1001 Smart Cities
🇯🇵 Yokohama

Tsunashima Sustainable Smart Town

🤖 AI-generated summary of the sources below · 🔎 Last verified · ◆ 7 sourced claims, none individually verified yet

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page

✎ Corrected 22 Aug 2026 2 sources added. · 3 revisions in all What changed →

Panasonic and Nomura Real Estate Development built Tsunashima Sustainable Smart Town on a former Panasonic factory site in Kohoku ward, Yokohama, and it entered operation on 26 March 2018. A hydrogen refuelling station opened on the site, and flats are fitted with a screen-based home control system that lets residents follow their own water and energy use. Unlike the Sustainable Smart Town in Fujisawa, whose consortium Panasonic Group represents and which describes itself as built around residents' actual lifestyles rather than technology-driven infrastructure, Tsunashima is primarily a commercial development aimed at collaboration between the companies on site.

Live 📅 since 2018
Outcome🔄 Ongoing
Evidence🏛️ Officialgrades the sourcing — this entry states no impact figure
what does this mean?The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →
Run byTsunashima SST Council, led by Panasonic and Nomura Real Estate Development
Scale🏘️ District

🎓 Lesson

Two Sustainable Smart Towns with the same lead company and a different customer: Fujisawa is organised around how residents live, Tsunashima around companies working alongside each other — and which of the two a technology stack answers to is what determines who keeps paying for it.

⚡ EnergySmart districtsHydrogenSensors & IoT

📅 How old is the evidence?

Two clocks, kept apart: when this entry’s sources were published, and what has happened to its record in the atlas. Documented span: since 2018. 3 of 5 sources carry a publication date, from 29 March 2017 to 14 April 2022.

When the sources were published

  1. Panasonic · vendorPanasonic Newsroom — hydrogen station at Tsunashima SST opens
  2. Keio University · researchKeio University — completion of Tsunashima Sustainable Smart Town
  3. Panasonic · vendorPanasonic Newsroom — Pioneering the Future at Tsunashima Sustainable Smart Town

Every source, with links ↑

What happened to this record

  1. Entered the record
  2. Sources last read
  3. Publication date recorded for 3 sources
  4. Publication date recorded for 3 sources
  5. 2 sources added

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 7 claims with their sources · the forensic record

Evidence Passport · public beta 7 addressable claims, 5 source dossiers, one permanent baseline. The passport is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.

Inspect the claims, one by one — verbatim text, sources and caveats for all 7

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-cd1728c678541a86 descriptive
Panasonic and Nomura Real Estate Development built Tsunashima Sustainable Smart Town on a former Panasonic factory site in Kohoku ward, Yokohama
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Both sources place the town on the former Panasonic factory site in Tsunashima-Higashi, Kohoku-ku, Yokohama, and name Panasonic and Nomura Real Estate Development as lead organisers of the Tsunashima SST Council.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Keio University — completion of Tsunashima Sustainable Smart Town
  2. Panasonic Newsroom — Pioneering the Future at Tsunashima Sustainable Smart Town
Claim 2 clm-158caf075849c06f quantitative
it entered operation on 26 March 2018
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Keio University's announcement of the town's completion gives 26 March 2018 as the start of the operational phase.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Keio University — completion of Tsunashima Sustainable Smart Town
Claim 3 clm-c7dd05baf632fd90 descriptive
A hydrogen refuelling station opened on the site
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Panasonic's newsroom announces the opening of a hydrogen station at Tsunashima Sustainable Smart Town.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Panasonic Newsroom — hydrogen station at Tsunashima SST opens
Claim 4 clm-3b87124bcecd1c2a descriptive
flats are fitted with a screen-based home control system that lets residents follow their own water and energy use
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Panasonic describes apartments whose intercom and appliance operation is integrated in a screen-based home control system using IoT, and states the system also allows residents to track their water and energy usage.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Panasonic Newsroom — Pioneering the Future at Tsunashima Sustainable Smart Town
Claim 5 clm-97008442f6299c82 descriptive
whose consortium Panasonic Group represents
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Fujisawa SST Consortium's own project-organizations page lists its membership by tier and names 'Representative Member Panasonic Group' at the top, ahead of the Full Member A tier that includes Panasonic Homes Corporation, Mitsui Fudosan and Tokyo Gas.
Caveat
Representative member of a consortium is not the same as ownership; the town is run by the Fujisawa SST Management Company, and the page lists more than twenty other member companies.

Sources carrying this claim

  1. Fujisawa SST — Project organizations (operator)
Claim 6 clm-362cd3b2b6cb447d descriptive
built around residents' actual lifestyles rather than technology-driven infrastructure
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The town's own concept page describes Fujisawa SST as continuing 'to develop as a town energizing people's lives based on residents' actual lifestyles, rather than focusing on technology-driven infrastructure'.
Caveat
This is how the town describes itself; no independent assessment of the claim appears among the sources of this entry.

Sources carrying this claim

  1. Fujisawa SST — Town concept (operator)
Claim 7 clm-76b8bd211fdfd941 descriptive
Tsunashima is primarily a commercial development aimed at collaboration between the companies on site
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Panasonic contrasts Tsunashima with the Fujisawa and Suita towns: those are planned as residential communities, while Tsunashima is primarily a commercial venture meant to nurture collaborative innovation among companies.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Panasonic Newsroom — Pioneering the Future at Tsunashima Sustainable Smart Town
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-08-22-cross-city-sourcing effective 2026-08-18 · created 2026-08-22

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:eb338081f930f6a66de57e1614b920736a3774547fc57b522bddc25102207ddc
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
7
of 7 claims mapped
5
source dossiers
3
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Tsunashima SST Council, led by Panasonic and Nomura Real Estate Development
Actor types
private
Funding model
private
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

5 source dossiers

Keio University — completion of Tsunashima Sustainable Smart Town keio.ac.jp · 2 linked claims

Open original source ↗

Stable source ID
src-048a362449e5444e
Publisher
Name not classified · keio.ac.jp
Type / language
web-page · language not classified
Published
2018-04-06
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-18
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
No locator recordedDescriptive only — not page/paragraph exact
Claims linked
Panasonic Newsroom — Pioneering the Future at Tsunashima Sustainable Smart Town news.panasonic.com · 3 linked claims

Open original source ↗

Stable source ID
src-1e02fc00f5bbad18
Publisher
Name not classified · news.panasonic.com
Type / language
web-page · language not classified
Published
2022-04-14
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-18
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
No locator recordedDescriptive only — not page/paragraph exact
Claims linked
Panasonic Newsroom — hydrogen station at Tsunashima SST opens news.panasonic.com · 1 linked claim

Open original source ↗

Stable source ID
src-83421cccef81d069
Publisher
Name not classified · news.panasonic.com
Type / language
web-page · language not classified
Published
2017-03-29
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-18
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
No locator recordedDescriptive only — not page/paragraph exact
Claims linked
Fujisawa SST — Town concept (operator) fujisawasst.com · 1 linked claim

Open original source ↗

Stable source ID
src-9bc2bae8d34d9f3e
Publisher
Name not classified · fujisawasst.com
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-18
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
No locator recordedDescriptive only — not page/paragraph exact
Claims linked
Fujisawa SST — Project organizations (operator) fujisawasst.com · 1 linked claim

Open original source ↗

Stable source ID
src-dac8352e4b2b404c
Publisher
Name not classified · fujisawasst.com
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-18
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
No locator recordedDescriptive only — not page/paragraph exact
Claims linked
Known limits of this passport
  • Publisher names and source languages have not yet been classified; domains are recorded without guessing.
  • Existing source notes are descriptive locators, not page- or paragraph-exact citations.
  • A missing archive, publication date or content hash is shown as null rather than inferred.
  • The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.

Continue exploring

Compare this project

🇯🇵 Fujisawa Sustainable Smart Town · Fujisawa Same developer, seven kilometres apart: Fujisawa sells residents a way of living, Tsunashima sells companies a place to test one. 🇩🇪 Siemensstadt Square (Siemensstadt 2.0) · Berlin A manufacturer redeveloping its own former factory site into a district it also supplies with technology. 🇯🇵 Yokohama Smart City Project (YSCP) · Yokohama The demonstration ended without an outcome figure; what was built afterwards is private and answers to its companies, not the city.

Explore the wider context

📟 A Reading Is Not a Decision🏘️ Smart districts guide🏙️ Yokohama city profile⚡ Energy projects📖 Adaptive traffic signals📖 Air quality index (AQI)📖 Automated speed enforcement (speed cameras)
📎 Cite this project

1001 Smart Cities (2026). “Tsunashima Sustainable Smart Town” — Yokohama, Japan. The Smart City Atlas. https://1001smartcities.org/projects/yokohama-tsunashima-sst/ (last verified 2026-08-18). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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