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DayOne Lahti Data Center Campus

PRJ-0018 · Site · Lahti / Kiveriö, Finland

Captured 2026-09-06T04:13:02.721Z · Record last updated 2026-08-22

SHA-256: 5d566b08fe3a001a390035faf626c30c78046d05c23e27284aadd0c828bad700

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Scope and capacity

DayOne began construction of its Kiveriö campus in April 2026. The first building is planned for 50 MW of IT load within a 128 MW potential campus, with TikTok confirmed as principal tenant.

Headline: —

Numbers refer to their stated physical boundaries and are not added together. Source dates, claim dates and record updates have different meanings. Missing dates and locators are not inferred.

Claims and exhibit sources

Current Status · Under construction

actual · DayOne Lahti Data Center Campus (project)

Claim 2240 · Review: Approved · Claim date: Not published

  1. TikTok investoi miljardin Lahden datakeskukseen

    City of Lahti · Document date: 2026-04-10 · Corroborating

    https://www.lahti.fi/uutiset/tiktok-investoi-miljardin-lahden-datakeskukseen/
  2. DayOne data center construction to start in Lahti — SRV strengthens its position

    SRV Group · Document date: 2026-04-07 · Primary

    https://news.cision.com/srv-yhtiot-oyj/r/dayone-data-center-construction-to-start-in-lahti---srv-strengthens-its-position-in-the-growing-mark%2Cc4331404

Site Area · 98,901 square metres

actual · DayOne Lahti Data Center Campus (project)

Claim 2241 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Site Location · Kiveriö; Ilmarisentie 3 / Väinämöisentie 2a

actual · DayOne Lahti Data Center Campus (project)

Claim 2242 · Review: Approved · Claim date: Not published

  1. DayOne data center construction to start in Lahti — SRV strengthens its position

    SRV Group · Document date: 2026-04-07 · Corroborating

    https://news.cision.com/srv-yhtiot-oyj/r/dayone-data-center-construction-to-start-in-lahti---srv-strengthens-its-position-in-the-growing-mark%2Cc4331404
  2. Datakeskuksen rakentamislupa rakennus- ja ympäristölupalautakuntaan

    City of Lahti · Document date: 2025-10-02 · Corroborating

    https://www.lahti.fi/uutiset/datakeskuksen-rakentamislupa-rakennus-ja-ymparistolupalautakuntaan/
  3. A €1.2 billion data centre to be built in Kiveriö, Lahti

    City of Lahti · Document date: 2025-08-14 · Primary

    https://www.lahti.fi/en/news/a-e1-2-billion-data-centre-to-be-built-in-kiverio-lahti/

Planned It Capacity · 50 MW IT

Planned / design or future potential · Lahti first 50 MW building (phase)

Claim 2243 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

Headline treatment: Phase scope; not a whole-site figure

  1. TikTok announces additional €1 Billion investment in Finland

    TikTok · Document date: 2026-04-07 · Corroborating

    https://newsroom.tiktok.com/tiktok-announces-additional-1-billion-investment-in-finland?lang=en-150
  2. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Potential It Capacity · 128 MW IT

Planned / design or future potential · Lahti full campus potential (phase)

Claim 2244 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

Headline treatment: Phase scope; not a whole-site figure

  1. TikTok announces additional €1 Billion investment in Finland

    TikTok · Document date: 2026-04-07 · Corroborating

    https://newsroom.tiktok.com/tiktok-announces-additional-1-billion-investment-in-finland?lang=en-150
  2. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Permit Application Floor Area · 40,000 square metres

reported rounded · Lahti permit and site preparation (phase)

Claim 2245 · Review: Approved · Claim date: 2025-10-02T00:00:00+00:00

  1. Datakeskuksen rakentamislupa rakennus- ja ympäristölupalautakuntaan

    City of Lahti · Document date: 2025-10-02 · Primary

    https://www.lahti.fi/uutiset/datakeskuksen-rakentamislupa-rakennus-ja-ymparistolupalautakuntaan/

Data Hall Storeys · 2 storeys

proposal · Lahti permit and site preparation (phase)

Claim 2246 · Review: Approved · Claim date: 2025-10-02T00:00:00+00:00

  1. Datakeskuksen rakentamislupa rakennus- ja ympäristölupalautakuntaan

    City of Lahti · Document date: 2025-10-02 · Primary

    https://www.lahti.fi/uutiset/datakeskuksen-rakentamislupa-rakennus-ja-ymparistolupalautakuntaan/

Construction Start · Launched immediately after 2026-04-07 contractor announcement

actual · Lahti first 50 MW building (phase)

Claim 2247 · Review: Approved · Claim date: 2026-04-07T00:00:00+00:00

  1. DayOne data center construction to start in Lahti — SRV strengthens its position

    SRV Group · Document date: 2026-04-07 · Primary

    https://news.cision.com/srv-yhtiot-oyj/r/dayone-data-center-construction-to-start-in-lahti---srv-strengthens-its-position-in-the-growing-mark%2Cc4331404

Ready For Service Target · 2027

Planned / design or future potential · Lahti first 50 MW building (phase)

Claim 2248 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne data center construction to start in Lahti — SRV strengthens its position

    SRV Group · Document date: 2026-04-07 · Corroborating

    https://news.cision.com/srv-yhtiot-oyj/r/dayone-data-center-construction-to-start-in-lahti---srv-strengthens-its-position-in-the-growing-mark%2Cc4331404
  2. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Dayone Announced Investment · €1,200,000,000

forecast · DayOne Lahti Data Center Campus (project)

Claim 2249 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland
  2. A €1.2 billion data centre to be built in Kiveriö, Lahti

    City of Lahti · Document date: 2025-08-14 · Corroborating

    https://www.lahti.fi/en/news/a-e1-2-billion-data-centre-to-be-built-in-kiverio-lahti/

Principal Tenant · TikTok

actual · DayOne Lahti Data Center Campus (project)

Claim 2251 · Review: Approved · Claim date: 2026-04-07T00:00:00+00:00 · Supersedes 2250

  1. TikTok investoi miljardin Lahden datakeskukseen

    City of Lahti · Document date: 2026-04-10 · Corroborating

    https://www.lahti.fi/uutiset/tiktok-investoi-miljardin-lahden-datakeskukseen/
  2. TikTok announces additional €1 Billion investment in Finland

    TikTok · Document date: 2026-04-07 · Primary

    https://newsroom.tiktok.com/tiktok-announces-additional-1-billion-investment-in-finland?lang=en-150

Tiktok Announced Investment · €1,000,000,000

transaction scope · DayOne Lahti Data Center Campus (project)

Claim 2252 · Review: Approved · Claim date: 2026-04-07T00:00:00+00:00

  1. TikTok investoi miljardin Lahden datakeskukseen

    City of Lahti · Document date: 2026-04-10 · Corroborating

    https://www.lahti.fi/uutiset/tiktok-investoi-miljardin-lahden-datakeskukseen/
  2. TikTok announces additional €1 Billion investment in Finland

    TikTok · Document date: 2026-04-07 · Primary

    https://newsroom.tiktok.com/tiktok-announces-additional-1-billion-investment-in-finland?lang=en-150

Power Connection Agreement · Executed with Lahti Energy

actual · DayOne Lahti Data Center Campus (project)

Claim 2253 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Grid Connection Contract Value · €38,000,000

transaction scope · DayOne Lahti Data Center Campus (project)

Claim 2254 · Review: Approved · Claim date: 2025-09-12T00:00:00+00:00

  1. Eltel to build grid connections for DayOne's Data Center — contract value EUR 38 million

    Eltel Group · Document date: 2025-09-12 · Primary

    https://www.eltelgroup.com/en/eltel-to-build-grid-connections-for-dayones-data-center-contract-value-eur-38-million/

Grid Connection Completion Target · 2027 Q1

Planned / design or future potential · DayOne Lahti Data Center Campus (project)

Claim 2255 · Review: Approved · Claim date: 2025-09-12T00:00:00+00:00

  1. Eltel to build grid connections for DayOne's Data Center — contract value EUR 38 million

    Eltel Group · Document date: 2025-09-12 · Primary

    https://www.eltelgroup.com/en/eltel-to-build-grid-connections-for-dayones-data-center-contract-value-eur-38-million/

Cooling Design · Air cooled chiller; no freshwater cooling

design · DayOne Lahti Data Center Campus (project)

Claim 2256 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Waste Heat Reuse · Under exploration with local partners

design · DayOne Lahti Data Center Campus (project)

Claim 2257 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland
  2. A €1.2 billion data centre to be built in Kiveriö, Lahti

    City of Lahti · Document date: 2025-08-14 · Corroborating

    https://www.lahti.fi/en/news/a-e1-2-billion-data-centre-to-be-built-in-kiverio-lahti/

Projected Operational Jobs · 100 jobs

forecast · DayOne Lahti Data Center Campus (project)

Claim 2258 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Peak Construction Workers · 1,000 workers

forecast · DayOne Lahti Data Center Campus (project)

Claim 2259 · Review: Approved · Claim date: 2025-08-14T00:00:00+00:00

  1. DayOne announces flagship hyperscale data center project in Lahti, Finland

    DayOne Data Centers · Document date: 2025-08-14 · Primary

    https://dayonedc.com/markets/dayone-announces-flagship-hyperscale-data-center-project-in-lahti-finland

Counterparties and capital

City of Lahti · Government Authority · CMP-0073

DayOne Data Centers · Operator · CMP-0071

Eltel Networks · Contractor · CMP-0077

Kiinteistö Oy Lahden Ilmarisentie 3 · Owner · CMP-0075

Lahti Energy · Utility Provider · CMP-0074

SRV Group Plc · Contractor · CMP-0076

TikTok · Tenant · CMP-0072

Investment Commitment

€1,200,000,000 · 2025-08-14

DayOne aggregate project estimate; no financing sources or spend schedule disclosed.

DayOne Data Centers (Sponsor)

Financing record 16; claim-specific source links appear in the exhibit sources where published.

Investment Commitment

€1,000,000,000 · 2026-04-07

TikTok investment/customer scope; not additive to DayOne's project estimate and not site financing.

TikTok (Sponsor)

Financing record 17; claim-specific source links appear in the exhibit sources where published.

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