As solar and wind supply a growing share of the world's electricity, power systems are losing the large rotating generators that once set grid frequency and voltage. Battery energy storage systems (BESS) are increasingly expected to help fill that gap, and the technology that makes it possible — grid-forming control — is moving from a niche feature to a mainstream specification. For international B2B buyers, EPCs and project developers, understanding why grid-forming matters is now part of choosing the right storage system.
Grid-forming (GFM) technology describes the ability of an inverter-based resource to actively establish and regulate grid voltage and frequency, rather than simply following a signal created elsewhere on the network. A grid-forming inverter behaves in a way that resembles a controllable voltage source: it can set the voltage waveform and, through its control software, contribute inertia and fast frequency response. This is a fundamental departure from conventional inverter behaviour, and it moves a BESS closer to the role historically played by synchronous generators.
Most inverters deployed today are grid-following. They measure the existing grid voltage and frequency and inject current in phase with it — an approach that works well on a grid dominated by synchronous machines. Grid-forming inverters, by contrast, create their own voltage reference and can operate even where no external reference exists, a property that matters on weak grids, in islanded systems and for black start.
| Aspect | Grid-Following | Grid-Forming |
|---|---|---|
| Reference | Follows existing grid voltage and frequency | Establishes its own voltage/frequency reference |
| Behaviour | Current source | Voltage source |
| Inertia contribution | Limited | Can provide synthetic inertia |
| Black start | Typically not available | Possible |
| Best suited to | Strong, conventional grids | Weak grids and high-renewable systems |
Solar PV and wind do not provide the same physical inertia as heavy rotating turbines. As thermal plants retire, the system has less natural resistance to frequency and voltage disturbances. This can appear as faster frequency changes, weaker voltage support and a higher risk of instability, particularly where renewable penetration is high. Grid-forming capability is one of the tools that can restore some of the missing system strength.
A grid-forming BESS can offer more than energy shifting. Depending on the system design and the applicable grid code, capabilities may include synthetic inertia, fast frequency response, voltage and reactive power support, oscillation damping, islanded operation and black start. Together, these functions turn a battery asset from a simple energy store into grid infrastructure that helps support the network itself.
Regulators and system operators are beginning to formalise these expectations. In India, the Central Electricity Authority (CEA) issued a request on 3 February 2026 to all grid-forming inverter manufacturers, asking them to share details of their manufacturing capacity. CEA deputy director Veepin Kumar wrote that the growing share of solar and wind "necessitate the installation of grid-forming inverters to make the electricity grid stable and reliable," and asked for information on inverter sizes from 10 kW to 1 MW and above, along with indicative manufacturing costs in India (Energy-Storage.News, 20 February 2026).
In Germany, the four transmission system operators — 50Hertz, Amprion, TenneT and TransnetBW — began procuring inertia services on 22 January 2026 under a fixed-price, megawatt-based model, with the first contract period running to January 2028. Grid-forming BESS is among the technologies expected to provide this "instantaneous reserve," helping keep frequency within a 0.2 Hz band around 50 Hz (Energy-Storage.News, 27 January 2026).
These developments are national policy and market signals rather than a single unified global standard, and requirements differ from market to market. They do, however, show the direction of travel: grid-forming capability is moving from an optional feature to a specification item.
Because "grid-forming" can mean different things in different datasheets, buyers should look beyond the label. Practical checks include:
Datasheet capability and project-ready performance are not the same thing. As one power-electronics supplier noted in a 2026 technical article, a PCS may list grid-forming control while the real project still has to pass grid studies and demonstrate the expected behaviour on site (Energy-Storage.News, 16 September 2026).
Analysts now list grid-forming among the defining storage trends of 2026. Wood Mackenzie's 2026 energy storage predictions identify grid-forming, alongside hybrid systems and alternative chemistries, as an area to watch (Energy-Storage.News, 27 January 2026). As more markets introduce stability-focused procurement and connection rules, grid-forming capability is likely to influence both bankability and long-term asset value. Suppliers such as TIANON are positioning themselves within this shift by offering new-energy and energy-storage solutions designed to keep pace with evolving grid requirements.
Grid-forming technology is becoming more important because renewable-rich grids need services that conventional inverters cannot easily provide. For B2B buyers, the practical takeaway is to treat grid-forming capability as both a technical and a commercial decision, to verify it against local grid codes, and to choose partners who can support the full project lifecycle — not just supply hardware.
