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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsZurichSolar21 AG
Solar21 AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Solar21 AG is an energy services provider that offers institutional property owners comprehensive management of photovoltaic systems, including analysis, planning, administration and monitoring. Its services include power purchase agreements (PPAs) with fixed-price purchase of locally produced solar power, tenant electricity products under the Strom21 offering, and optimisation measures including storage and e-mobility integration.

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Offering

Products & services

Industry:Solar & Photovoltaics
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4.0/5

Solar21 AG

✓ Offered3
Solar power management for properties
Analysis, consulting, planning and operation of solar power solutions for properties; including investment and financing models, power management, communication, administration and monitoring.
Strom21
Solar power product for tenants with the Eco, Plus and Star variants; solar power is purchased at a fixed price, marketed and selected or changed via the customer center.
PPA Solar21
Long-term power purchase agreement for existing or planned solar power plants; with fixed remuneration, risk reduction, sales, communication and administration within the property.
Trust & reputation

ranQ Trust Score of Solar21 AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 100% · As of October 2026

Solar21 AG scores 56.6 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.70.824%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.27.910%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.50.08%
Solar21 AG scores 92.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
Solar21 AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
Solar21 AG scores 26.5 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.42.94%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

Solar21 AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 2 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

October 18, 2023Media
Solar21 installiert 8000 m² grosse PV-Anlage bei Trunz
leaderdigital.ch

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Location

Max-Högger-Strasse 2
8048 Zurich
Opening hours
Mon
09:00 - 17:00
Tue
09:00 - 17:00
Wed
09:00 - 17:00
Thu
09:00 - 17:00
Fri
09:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-110.337.140
Founded
2003 · 23 years
Last commercial register change
July 6, 2026
Employees
21 to 50
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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