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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesElectrical Planning & InstallationMontheyGRAU Electricité SA
GRAU Electricité SA Logo
Verified· 4 sourcesTrust Score
Summary

About the company

GRAU Electricité SA is an electrical service provider that designs, installs and maintains electrical systems. Its services include photovoltaic installations, home automation (domotics), lighting, telephony and network solutions, electric vehicle charging stations, OIBT safety inspections, district heating connections and repair/emergency services; the company also sells household appliances via a webshop.

AI-generated
Offering

Products & services

Industry:Electrical Planning & Installation
✓ Offered9
Electrical installations
Electrical installations for residential homes and industrial buildings, in new builds and renovations; planning, tailored advice and solutions suited to technical requirements.
OIBT inspection
OIBT inspection of electrical installations, control planning, coordination of the parties involved and delivery of an official safety certificate in case of compliance.
Smart home
Smart home for new or renovated buildings, heating control, lighting management, automation of technical tasks and centralized touchscreens.
Photovoltaic systems
Photovoltaic systems for homes and businesses, solar panels, mounting either on the surface or integrated, administrative procedures, final certification and subsidy applications.
Telephony & network
Telephony and network with Internet and TV connection, business telephone systems, mobile subscriptions, repair of smartphones and management of subscriptions.
Private charging stations
Private charging stations for electric vehicles, needs analysis, technical and financial advice, turnkey installation and after-sales service.
Lighting
Lighting for homes, offices and outdoor areas, street lighting, ambient lighting and support with the selection and positioning of luminaires.
Remote heating
Remote heating for secondary residences and chalets, remote control via smartphone, tablet or computer, temperature setting and technical support.
Troubleshooting
Troubleshooting and after-sales service for electrical installations and household appliances, repairs, quotation requests and 24/24h, 7/7d on-call service by subscription.
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4.5/5

GRAU Electricité SA

Trust & reputation

ranQ Trust Score of GRAU Electricité SA: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 100% · As of October 2026

GRAU Electricité SA scores 85.8 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.80.124%
  • 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.88.110%
  • 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.100.08%
GRAU Electricité SA scores 92.5 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.70.07%
GRAU Electricité SA 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%
GRAU Electricité SA scores 56.5 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 35.82.94%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.30.04%
Qualifications+0.00

GRAU Electricité SA reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.7 out of 5 stars from 31 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.7
of 5

Aggregated from 31 reviews across all connected sources

Sources
GGoogle4.731
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

November 12, 2025Media
Qui sont les 3 finalistes du Prix Sommet 2025?
lenouvelliste.ch
September 3, 2022Media
Monthey: chez les Grau, le courant passe depuis un siècle
lenouvelliste.ch

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Location

Avenue de l'Industrie 8
1870 Monthey
Opening hours
Mon
08:00 - 12:00, 13:30 - 18:30
Tue
08:00 - 12:00, 13:30 - 18:30
Wed
08:00 - 12:00, 13:30 - 18:30
Thu
08:00 - 12:00, 13:30 - 18:30
Fri
08:00 - 12:00, 13:30 - 18:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.758.518
Founded
1989 · 37 years
Last commercial register change
February 15, 2021
Employees
11 to 20
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.100.03%
    • Full methodology

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