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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsBaselEnergie21 GmbH
Energie21 GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Energie21 GmbH is consulting and planning projects in the field of renewable energies, particularly photovoltaics, as well as decarbonizing businesses and households. The company supports customers in planning and implementing photovoltaic systems and helps them find solutions to reduce their energy consumption and switch to renewable energies.

AI-generated
Offering

Products & services

Industry:Solar & Photovoltaics
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3.9/5

Energie21 GmbH

✓ Offered7
Design and sizing of photovoltaic systems
Design of PV systems with on-site surveying, roof measurement, module and string planning, inverter sizing, yield calculations, self-consumption analysis and support for funding applications.
Tender analysis and comparison
Neutral analysis and tabular comparison of submitted photovoltaic tenders, including recommendation, comments, review of the results and tender check for smaller projects.
Project implementation support
Support for photovoltaic projects from tendering through bid evaluation and the work contract to schedule and cost monitoring and rectification of defects.
Return optimisation
Optimisation of the benefit of photovoltaic systems, in particular to improve self-consumption and the cost-effective sizing of PV projects.
Decarbonisation plan
Advisory and planning for the step-by-step decarbonisation of industry and commercial businesses, including analysis of processes, technologies, energy sources and multiple solution options towards net zero.
Target agreement between the federal government and companies
Preparation and monitoring of target agreements with the federal government to reduce energy consumption and greenhouse-gas emissions, including advice on refunds and provisions for large energy consumers.
Initial advisory service for renewable heating
Free initial advisory service on renewable heating systems for existing heating installations, in particular for older systems as part of the federal programme.
Trust & reputation

ranQ Trust Score of Energie21 GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

Energie21 GmbH scores 70.7 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.75.024%
  • 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.40.910%
  • 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.95.08%
Energie21 GmbH scores 65.0 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.58.012%
  • 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.55.07%
Energie21 GmbH scores 85.0 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).85.022%
Energie21 GmbH scores 5.4 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 35.5.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Energie21 GmbH reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 4 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. 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 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Aeschenplatz 6
4052 Basel
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
Limited Liability Company
UID
CHE-406.586.380
Founded
2022 · 4 years
Last commercial register change
October 7, 2025
Employees
1 to 10
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.
88.0
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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