision
- 100,000 variables analysed every 5 minutes
- 30,000 incidents/alerts reported and dealt with each year
- 98.5 % per cent uptime
You pay for a result, not for equipment.
GreenYellow positions itself as a leading partner in managing energy flexibility, offering a comprehensive and integrated approach.
GreenYellow positions itself as a leading partner in managing energy flexibility, offering a comprehensive and integrated approach.
From design through to operation, the company draws on its expertise in the sizing, financing, installation and integration of BESS and EMS solutions to ensure high-performance systems that are tailored to the specific challenges of each site.
GreenYellow’s advantages
A key player in the decentralised energy transition since 2007
Expertise in multi-site and complex sites
Comprehensive, value-adding energy solutions (efficiency + solar + storage + trading),
An integrated approach and a contract that is 100 per cent funded and risk-free
Advanced digital control
Guaranteed performance (> 98.5 per cent uptime)
Guaranteed performance through operational and digital monitoring: 100 per cent of our assets are monitored in real time (over 50 million data points analysed daily) with an availability rate of over 98.5 per cent, ensuring a secure return on investment.
Our Key Figures
MWp
storage capacity
MWh
project opportunities
Discover examples of client projects involving stand-alone BESS systems or solar PV hybrid systems
Read our customer testimonials
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Assess your site’s energy storage and flexibility potential.
Reduce your energy costs, maximise your flexibility and accelerate your transition,
without any initial investment or risk.
Take advantage of a bespoke analysis carried out by our experts to identify
the solution best suited to your business.
