1001 Smart Cities
🇨🇭 Zürich

Greencity 2000-Watt District Energy System

🤖 AI-generated summary · ◆ 8 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.

8 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

Six groundwater wells and 215 geothermal probes heat the district on a 30-year utility contract. The label it was built to earn, Switzerland's first 2000-Watt district, was scrapped in 2024 for lack of demand.

Outcome🔄 Ongoing
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 byewz (Elektrizitätswerk der Stadt Zürich); district developed by Losinger Marazzi
Scale🏘️ District
Cost≈CHF 18.45M (ewz energy plant)
Fundingewz energy contracting, 30-year term

Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 8 more in Zürich · 🔌 Smart grid & energy guide · ⚡ Energy projects

Zurich's municipal utility ewz finances and runs the heat, cooling and power network for Greencity, certified as Switzerland's first 2000-Watt district. Six groundwater wells and 215 geothermal probes drive 5 MW of ammonia heat pumps, with 584 kWp of rooftop PV and a biogas boiler for peaks, on a 30-year contract.

Live 📅 since 2014

📊 Impact

City projected ~1,800 t CO2 avoided per year; the district now houses ~2,000 residents and ~3,000 workplaces.

🎓 Lesson

The federal 2000-Watt-Areal label Greencity pioneered was scrapped in 2024 for lack of demand, leaving Minergie-Areal and SNBS-Areal as the options going forward; the developer says new housing on the site is built to Minergie-P-ECO. Labels expire faster than the infrastructure they certify.

⚡ EnergySmart grid & energySolar & PVHeat & coolingSmart districts

Sources

↗ ewz (operator)Municipal utility's page: 30-year contracting, 4 NH3 heat pumps, groundwater as primary source, 215 borehole probes.
↗ City of Zurich (authority)Published 3 December 20142014 media release approving ewz's CHF 18.45M investment; projects ~1,800 t CO2 saved per year.
↗ Swiss Engineering STVIndependent technical breakdown: 6 extraction wells + 2 infiltration galleries, 215 probes at 220 m in 4 fields, 5 MW heat pumps, 584 kWp PV on 10 roofs, 2 MW biogas boiler.
↗ Losinger Marazzi (developer)District figures and 2014-2026 realisation timeline; first certified 2000-Watt-Areal claim.
↗ espazium (trade press)Published 18 March 2022The federal 2000-Watt-Areal certificate was discontinued in 2024; Minergie-Areal and SNBS-Areal replace it.
Show your work What this page rests on and what it can’t tell you · all 8 claims with their sources · the forensic record

Evidence Passport · public beta 8 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 8

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-9dbc1c59b636032c descriptive
Zurich's municipal utility ewz finances and runs the heat, cooling and power network for Greencity
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
ewz's own reference page: "Als Partner im Energiebereich haben wir eine ganzheitliche Lösung für die komplette Energieinfrastruktur geplant, finanziert und realisiert" ("as energy partner we planned, financed and built a complete solution for the entire energy infrastructure"), and "verantworten wir die komplette Energieinfrastruktur und stellen den Nutzenden das ganze Jahr über zuverlässig Strom sowie Wärme- und Kälteenergie zur Verfügung" (we are responsible for the complete energy infrastructure and reliably supply users year-round with electricity as well as heat and cooling). The city's 2014 press release confirms the same: "Das ewz wird für das Areal Greencity Energiedienstleistungen aus einer Hand erbringen. Es wird die Anlagen für die Kälte- und Wärmeversorgung planen, finanzieren, erstellen und betreiben."
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. ewz (operator)
  2. City of Zurich (authority)
Claim 2 clm-88ca8924cc222172 quantitative
Switzerland's first 2000-Watt district
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Losinger Marazzi's own project page states under "Besonderheiten": "Das erste zertifizierte 2000-Watt-Areal der Schweiz." ("The first certified 2000-Watt district in Switzerland.") That is the only one of the five listed sources that makes the nationwide claim.
Caveat
The 'first in Switzerland' claim comes from the site's own developer. Swiss Engineering STV's write-up on the same project instead calls it "das erste Quartier in Zürich" that meets 2000-Watt-Gesellschaft targets — a narrower, city-level claim, not a national one.

Sources carrying this claim

  1. Losinger Marazzi (developer)
Claim 3 clm-cf33e2e21ab4fc27 quantitative
Six groundwater wells and 215 geothermal probes drive 5 MW of ammonia heat pumps
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
ewz: "nun nebst sechs Grundwasserbrunnen 215 Erdwärmesonden mit einer Tiefe von je 220 Metern dafür, dass im Winter geheizt und im Sommer gekühlt werden kann", and "in der Energiezentrale von Greencity über vier Ammoniak Wärmepumpen mit einer Gesamtleistung von 5 MW auf das erforderliche Temperaturniveau von 35 °C erwärmt." Swiss Engineering STV independently confirms the same counts: "6 Grundwasser-Entnahmebrunnen ... 215 Erdwärmesonden à 220 m Tiefe (4 Felder)" and "4 Ammoniak WP/KM à total 5 MW Heizleistung".
Caveat
Swiss Engineering STV also lists 2 groundwater infiltration galleries alongside the 6 extraction wells, which the entry's snippet omits — not a contradiction, just a simplification.

Sources carrying this claim

  1. ewz (operator)
  2. Swiss Engineering STV
Claim 4 clm-ab3c0a62a4dbb478 quantitative
584 kWp of rooftop PV and a biogas boiler for peaks
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Swiss Engineering STV gives the exact figure: "Die Photovoltaik-Anlage verteilt auf 10 Dächern ... Sie hat eine Leistung von insgesamt 584 kWp und ist in Ost-West Richtung aufgeständert." It also lists "1 Biogaskessel à 2 MW Heizleistung" used for redundancy and peak demand ("Redundanz sowie zur Deckung des Spitzenbedarfs"). The city's 2014 release corroborates the biogas-for-peaks role: "Für die Spitzenlast im Winter steht zusätzlich Biogas zur Verfügung."
Caveat
ewz's own current reference page rounds this down to "über 500 kWp installierte PV-Leistung" rather than citing 584 kWp specifically — not a contradiction (584 is indeed over 500), just a less precise figure from the operator itself.

Sources carrying this claim

  1. Swiss Engineering STV
  2. City of Zurich (authority)
Claim 5 clm-7cf116b8374d8082 quantitative
on a 30-year contract
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
ewz: "In Greencity verantworten wir aufgrund eines langfristigen Contracting-Vertrags über 30 Jahre das gesamte Wärme-, Kälte- und Stromnetz des Areals sowie die energietechnischen Anlagen."
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. ewz (operator)
Claim 6 clm-bfcf9a43978b7c39 quantitative
City projected ~1,800 t CO2 avoided per year
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The city's December 2014 press release, announcing council approval of ewz's contracting budget, states: "Dank dieser umweltfreundlichen Energieversorgung lassen sich pro Jahr 1800 Tonnen CO₂ einsparen, was rund 37 Tanklastwagen Öl entspricht." This is explicitly framed as an expected saving from the approved concept, i.e. a projection at contracting stage, matching the entry's own "projected" framing.
Caveat
This is the 2014, contracting-stage projection. Swiss Engineering STV's later technical breakdown gives a slightly different, presumably more current, full-build-out figure for Greencity alone (1,900 t/year), and ewz's current reference page cites 2,400 t/year — but for the combined "Greencity & Areal West" area, which is larger than Greencity alone.

Sources carrying this claim

  1. City of Zurich (authority)
Claim 7 clm-4aa5da53007077f3 quantitative
the district now houses ~2,000 residents and ~3,000 workplaces
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Losinger Marazzi's current project page describes Greencity in the present tense: "Greencity beherbergt: 730 Wohnungen (ca. 2000 BewohnerInnen) 43 000 m2 Büroflächen (ca. 3000 Arbeitsplätze) 4500 m2 Hotel (ca. 350 Gäste)" ("Greencity houses: 730 apartments [approx. 2000 residents], 43,000 sqm of office space [approx. 3000 workplaces], 4,500 sqm hotel [approx. 350 guests]"). The site is described as largely complete, with only the last building (B6/Vergé) still under construction as of this reading.
Caveat
These are the developer's own approximate, self-reported figures on a project-marketing page, not an independent census. They also closely mirror the city's original 2014 construction target for the same district ("Wohnungen für 1500 bis 2000 Menschen sowie Raum für etwa 3000 Arbeitsplätze"), so "now houses" may reflect the site's planned near-final capacity as much as a precisely counted current occupancy.

Sources carrying this claim

  1. Losinger Marazzi (developer)
Claim 8 clm-3afb3be8f4fbc613 quantitative
The federal 2000-Watt-Areal label Greencity pioneered was scrapped in 2024 for lack of demand
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
espazium, an independent trade-press outlet, reported: "Per 2024 macht die Behörde Schluss mit der Zertifizierung von 2000-Watt-Arealen." ("As of 2024 the authority is ending certification of 2000-Watt districts.") It gives the reason explicitly: "«Die zu geringe Nachfrage» bewegt nun das Bundesamt, die Finanzierung überraschend zu beenden" ("'Insufficient demand' is now moving the federal office to unexpectedly end the funding") — after 43 certified sites nationwide.
Caveat
This espazium article is dated 18 March 2022. It reports the federal energy office's announced plan to end the certification scheme "per 2024" via a harmonisation agreement signed that month — it documents the plan, not an after-the-fact confirmation that the scheme was actually discontinued on schedule in 2024.

Sources carrying this claim

  1. espazium (trade press)
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-evidence-baseline effective 2026-07-29 · created 2026-08-22

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

sha256:a6f01d595de4bd1f307f49ddbf538c41708a66cb82a3d78cc6837ef2b4dc4484
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
8
of 8 claims mapped
5
source dossiers
2
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
ewz (Elektrizitätswerk der Stadt Zürich); district developed by Losinger Marazzi
Actor types
utility
Funding model
utility
Funding description
ewz energy contracting, 30-year term
Cost
≈CHF 18.45M (ewz energy plant)
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

5 source dossiers

ewz (operator) ewz.ch · 3 linked claims

Open original source ↗

Stable source ID
src-74787092410c9e8a
Publisher
Name not classified · ewz.ch
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-29
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Municipal utility's page: 30-year contracting, 4 NH3 heat pumps, groundwater as primary source, 215 borehole probes.

Descriptive only — not page/paragraph exact
Claims linked
City of Zurich (authority) stadt-zuerich.ch · 3 linked claims

Open original source ↗

Stable source ID
src-eb7c6f443b5ae6db
Publisher
Name not classified · stadt-zuerich.ch
Type / language
web-page · language not classified
Published
2014-12-03
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-29
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

2014 media release approving ewz's CHF 18.45M investment; projects ~1,800 t CO2 saved per year.

Descriptive only — not page/paragraph exact
Claims linked
Swiss Engineering STV swissengineering.ch · 2 linked claims

Open original source ↗

Stable source ID
src-7aea118c4d767afb
Publisher
Name not classified · swissengineering.ch
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-29
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Independent technical breakdown: 6 extraction wells + 2 infiltration galleries, 215 probes at 220 m in 4 fields, 5 MW heat pumps, 584 kWp PV on 10 roofs, 2 MW biogas boiler.

Descriptive only — not page/paragraph exact
Claims linked
Losinger Marazzi (developer) losinger-marazzi.ch · 2 linked claims

Open original source ↗

Stable source ID
src-9b92547505343d62
Publisher
Name not classified · losinger-marazzi.ch
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-29
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

District figures and 2014-2026 realisation timeline; first certified 2000-Watt-Areal claim.

Descriptive only — not page/paragraph exact
Claims linked
espazium (trade press) espazium.ch · 1 linked claim

Open original source ↗

Stable source ID
src-7b62afff4ae12913
Publisher
Name not classified · espazium.ch
Type / language
web-page · language not classified
Published
2022-03-18
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-29
Dossier created
2026-08-22
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The federal 2000-Watt-Areal certificate was discontinued in 2024; Minergie-Areal and SNBS-Areal replace it.

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.

Continue exploring

Compare this project

🇫🇮 Katri Vala Heat Pump Plant · Helsinki Both draw heat via pumps on a local water source — Zurich groundwater under a 30-year utility contract, Helsinki treated wastewater. 🇸🇪 Open District Heating: Selling Waste Heat Into the Grid · Stockholm Contrast in heat economics: Stockholm markets a buyback of waste heat; Zurich locked ewz into one 30-year energy-contracting deal instead. 🇨🇭 EnerGIS — Zurich's Address-Level Heating Options Map · Zürich Exactly the kind of network EnerGIS would flag: Greencity is one of the thermal-network zones the address lookup tells you about.

Explore the wider context

🪦 Why smart cities fail📖 District heating📖 Lighthouse project📖 Microgrid
📎 Cite this project

1001 Smart Cities (2026). “Greencity 2000-Watt District Energy System” — Zürich, Switzerland. The Smart City Atlas. https://1001smartcities.org/projects/zurich-greencity/ (last verified 2026-07-29). Data: CC BY 4.0.

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

🚩 Report an error · 🔔 Follow changes to this entry (RSS)

✉️ Get the next source-checked smart-city project in your inbox

One short email a week: the Landmark, one Insight, the new cities. No spam, one-click unsubscribe. About the newsletter · RSS