Fingrid will need brand-new wind and solar plants in Finland’s weakest grid locations to supply grid-forming ability, which designers can consult with co-located batteries sized at as much as 30% of plant output.
Finnish transmission system operator Fingrid has actually released technical requirements requiring brand-new big wind and solar plants in converter-dominated parts of its network to offer grid-forming control, either through their own inverters or through different devices developed at or near the website.
Fingrid revealed the procedure in late Setpember and released the in-depth requirements previously this month, under its VJV2024 grid code for power plants. They use to type D plants linking where the comparable short-circuit ratio (ESCR) at the connection point is listed below 1.0. Existing plants and jobs that currently hold a connection arrangement are exempt.
Wind generation in Finland is focused in such locations, significantly along the west coast, and grid security can be interfered with where there is insufficient concurrent generation, Fingrid stated. Its requirements record states grid-following converters in these locations can trigger inadequately damped voltage oscillations, weak fault ride-through and overvoltages throughout three-phase faults, running the risk of the disconnection of plants at scale, which tuning control criteria alone can’t fix the issue.
Designers can pick in between batteries, energy-storage-equipped fixed simultaneous compensators (ES-STATCOMs) and concurrent makers such as concurrent condensers. Minimum sizing increases as the grid deteriorates. A battery needs to be ranked at ± 10% of the plant’s capability where the ESCR is in between 0.9 and 1.0, ± 20% in between 0.7 and 0.9, and ± 30% listed below 0.7. The comparable limits are 7%, 13% and 20% for an ES-STATCOM, and short-circuit power of 33%, 66% and 100% of plant capability for a simultaneous device.
The devices needs to be online whenever the plant performs at 50% of its ranked output or more, and in service before the plant initially exports power. It needs to sit within 60 km of electrical range from the plant, either inside the plant, at the exact same substation or on the exact same 110 kV line, so that a single fault on Fingrid’s fit together network can not separate the 2.
Batteries set up to fulfill the requirement might sell electrical power and reserve markets, offered that market activity never ever cuts into their minimum supporting ability. A battery offering system services should likewise abide by Fingrid’s storage grid code. One that does not take part in markets can rather be dealt with as an ES-STATCOM and sized at the lower limits.
Fingrid will provide the requirements in a webinar on Oct. 16.
Fingrid currently needs grid-forming ability from big batteries under its storage grid code, and Merus Power’s 30 MW/80 MWh task in Rovaniemi is amongst the systems being developed to that requirement. The 4 Nordic transmission system operators stated in a joint position paper in November 2025 that grid-forming requirements for wind and solar would follow the development of European network codes. India’s Central Electricity Authority has actually individually proposed compulsory grid-forming inverters and co-located storage for brand-new solar and wind tasks.
Matching batteries with wind is not brand-new in Finland. Ilmatar’s 30 MW/41 MWh Ainola battery, co-located with the Piiparinmäki wind farm in North Ostrobothnia, browsed the web in June 2025, when the nation had about 250 MW of battery capability in operation
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