Finland has 2,057 MW of batteries connected, by Fingrid’s own count, and nobody publishes which they are. Their owners name 457 MW of them, and 1,600 MW more being built.

Fingrid’s count rose 841 MW in 7 months, and four arrivals of 60 MW or more carry 554 MW of it

Fingrid adds a battery to its network model up to a month before it starts, so each step in this line is a battery, or a batch of them, arriving on the grid; it does not say which. The count opened at 1,215 MW on 11 March 2026, the first hour Fingrid published it, and stood at 2,057 MW on 18 October 2026. Between the big steps the line climbs in small ones, many of exactly 1.25 MW, which is the size of one container battery.

Fingrid, dataset 424, “Total installed battery energy storage system capacity”, hourly, read 18 October 2026, CC BY 4.0. Fingrid’s figure counts storage of a megawatt or more, including units expected to connect within about a month, with the distribution grid’s part depending on what the distribution companies document. 3 one-hour readings in which the feed fell to a fraction of the hour before and came straight back are left out as faults in the feed. The dated steps are on the change ledger.

The first reading of each month, as a table

Month	MW, first reading
March 2026	1,215
April 2026	1,269
May 2026	1,284
June 2026	1,427
July 2026	1,614
August 2026	1,614
September 2026	1,848
October 2026	2,013

Fingrid’s count rose 841 MW between 11 March 2026 and 18 October 2026. The owners’ own releases name 121 MW of it, 14%

The count is Fingrid’s register of its own network model. Fingrid says the figure is capacity “added to the network model, most of which are added before production begins”, that it “includes electricity storage facilities that will be put into production within approximately one month”, that it is estimated technical capacity which “does not take into account any capacity restrictions arising from agreements”, and that for batteries on distribution grids it “depends on the documentation provided by the distribution network companies”. The jumps bear that out: every one of the 20 jumps of 5 MW or more landed on a weekday between 07:00 and 18:00 UTC. A jump is a Fingrid entry made somewhere in the month around a battery’s start, at a size Fingrid estimated, so it cannot be read as the hour a battery switched on.

To see how much of the rise has a name, every owner’s, developer’s and builder’s own news pages were read on 18 October 2026 for all 89 batteries on the list, in English and Finnish. Six batteries have a start inside the window on their owners’ own words: Riihimäki, Kaunola (30 MW, March 2026), Callio-Hitura hybrid storage, former Pyhäsalmi mine (4 MW, 1 May 2026), Olana Gunnarsnäs (10 MW, Q3 2026), Olana Koski Tl (7 MW, Q3 2026), Isosuo solar park storage (20 MW, 13 August 2026), Kauhava (50 MW, energised 28 August 2026, still commissioning). Together they are 121 MW of the 841 MW rise. Herrfors storage is on the list as operating with no start date, so it cannot be placed either side of the window. The other 720 MW, 86%, has no name in any release read. Three days carry 488 MW of the rise between them, 121 MW on 1 June 2026, 234 MW on 28 August 2026, 132 MW on 3 September 2026, so the missing part is made of large batteries, and nothing of that size was announced for 2026 by anyone.

Where it may be: 4 batteries being built were due by their owners’ own dates and have passed them with no word that they run, 185 MW in all: Uusnivala BESS (55 MW, due mid 2026), Kotka (50 MW, due 2025), Kalanti BESS (50 MW, due summer 2026), Kellarijanka (30 MW, due July 2026). 6 more are due by the end of this year on the owner’s word, 270 MW: Nivala (70 MW), Simo, phase 2 (70 MW), Isokangas (50 MW), Rautavaara (30 MW), Ristimäki (30 MW), Toppila (20 MW). Any of these could be inside a jump. None of their owners has said so, and this page does not say it for them.

A second authority holds a figure that does not fit either. For 2026 Fingrid reported 244 MW of “energy storage” installed in Finland to ENTSO-E’s transparency platform under the installed-capacity rule, against the 1,050 MW in its own release of February 2026 and the 1,215 MW its dataset showed on 11 March 2026; ENTSO-E’s per-unit register, which lists units of 100 MW and more, holds no Finnish storage unit, which fits. Nothing Fingrid has published reconciles its two figures, and this page does not try to.

Every jump of 5 MW or more, and whether a named battery fits it

Day	Jump, MW	Count after, MW	What the owners’ releases allow
15 October 2026 (2 hours)	+43	2,057	No named battery of this size has a start within two months of it.
24 September 2026	+9.9	2,012	A named battery of this size with a start within two months: Olana Gunnarsnäs, 10 MW, stated Q3 2026. A fit by size and date only.
23 September 2026	+5.4	2,002	No named battery of this size has a start within two months of it.
14 September 2026	+9.99	1,994	A named battery of this size with a start within two months: Olana Gunnarsnäs, 10 MW, stated Q3 2026. A fit by size and date only.
3 September 2026	+132	1,980	No named battery of this size has a start within two months of it.
28 August 2026 (2 hours)	+234	1,848	No named battery of this size has a start within two months of it.
5 June 2026	+17	1,597	No named battery of this size has a start within two months of it.
5 June 2026	+30	1,579	A named battery of this size with a start within two months: Rautavaara, 30 MW, stated 2026; Kellarijanka, 30 MW, stated July 2026. A fit by size and date only.
1 June 2026	+121	1,548	No named battery of this size has a start within two months of it.
29 May 2026	+7.25	1,426	A named battery of this size with a start within two months: Olana Koski Tl, 7 MW, stated Q3 2026. A fit by size and date only.
25 May 2026	+5.75	1,412	No named battery of this size has a start within two months of it.
22 May 2026	+23	1,406	No named battery of this size has a start within two months of it.
22 May 2026 (2 hours)	+12	1,381	No named battery of this size has a start within two months of it.
21 May 2026	+5.15	1,365	No named battery of this size has a start within two months of it.
18 May 2026	+66	1,360	A named battery of this size with a start within two months: Nivala, 70 MW, stated 2026; Simo, phase 2, 70 MW, stated 2026. A fit by size and date only.
13 May 2026	+8.75	1,293	No named battery of this size has a start within two months of it.
23 April 2026	+13	1,284	No named battery of this size has a start within two months of it.
23 March 2026	+9.9	1,269	No named battery of this size has a start within two months of it.
17 March 2026 (2 hours)	+36	1,259	No named battery of this size has a start within two months of it.
11 March 2026	+6.75	1,222	No named battery of this size has a start within two months of it.

A battery fits a jump when its stated size is within a tenth of the jump and its stated start, as the owner gave it, is within two months of the day; Fingrid says it enters a battery up to about a month before it starts, and a distribution-connected one when the distribution company documents it. A fit is a possibility, not a match: two September jumps of 10 MW both fit the one Olana Gunnarsnäs. The 23 steps under 5 MW, 44 MW between them, are left out of the table and in the rise.

Fingrid, dataset 424, read 18 October 2026, and its description of the dataset at data.fingrid.fi (read 18 October 2026). The named batteries and their dates are from the owners’ own releases, each on the battery’s page; the sweep of 18 October 2026 is logged in fi/hand/README.md. ENTSO-E Transparency Platform, installed generation capacity aggregated (14.1.A) and per production unit (14.1.B) for Finland, 2025 and 2026, read 18 October 2026 through its API. Fingrid, release of 24 February 2026, “The combined capacity of electricity storages in Finland now exceeds 1,000 MW”.

Finland’s batteries stand still most of the time: 130 MW moving at any moment, 6% of what Fingrid counts as connected

Fingrid measures the whole fleet’s charging and discharging power every three minutes. Across the 35 full days held, from 11 September 2026, the fleet was charging and discharging 130 MW between them on average, against about 2,005 MW connected, and in 82% of readings its net was within 100 MW of nought. The most it has sent out at once is 673 MW, on 18 September 2026 at 07:33, and the most it has taken in 391 MW, on 21 September 2026 at 14:48. Over a day the fleet discharges about 1,311 MWh, which is about two thirds of a megawatt hour for each megawatt installed: a fleet that is paid to be ready far more than it is paid to move. By the same site’s reading of their meters, British batteries discharge about four times a day and Irish ones about once (the finding).

Fingrid, datasets 399 and 398, the fleet’s charging and discharging power from the real-time measurements in its operation control system, three-minute values, 11 September 2026 to 18 October 2026, CC BY 4.0; the two reads held so far, joined. Fingrid says the series can carry errors from measurements freezing. The bars are the average net power in each hour of the Finnish day: out above the line, in below it. Installed total from dataset 424 over the same days.

The best hour by hour stack paid one megawatt €17,621 in October 2025 and €13,339 in September 2026

Finland’s batteries earn mostly by holding reserve for Fingrid: FCR-N, FCR-D, aFRR and mFRR, each bought in an hourly market whose price and volume Fingrid publishes. The bars are the most one megawatt could have been paid each month with perfect hindsight, choosing the best product every hour, before any cost; a real battery earns less. Over the twelve months to September 2026 that ceiling was €127,090 for the megawatt, of which FCR-N alone would have paid €79,655.

Calculated by Vitreous from Fingrid’s hourly reserve prices and volumes (CC BY 4.0), read 18 October 2026; a price counts only in an hour in which Fingrid bought something. The grey bar is a part month. Energy trading on the day-ahead and intraday markets is not in these figures, because Nord Pool’s prices may not be shown here. Every market, month by month, and how each figure is made.

The markets are filling up: 5.5 megawatts of batteries for every megawatt of upward fast reserve Fingrid bought in October 2026, from 4.0 in March 2026

Fingrid buys a roughly steady amount of upward fast reserve each hour, in FCR-N, FCR-D up and FFR together, while the batteries able to sell it keep arriving. The ratio of its installed battery total to the upward reserve it bought in the same hours is the plainest measure of how crowded the market is getting, and the line only goes one way.

Each month, the average of Fingrid’s installed battery total (dataset 424) divided by the average upward volume it bought in its hourly FCR-N, FCR-D up and FFR markets (datasets 316, 315 and 276) in the same hours. Fingrid, CC BY 4.0. The table of the ratio month by month is on the markets page.

Where the named batteries are

One circle per battery named by its owner, at the place its name carries or the centre of its municipality, sized by power. Yellow operates; blue is being built; pale blue is announced.

83 of 89 batteries placed: 3 at the site itself, from a permit bulletin’s point or OpenStreetMap, the rest from GeoNames because no source gives coordinates; 6 have no municipality in any source and are not drawn. 457 MW operating, 1,600 MW being built, 1,591 MW announced.

Open the Atlas, every battery on the map Every battery, one page each What changed, read by read The system and the batteries, right now

Every battery named as operating

As the owner, developer or builder states it in its own release; the date is the owner’s stated start. Kauhava is energised and commissioning, not yet in commercial operation, and is counted here with the operating batteries. Every figure’s source is on the battery’s page.

Being built

The owners with the most operating

Who builds them

Merus Power is named on 12 of the 89 batteries; the list names a builder, integrator or supplier for 45 of them, and a battery with two firms named counts for each. Nobody names the cell maker: no source read says whose cells are in any Finnish battery.

Where the next batteries are going: 89% of what is being built sits north of the Tampere, Lahti, Lappeenranta line, against 63% of the operating fleet south of it

Fingrid drew the line itself. In February 2026 it said about half of the capacity it counts sits south of Tampere, Lahti and Lappeenranta, and in September 2025 it closed southern Finland to new grid-connected storage until 2029 while pointing to several thousand megawatts of room in Ostrobothnia and the north. The named list, split on that line, shows the pipeline has already moved: of the batteries their owners name as operating, 286 MW sits south of it and 171 MW north; of those being built, 168 MW south and 1,349 MW north; of those announced, 120 MW south and 1,294 MW north. The largest being built are all northern: Haapajärvi (125 MW, Haapajärvi), Tuisku (125 MW, Keminmaa), AKKU One (125 MW, Lapinlahti), Kärppiö / Karppio (125 MW, Teuva), Nala Vuolijoki (125 MW, Kajaani), Kannisto wind farm BESS (125 MW, Halsua).

Each map is the same frame; the dashed line runs through Tampere, Lahti and Lappeenranta, as Fingrid described it, and is drawn straight between them. Batteries placed by GeoNames at the place their name carries or their municipality’s centre; 6 with no municipality in any source are not drawn (261 MW, left out of the shares). Fingrid, releases of 24 February 2026 and 26 September 2025; the list, fi/hand/batteries.csv. No connection capacity by substation is published for Finland, so this page says where the batteries are going and not where room remains.

Fingrid asks for a connection application from 1 MW in three areas: 5 of the operating batteries sit in the two southern ones, 10 of the announced in the Ostrobothnian corridor

From 1 June 2026 a connection-agreement application is needed anywhere in Finland from 2 MW, for consumption, generation and storage. In three areas Fingrid lowers the bar to 1 MW: for storage in a band from Tampere to Jyväskylä and in the Turku corner, and for storage and generation along the Ostrobothnian coast from Vaasa to Oulu. The map is Fingrid’s own, traced from its PDF and fitted to the coast. The zones say when an application must be made, not how much room the grid has, and the edges are as rough as Fingrid drew them. By where this list places them, the two southern storage zones hold 5 operating (53 MW), 1 being built (50 MW) and none announced; the Ostrobothnian corridor holds 1 operating (7 MW), 1 being built (30 MW) and 10 announced (402 MW), the last of them 28% of all the announced megawatts with a place. 27 of the 29 batteries being built with a place are outside all three.

Fingrid, connection-application map valid from 1 June 2026 (liittymissopimushakemus, kartta), read 17 October 2026: the three shapes traced from the PDF’s own vector drawing and placed by fitting Finland’s coast and land border to the map’s image, to within about a kilometre; Fingrid’s edges are themselves rough. Batteries are placed at the place their name carries or their municipality’s centre, so one near an edge may sit on the wrong side. The same zones are shaded on the Atlas, where the list can be filtered by zone. The zones say nothing about where a connection will be granted: Fingrid publishes no capacity by substation.

OpenStreetMap’s volunteers have mapped seven battery sites in Finland: two match a battery its owner named, five are named by no one

No owner publishes coordinates, so until now every point on these maps was a GeoNames place: the centre of a municipality, or a village a battery is named after. OpenStreetMap is a second route. Its volunteers map what they see on the ground, and a battery is tagged as a power plant whose source is a battery, sometimes with its power, its capacity, its operator and the day it started. Asked for every such object inside Finland, the map holds seven sites. One of them, Kauhava, carries the owner and the size the owner’s own releases give, so that battery now sits at the mapped point. One, Elenia Hauho battery, is on the list only because the map holds it, with the size and the start date a mapper tagged; the owner’s own words confirm the battery and name no place. The other five match nothing any owner, builder or permit has said: a site at 60.0704 N, 20.1100 E on Åland, a site at 63.0587 N, 27.7367 E, “Eusniemi”, “Siilinjärvi Energy Storage Linjatie”, “Finalnd 1 Korpikallio - sähköasema & BESS”. The Åland site sits on Kraftnät Åland’s grid, outside Fingrid’s count, whatever it is. The two plants a mapper describes as lithium-ion containers, started in August 2026 and September 2026, are the kind of unit no owner’s release mentions and Fingrid’s February split counted by the hundred. The sizes tagged add to 51 MW across two sites, against the 2,057 MW Fingrid counts, so the map names a sliver of the fleet, and names it to the metre.

OpenStreetMap, every object inside Finland tagged plant:source=battery, generator:source=battery, power=storage or named as a battery store, read 18 October 2026 by fi/tools/osm_batteries.py and re-read with Fingrid’s data twice a week; © OpenStreetMap contributors, ODbL. A tag is what one mapper wrote and dated, so the owner’s own words rank above it wherever both exist; a battery with no size on the map is listed at none. Battery shops, heat stores and place names that merely contain the word are left out. The unmatched sites are hollow rings on the Atlas.

More than 30 GW of storage has asked Fingrid to connect, and southern Finland is closed to new storage until 2029

Finland publishes no list of what is waiting to connect, but Fingrid gives the total. In its release of 26 September 2025 it said it had “more than 30 000 megawatts of energy storage requests for connection to the grid”, which Fingrid puts at about twice Finland’s highest ever consumption, and that it “has already signed contracts to connect energy storage facilities to the grid for around 1 800 megawatts”. Against the 2,057 MW it counts as connected today, about fifteen times the fleet is asking to join it. Fingrid’s webinar on connection applications of 18 May 2026 gives the pace: new storage connection enquiries of 18 GW in 2024 and 26 GW in 2025, 44 GW in the two years, against a system whose highest consumption is under 16 GW; the enquiries are not binding. The same September release continued the stop on new grid-connected storage in southern Finland until 2029, when the Hikiä to Toivila line adds capacity there, and said “several thousand megawatts” of connection capacity remain for storage, above all in Ostrobothnia and northern Finland. The figures are Fingrid’s own, repeated here as it gave them. Fingrid gives totals only, so no project behind them can be named.

Sources: Fingrid, release of 26 September 2025; Fingrid, webinar on connection applications, 18 May 2026, page 5. A request is an enquiry, not a contract, and one project can ask more than once; Fingrid does not say how many projects are behind the figure.

What is not here, and why

Which batteries make up Fingrid’s count, because no Finnish body publishes a unit list; the 1,600 MW the named list does not reach has no name in any owner’s release; Fingrid’s February split put most of what it counted then in units under 2 MW, and the rise since is set out above. What each battery earns, because Fingrid publishes the markets and not the bidders, so the money on this site is for one megawatt and never for a named battery. The day-ahead price, because it is Nord Pool’s and Nord Pool declined permission to show it. Coordinates for most batteries, because no owner publishes them, so a point on the map is a GeoNames place unless a permit bulletin or OpenStreetMap gives the site. The connection queue as a list, because Fingrid publishes enquiries only as the totals above and a map of where new storage may apply. A connection figure is never passed off as a battery’s size.

Sources: Fingrid Oyj open data, data.fingrid.fi, datasets 424 (installed battery capacity), 316 and 317 (FCR-N), 318 and 315 (FCR-D up), 283 and 281 (FCR-D down), 52, 51, 1 and 2 (aFRR), 329, 330, 327 and 328 (mFRR), CC BY 4.0, read 18 October 2026. The named batteries from fi/hand/batteries.csv, kept by hand from owners’, developers’ and builders’ own releases, council decisions and permit bulletins, every fact with its web address, checked against the owners’ own words on 12 October 2026 and read to 18 October 2026. Places from GeoNames, CC BY 4.0, and from OpenStreetMap (ODbL) where a site is mapped. Fingrid’s February 2026 split of its count by size from its release of 24 February 2026. Nothing on this page is modelled.