Battery energy storage (BESS)

Commercial and Utility Scale

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About

Intro – ESS - Enabling Grid Stability in the Energy Transition

The global energy transition is accelerating:

  •  Wind & solar inverter capacity will grow ~3x in the next 5 years (IEA estimate)
  • Conventional power plants are declining, reducing synchronous generators that provide grid inertia
  • Grid stability challenges lead to fluctuating energy prices and higher blackout risks

Why ESS matters:

  • Energy Storage Systems (ESS) and grid-forming inverters are essential to maintain frequency stability, prevent outages, and integrate renewables
  • Therefore, ESS is surging with a projected 5 times increase in installations based on STEPS & NZE targets (IEA estimate), with the majority of new installation being Battery Energy Storge Systems (BESS)
  • Self optimization can reduce electricity bill cost for homes and commercial institutions, and utility scale installations with grid following or grid forming functions support grid stability and renewables energy integration
Infineon’s role

We drive system value and support system differentiation by focusing on power density, system cost saving and reliable subcomponents. We deliver a comprehensive portfolio for next-generation ESS:

Our expertise ensures efficiency, lifetime performance, and cost-effectiveness for a resilient, sustainable energy infrastructure.

Broad segmentation of ESS based on use case/grid connection and power/energy rating

BTM (Behind-the-Meter): Installed on the consumer side of the electricity meter, BTM systems support applications like peak shaving, self-consumption optimization, and backup power. These systems typically prioritize responsiveness, compactness, and integration with residential or commercial energy management systems.

FTM (Front-of-the-Meter): Located on the grid side, FTM systems are designed for utility-scale operations such as frequency regulation, load shifting, and renewable energy integration. They demand higher power ratings, scalability, and grid compliance.

Typical structure of energy storage systems

An energy storage system (ESS) consists of two main components: the Power Conversion System (PCS) and the Battery Management System (BMS).

The PCS converts energy between AC and DC, enabling charging from the grid and discharging back to AC power. Two common PCS architectures are:

  • Central PCS: High-power units (500 kW–2.5 MW) for utility-scale or large commercial projects.
  • String PCS: Modular units (100–300 kW) for scalable, flexible installations.
  • Optional DC-DC optimizers at rack or module level improve efficiency and control.

The BMS ensures battery safety, performance, and longevity through a three-layer structure:

  • BMU: Monitors cells and balances voltage.
  • BCMU: Manages clusters and coordinates protections.
  • BAMU: Oversees the entire array and communicates with site controllers.
  • Key BMS functions include fault detection, SOC/SOH estimation, balancing, and communication via CAN or Ethernet. Additional systems—such as thermal management, fire protection, and site controllers—integrate the ESS into larger energy networks, ensuring compliance with standards.

Most ESS today are battery-based, primarily using lithium-ion technology. The points above apply to Li-ion BESS. For other chemistries or variants—such as redox flow or sodium-ion—different parameters apply. Infineon offers solutions for all these technologies and would be happy to connect if you are interested.

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Intro – ESS - Enabling Grid Stability in the Energy Transition

The global energy transition is accelerating:

  •  Wind & solar inverter capacity will grow ~3x in the next 5 years (IEA estimate)
  • Conventional power plants are declining, reducing synchronous generators that provide grid inertia
  • Grid stability challenges lead to fluctuating energy prices and higher blackout risks

Why ESS matters:

  • Energy Storage Systems (ESS) and grid-forming inverters are essential to maintain frequency stability, prevent outages, and integrate renewables
  • Therefore, ESS is surging with a projected 5 times increase in installations based on STEPS & NZE targets (IEA estimate), with the majority of new installation being Battery Energy Storge Systems (BESS)
  • Self optimization can reduce electricity bill cost for homes and commercial institutions, and utility scale installations with grid following or grid forming functions support grid stability and renewables energy integration

Infineon’s role

We drive system value and support system differentiation by focusing on power density, system cost saving and reliable subcomponents. We deliver a comprehensive portfolio for next-generation ESS:

Our expertise ensures efficiency, lifetime performance, and cost-effectiveness for a resilient, sustainable energy infrastructure.

Broad segmentation of ESS based on use case/grid connection and power/energy rating

BTM (Behind-the-Meter): Installed on the consumer side of the electricity meter, BTM systems support applications like peak shaving, self-consumption optimization, and backup power. These systems typically prioritize responsiveness, compactness, and integration with residential or commercial energy management systems.

FTM (Front-of-the-Meter): Located on the grid side, FTM systems are designed for utility-scale operations such as frequency regulation, load shifting, and renewable energy integration. They demand higher power ratings, scalability, and grid compliance.

Typical structure of energy storage systems

An energy storage system (ESS) consists of two main components: the Power Conversion System (PCS) and the Battery Management System (BMS).

The PCS converts energy between AC and DC, enabling charging from the grid and discharging back to AC power. Two common PCS architectures are:

  • Central PCS: High-power units (500 kW–2.5 MW) for utility-scale or large commercial projects.
  • String PCS: Modular units (100–300 kW) for scalable, flexible installations.
  • Optional DC-DC optimizers at rack or module level improve efficiency and control.

The BMS ensures battery safety, performance, and longevity through a three-layer structure:

  • BMU: Monitors cells and balances voltage.
  • BCMU: Manages clusters and coordinates protections.
  • BAMU: Oversees the entire array and communicates with site controllers.
  • Key BMS functions include fault detection, SOC/SOH estimation, balancing, and communication via CAN or Ethernet. Additional systems—such as thermal management, fire protection, and site controllers—integrate the ESS into larger energy networks, ensuring compliance with standards.

Most ESS today are battery-based, primarily using lithium-ion technology. The points above apply to Li-ion BESS. For other chemistries or variants—such as redox flow or sodium-ion—different parameters apply. Infineon offers solutions for all these technologies and would be happy to connect if you are interested.

Contact form

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