1001 Smart Cities

Permanent project revision

Suvilahti Solar Power Plant (Panel Rental)

Revision 2026-08-27-claims-and-sources · effective 2026-08-27

Superseded. A later revision exists: 2026-08-27-editorial-review →

unreviewed

Created the first structured Evidence Passport with 7 claims and 4 source dossiers.

sha256:22e7647321fc37c8ccdc833e6343a0e54c624002c0043c4f3b92f2658b9d2988
All revisions → Current entity page →

Change set

  • add /evidencePassport — Added claim-level evidence mapping and source dossiers.
  • add /revisionHistory — Established a permanent, hash-addressed baseline revision.
7
of 7 claims mapped
4
source dossiers
4
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Claims, one by one

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-fb1cec8125b67473 descriptive
Helen built Finland's largest solar plant to date on the old Suvilahti gasworks site
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
pv magazine, 12 May 2015, on work underway on 'Finland's largest PV system'; Helen's own launch release gives the Suvilahti gasworks site and the 340 kW capacity.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. pv magazine (independent trade press)
  2. Helen (operator) — Solar power production started in the Suvilahti district of Helsinki (18 March 2015)
Claim 2 clm-d63dda920ebe4490 quantitative
about 1,200 rooftop panels that residents without a roof of their own could rent for a monthly fee, with the panel's output credited against their bill
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Yle: 'The project involves 1,200 solar panels' and 'The agreement allows Helsinki Energy customers to rent solar panels, the output from which is then deducted from the customer's monthly electricity consumption.' Helen's release gives 1,188 panels and 340 kW.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yle (independent press)
  2. Helen (operator) — Solar power production started in the Suvilahti district of Helsinki (18 March 2015)
Claim 3 clm-965123111d600e6d quantitative
The utility announced the scheme in July 2014 and reported a couple of hundred rentals in the first hour; more than 900 panels had been booked by early October, when the first formal rental agreements were signed
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Yle, 6 October 2014: 'In July the utility announced that it would be installing solar panels on the rooftop of a power substation'; 'When we launched the service, we had a couple hundred sales in the first hour'; 'Advance bookings so far have exceeded 900 and the utility began offering formal rental agreements from Monday.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yle (independent press)
Claim 4 clm-94c55053c2d56202 quantitative
Production started in March 2015, and a 2018 wall-mounted addition grew capacity to 363.52kWp
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Helen's release of 18 March 2015 announces that solar power production had started at Suvilahti; the release of 11 May 2018 adds a solar wall of 84 panels and 23.52 kWp, taking the total to 363.52 kWp.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Helen (operator) — Solar power production started in the Suvilahti district of Helsinki (18 March 2015)
  2. Helen (operator) — Aurinkoseinä: solar wall expansion at Suvilahti (11 May 2018)
Claim 5 clm-5487f9cdf06d3287 quantitative
Helen reported a couple of hundred panels rented in the first hour and more than 900 of about 1,200 booked by early October 2014, saying it had met its sales targets
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Yle quotes Helen's unit manager on both the first hour and the running total, and: 'We have reached our sales targets and are very satisfied.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yle (independent press)
Claim 6 clm-71f2575f6d7dc48f quantitative
The plant produces roughly 275MWh a year
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Helen's launch release gives an expected annual output of about 275 MWh.
Caveat
An operator figure for expected annual output rather than a metered result.

Sources carrying this claim

  1. Helen (operator) — Solar power production started in the Suvilahti district of Helsinki (18 March 2015)
Claim 7 clm-fefcd93b80eb5fab quantitative
Renting one cost EUR 4.40 a month and returned an estimated EUR 1 a month of electricity
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Yle: 'For a monthly rental fee of 4.40 euros, customers will see the output of their solar panels deducted from electricity consumption on their monthly bills. The utility estimated that the electricity generated by one panel would correspond to about one euro each month, reducing the panel rental cost to 3.40 euros per month.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yle (independent press)

Source dossiers and revision state

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 2026-08-27-claims-and-sources effective 2026-08-27 · created 2026-08-27

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

Erratum on this revision's envelope. The snapshot, its hash and its permanent link are untouched.

  • createdAt previously read 2026-08-29T20:00:00Z. The batching script that produced this revision advanced createdAt into the future to satisfy the strictly-increasing order the validator requires per entity. The value never recorded a real event; the corrected value is the moment the revision provably existed in the repository. Corrected to 2026-08-27T02:55:34Z on 2026-08-27; evidence: first appears in commit 0f98748c4d, committed 2026-08-27T02:55:34Z.
sha256:22e7647321fc37c8ccdc833e6343a0e54c624002c0043c4f3b92f2658b9d2988
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
7
of 7 claims mapped
4
source dossiers
4
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Helen
Actor types
utility
Funding model
utility
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

4 source dossiers

Helen (operator) — Solar power production started in the Suvilahti district of Helsinki (18 March 2015) helen.fi · 4 linked claims

Open original source ↗

Stable source ID
src-8d1b2b9891db732f
Publisher
Name not classified · helen.fi
Type / language
web-page · language not classified
Published
2015-03-18
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-29
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Official launch release: commissioning date, 340kW capacity, 1,188 panels, ~275MWh/year.

Descriptive only — not page/paragraph exact
Claims linked
Helen (operator) — Aurinkoseinä: solar wall expansion at Suvilahti (11 May 2018) helen.fi · 1 linked claim

Open original source ↗

Stable source ID
src-732a813e008d3dfe
Publisher
Name not classified · helen.fi
Type / language
web-page · language not classified
Published
2018-05-11
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-29
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

2018 solar-wall expansion: +23.52kWp / 84 panels, total 363.52kWp.

Descriptive only — not page/paragraph exact
Claims linked
pv magazine (independent trade press) pv-magazine.com · 1 linked claim

Open original source ↗

Stable source ID
src-b66f6e3133aae210
Publisher
Name not classified · pv-magazine.com
Type / language
web-page · language not classified
Published
2015-05-12
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-29
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Independent confirmation of 340kW capacity and 'Finland's largest PV system' framing.

Descriptive only — not page/paragraph exact
Claims linked
Yle (independent press) yle.fi · 4 linked claims

Open original source ↗

Stable source ID
src-ed3c8aac6dd2a266
Publisher
Name not classified · yle.fi
Type / language
web-page · language not classified
Published
2014-10-06
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-29
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Published 6 October 2014, and the source for how the rental actually sold. Helen's unit manager Perttu Lahtinen: 'When we launched the service, we had a couple hundred sales in the first hour.' Advance bookings had 'exceeded 900' of about 1,200 panels by the date of the article, and formal rental agreements began that Monday. Also the economics: a monthly rental fee of EUR 4.40 against an estimated EUR 1 a month of electricity credited back, and about 285 watts per panel.

Descriptive 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.