1001 Smart Cities
🇯🇵 Yokohama

Yokohama Smart City Project (YSCP)

🤖 AI-generated summary · ◆ 12 sourced claims · 🔎 Last verified

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.

12 sourced claims on this page, none individually verified yet — turn on “Sources in the text” to see each one.

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

✎ Corrected 14 Oct 2026 3 sources added. · 2 revisions in all What changed →

Office buildings cut their peak demand by up to 22.8% when paid enough to do so. The city's own English page about the five-year trial reports none of it.

Outcome🎯 Succeeded
Evidence🏛️ Official
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 byCity of Yokohama with 34 partner companies; succeeded by the Yokohama Smart Business Association (YSBA)
Scale🏙️ City-wide
FundingNational demonstration programme of the Ministry of Economy, Trade and Industry with private partners

Part of 1001 Smart Cities — 1,216 documented projects · 🏙️ 5 more in Yokohama · 🔌 Smart grid & energy guide · ⚡ Energy projects

Japan's trade ministry selected Yokohama in 2010 as a Next-Generation Energy and Social System Demonstration Area, and 34 of the country's leading energy operators, electronics manufacturers and construction companies spent five years testing household energy management, storage and electric vehicles across the city. The demonstration ended in 2014 and the partners were reorganised into a new public-private body, the Yokohama Smart Business Association, to move 'from demonstration to implementation'. The city's own public page on the project publishes no result figures.

Completed 📅 2010–2014

📊 Impact

In the summer 2013 building trial, 14 buildings, factories and apartment blocks cut peak demand by up to 22.8% against a target of up to 20%; the city measured it by randomly splitting the participants on each event day into a group asked to save and a group that was not. Demand response showed an effect only at incentives of 15 yen/kWh or more. A household trial the same summer, with about 1,900 homes on a higher afternoon price, cut peak demand by up to 15.2%, according to the city's project division.

🎓 Lesson

The trials show that demand response works when the price is high enough, and that buildings respond more reliably than homes; they also show that results survive only where someone keeps them published. The figures sit in 2013 press releases and trade-press reports in Japanese, while the city's English project page, the one a foreign reader finds, reports none of them.

⚡ EnergySmart grid & energySensors & IoTSolar & PV

Sources

↗ City of Yokohama — Yokohama Smart City Project (YSCP)Updated 19 August 2026The city's English project page: METI designation in 2010, demonstration 2010–2014 with 34 companies, and the Yokohama Smart Business Association founded in 2015 to move 'from demonstration to implementation'; it gives no result figures.
↗ NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)Summary of the city's press release on the summer 2013 building demand-response trial: 14 buildings, factories and apartment blocks; peak cut of up to 22.8% against a target of up to 20%; an effect at incentive prices of 15 yen/kWh and above.
↗ SmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014)Trade-press account of the 2013 building trial: 22 event days between 18 July and 20 September, peak-time rebate against a baseline of past weekdays, participants randomly split each event day into notified and non-notified groups; up to 22.8% peak cut against a 20% target.
↗ NTT East BizDrive: interview with Yokohama's project promotion division on YSCP (18 Nov 2025)Interview with the city's project promotion division: HEMS in 4,200 homes, 2,300 EVs and 37,000 kW of solar; a 2013 household price-based demand-response trial with about 1,900 homes reached a peak cut of up to 15.2%; building trials over 20%.

📅 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: 2010–2014. 3 of 4 sources carry a publication date, from 24 October 2013 to 18 November 2025.

When the sources were published

  1. National Institute for Environmental Studies (NIES) · researchNIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)
  2. SmartCity JOURNAL · pressSmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014)
  3. NTT East · operatorNTT East BizDrive: interview with Yokohama's project promotion division on YSCP (18 Nov 2025)

Every source, with links ↑

What happened to this record

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

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 12 claims with their sources · the forensic record

Evidence file · public beta 12 addressable claims, 4 source dossiers, one permanent baseline. The file 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 12

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-5a3efbc7f4f3b3fa quantitative
selected Yokohama in 2010 as a Next-Generation Energy and Social System Demonstration Area
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city's own page states Yokohama was selected in 2010 by the Ministry of Economy, Trade and Industry as a 'Next-Generation Energy and Social System Demonstration Area'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. City of Yokohama — Yokohama Smart City Project (YSCP)
Claim 2 clm-6990e356b0129cf3 quantitative
34 of the country's leading energy operators, electronics manufacturers and construction companies
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The page describes the project as involving 34 of Japan's leading energy-related operators, electronics manufacturers, construction companies and more.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. City of Yokohama — Yokohama Smart City Project (YSCP)
Claim 3 clm-b158856687e80bdc quantitative
The demonstration ended in 2014
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city gives the demonstration period as 2010-2014.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. City of Yokohama — Yokohama Smart City Project (YSCP)
Claim 4 clm-a46ed991c2039ba4 descriptive
the partners were reorganised into a new public-private body, the Yokohama Smart Business Association
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The page states that a new public-private cooperation organization, the Yokohama Smart Business Association (YSBA), was established to advance 'from demonstration to implementation'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. City of Yokohama — Yokohama Smart City Project (YSCP)
Claim 5 clm-84e0466a729b94a7 descriptive
The city's own public page on the project publishes no result figures.
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The page sets out the period, the partner count and the successor organisation, and states no figures for households equipped, storage installed, generation added or emissions avoided. An absence has no passage to point to; the claim rests on the whole page.
Caveat
An absence is harder to source than a presence: this rests on the city's own English project page as fetched in August 2026, not on a statement that no figures exist anywhere.

Sources carrying this claim

  1. City of Yokohama — Yokohama Smart City Project (YSCP)
Claim 6 clm-efe467403e9bcaed quantitative
In the summer 2013 building trial, 14 buildings, factories and apartment blocks cut peak demand by up to 22.8% against a target of up to 20%
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The city's results, as summarised by the national environment institute, give a peak cut of up to 22.8% against a target of up to 20% for 14 participating buildings, factories and apartment blocks in July–September 2013.
Caveat
The figure is the best result on a single day, reported by the city; no outside body re-measured it.

Sources carrying this claim

  1. NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)
  2. SmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014)
Claim 7 clm-b3eb3db67473fcf7 descriptive
the city measured it by randomly splitting the participants on each event day into a group asked to save and a group that was not
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The trade report says the evaluation randomly assigned the 14 participants on each demand-response day to an issued and a non-issued group and measured the difference to exclude effects such as outdoor temperature.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. SmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014)
Claim 8 clm-5862773e8dfd94af quantitative
Demand response showed an effect only at incentives of 15 yen/kWh or more.
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The results summary says testing three incentive prices (5, 15 and 50 yen/kWh) confirmed a demand-response effect at 15 yen/kWh and above.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)
Claim 9 clm-48448831152b3a26 quantitative
A household trial the same summer, with about 1,900 homes on a higher afternoon price, cut peak demand by up to 15.2%, according to the city's project division.
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
In the interview, the city's project promotion division says a price-based demand-response trial with about 1,900 households in summer 2013, with a higher virtual price from 13:00 to 16:00, confirmed a peak-cut effect of up to 15.2%.
Caveat
Stated by the city in a 2025 interview published by a telecoms company; the household figure's measurement method is not given there.

Sources carrying this claim

  1. NTT East BizDrive: interview with Yokohama's project promotion division on YSCP (18 Nov 2025)
Claim 11 clm-912ba074261c869c descriptive
buildings respond more reliably than homes
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The building trial reached up to 22.8% and the household trial up to 15.2%; the city also reports that a 2014 building trial delivered more than 90% of the requested reduction.
Caveat
A comparison of two separate trials with different designs, not a controlled comparison.

Sources carrying this claim

  1. NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)
  2. NTT East BizDrive: interview with Yokohama's project promotion division on YSCP (18 Nov 2025)
Claim 12 clm-c913660d232b67ab quantitative
The figures sit in 2013 press releases and trade-press reports in Japanese, while the city's English project page, the one a foreign reader finds, reports none of them.
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this file
What the mapping says
The results summary cites the city's press release of October 2013; the trade report is from August 2014; the city's English page lists period, partners and successor body only.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013)
  2. SmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014)
  3. City of Yokohama — Yokohama Smart City Project (YSCP)
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 2026-10-14-success-audit effective 2026-10-14 · created 2026-10-14

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

sha256:2e0a69f7ce95c8ed07b769563e7517999fecc0563f182112e03edf9375484793
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
12
of 12 claims mapped
4
source dossiers
3
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
City of Yokohama with 34 partner companies; succeeded by the Yokohama Smart Business Association (YSBA)
Actor types
city-government, national-government, private
Funding model
ppp
Funding description
National demonstration programme of the Ministry of Economy, Trade and Industry with private partners
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

4 source dossiers

City of Yokohama — Yokohama Smart City Project (YSCP) city.yokohama.lg.jp · 6 linked claims

Open original source ↗

Stable source ID
src-a8a79ad5bf29eded
Publisher
Name not classified · city.yokohama.lg.jp
Type / language
web-page · language not classified
Published
Not recorded
Updated
2026-08-19
Source last checked
No source-level check date
Record last verified
2026-10-14
Dossier created
2026-10-14
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The city's English project page: METI designation in 2010, demonstration 2010–2014 with 34 companies, and the Yokohama Smart Business Association founded in 2015 to move 'from demonstration to implementation'; it gives no result figures.

Descriptive only — not page/paragraph exact
Claims linked
NIES Environmental Information: Yokohama publishes YSCP building demand-response results (24 Oct 2013) tenbou.nies.go.jp · 5 linked claims

Open original source ↗

Stable source ID
src-b1445be5a4447b0b
Publisher
Name not classified · tenbou.nies.go.jp
Type / language
web-page · language not classified
Published
2013-10-24
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-14
Dossier created
2026-10-14
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Summary of the city's press release on the summer 2013 building demand-response trial: 14 buildings, factories and apartment blocks; peak cut of up to 22.8% against a target of up to 20%; an effect at incentive prices of 15 yen/kWh and above.

Descriptive only — not page/paragraph exact
Claims linked
SmartCity Journal: results and issues of the YSCP demonstration (12 Aug 2014) smartcityjournal.jp · 3 linked claims

Open original source ↗

Stable source ID
src-5753078583388d45
Publisher
Name not classified · smartcityjournal.jp
Type / language
web-page · language not classified
Published
2014-08-12
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-14
Dossier created
2026-10-14
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Trade-press account of the 2013 building trial: 22 event days between 18 July and 20 September, peak-time rebate against a baseline of past weekdays, participants randomly split each event day into notified and non-notified groups; up to 22.8% peak cut against a 20% target.

Descriptive only — not page/paragraph exact
Claims linked
NTT East BizDrive: interview with Yokohama's project promotion division on YSCP (18 Nov 2025) business.ntt-east.co.jp · 2 linked claims

Open original source ↗

Stable source ID
src-6fad04426138dc3d
Publisher
Name not classified · business.ntt-east.co.jp
Type / language
web-page · language not classified
Published
2025-11-18
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-10-14
Dossier created
2026-10-14
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Interview with the city's project promotion division: HEMS in 4,200 homes, 2,300 EVs and 37,000 kW of solar; a 2013 household price-based demand-response trial with about 1,900 homes reached a peak cut of up to 15.2%; building trials over 20%.

Descriptive only — not page/paragraph exact
Claims linked
Known limits of this file
  • 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

🇩🇰 EnergyLab Nordhavn Smart Energy District · Copenhagen Both energy demonstrations ended on schedule; Nordhavn's results are public, Yokohama's sit in 2013 Japanese releases. 🇸🇪 Smart Energy City: Real-Time Energy Monitoring in Norra Djurgårdsstaden · Stockholm The district-sized version of the same idea: ~150 flats monitored in real time, also a research programme that stopped when funding did. 🇫🇮 Smart Kalasatama · Helsinki Living lab that also closed its agile-piloting phase on schedule — the standard ending for a funded smart-city programme.

Explore the wider context

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📎 Cite this project

1001 Smart Cities (2026). “Yokohama Smart City Project (YSCP)” — Yokohama, Japan. The Smart City Atlas. https://1001smartcities.org/projects/yokohama-smart-city-project/ (last verified 2026-10-14). Data: CC BY 4.0.

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

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