How much solar power does Monthey already produce?

501 solar installations with 9.5 MWp in total are listed in the Swiss Federal Office of Energy register. That is an estimated ~8.8% of the municipality's roof potential.

Where do these numbers come from?

From federal open data: the register of electricity production plants and the solar potential of Swiss municipalities (Swiss Federal Office of Energy), plus swisstopo municipal boundaries. We only show totals per municipality, never individual installations.

Can I start a LEG in Monthey?

Yes. A local electricity community is possible in any municipality, as long as all participants are in the same grid area and close to each other. UpGrid handles registration, metering and billing.

All municipalities in the canton of Valais

Solar power · Canton of ValaisLEG forming

Solar power in Monthey

501 solar installations with 9.5 MWp of capacity are installed in Monthey.

Go to the community

Solar installations: 501
Installed capacity: 9.5 MWp
Roof potential in use: ~8.8%; Estimate
Rank in the canton of Valais: 53 of 122; by roof potential in use

Growth by build yearNew capacity installed per year in kWp

Roof potential

How much sun falls on the roofs of Monthey

The suitable roofs of Monthey could deliver around 109 GWh of solar power a year. An estimated ~8.8% of it is used today.

Roof potential per month (GWh)

A LEG is forming in Monthey

A local electricity community is collecting sign-ups here. The more neighbours join, the sooner it starts.

Communities in Monthey

Monthey Energies SA - Monthey
Forming
Monthey, VS

Communities nearby

Genedis SA - Massongex
Forming
Massongex, VS
Genedis SA - Vérossaz
Forming
Vérossaz, VS
Romande Energie SA - Collombey-Muraz
Forming
Collombey-Muraz, VS

Join the LEG in Monthey

Get solar power from your neighbourhood. Joining is free and you keep your electricity supplier.

Go to the community

Questions about solar power in Monthey

How much solar power does Monthey already produce?: 501 solar installations with 9.5 MWp in total are listed in the Swiss Federal Office of Energy register. That is an estimated ~8.8% of the municipality's roof potential.
Where do these numbers come from?: From federal open data: the register of electricity production plants and the solar potential of Swiss municipalities (Swiss Federal Office of Energy), plus swisstopo municipal boundaries. We only show totals per municipality, never individual installations.
Can I start a LEG in Monthey?: Yes. A local electricity community is possible in any municipality, as long as all participants are in the same grid area and close to each other. UpGrid handles registration, metering and billing.

Sources: Swiss Federal Office of Energy (SFOE), swisstopo, opendata.swiss. As of October 2026. Totals per municipality only, no individual installations.

Build year	Installations	Capacity (kWp)
before 2012	4	100
2012	6	385
2013	1	221
2014	8	224
2015	18	312
2016	11	220
2017	21	237
2018	29	307
2019	34	380
2020	34	319
2021	40	518
2022	56	999
2023	118	2’059
2024	67	1’275
2025	48	1’556
2026	6	399

Month	GWh
Jan	3.1
Feb	5.1
Mar	9
Apr	11.8
May	13.4
Jun	15
Jul	15.2
Aug	13.1
Sept	10.2
Oct	6.8
Nov	3.6
Dec	2.4

Solar power in Monthey

How much sun falls on the roofs of Monthey

A LEG is forming in Monthey

Communities in Monthey

Monthey Energies SA - Monthey

Communities nearby

Genedis SA - Massongex

Genedis SA - Vérossaz

Romande Energie SA - Collombey-Muraz

Join the LEG in Monthey

Questions about solar power in Monthey