Which municipality in canton St. Gallen has the greatest solar potential?

St. Gallen, whose roofs could generate about 323 GWh of electricity a year (2025) — the greatest modelled roof potential of any municipality in canton St. Gallen.

Does this mean the municipality actually produces this much solar power?

No. It is the modelled potential of the available roof surfaces — the electricity they could generate if fully used. Actual installed photovoltaics produce far less. The figure comes from the BFE solar model and scales with how much roof area a municipality has.

← Canton St. Gallen overview

Ranking · Data 2025 · Source: BFS

The greatest solar potential in canton St. Gallen

Name: Solar potential in canton St. Gallen (SG): full ranking (2025)
Creator: Bundesamt für Energie (BFE)

National ranking →

St. Gallen has the greatest solar-energy potential in canton St. Gallen: its roofs could generate about 323 GWh of electricity a year. Next come Wil (157 GWh) and Gossau (147 GWh). This is modelled roof potential — largest where there is the most roof area, not current generation. Source: BFE.

Ranking

BFE · 2025

Rank	Municipality	Roof potential	Residents
1	St. Gallen	323 GWh	78'213
2	Wil	157 GWh	24'980
3	Gossau	147 GWh	18'454
4	Rapperswil-Jona	146 GWh	28'640
5	Altstätten	127 GWh	12'456
6	Oberriet	124 GWh	9'291
7	Eschenbach	97 GWh	10'169
8	Uzwil	94 GWh	14'279
9	Kirchberg	92 GWh	9'755
10	Sennwald	90 GWh	6'269
11	Buchs	88 GWh	13'931
12	Neckertal	83 GWh	6'437
13	Widnau	76 GWh	10'337
14	Wattwil	73 GWh	9'161
15	Thal	72 GWh	7'097
16	Mels	68 GWh	9'538
17	Flawil	64 GWh	10'631
18	Diepoldsau	63 GWh	6'928
19	Grabs	63 GWh	7'402
20	Au	60 GWh	8'481
21	Wildhaus-Alt St. Johann	59 GWh	2'618
22	Oberbüren	57 GWh	4'660
23	Nesslau	57 GWh	3'833
24	Bütschwil-Ganterschwil	55 GWh	5'202
25	St. Margrethen	54 GWh	6'558
26	Goldach	54 GWh	9'709
27	Wittenbach	54 GWh	10'026
28	Waldkirch	53 GWh	3'544
29	Gaiserwald	52 GWh	8'609
30	Flums	52 GWh	5'347
31	Gommiswald	51 GWh	5'657
32	Wartau	50 GWh	5'496
33	Zuzwil	49 GWh	5'026
34	Jonschwil	49 GWh	4'023
35	Ebnat-Kappel	48 GWh	5'092
36	Walenstadt	47 GWh	5'852
37	Sevelen	47 GWh	5'392
38	Uznach	46 GWh	7'014
39	Oberuzwil	44 GWh	6'674
40	Bad Ragaz	44 GWh	6'835
41	Balgach	42 GWh	5'139
42	Sargans	41 GWh	6'522
43	Kaltbrunn	41 GWh	5'084
44	Vilters-Wangs	38 GWh	5'057
45	Niederhelfenschwil	38 GWh	3'256
46	Mosnang	38 GWh	2'969
47	Gams	37 GWh	3'711
48	Schänis	37 GWh	4'154
49	Berneck	35 GWh	3'989
50	Benken	35 GWh	3'035
51	Degersheim	34 GWh	4'132
52	Rorschach	34 GWh	9'955
53	Rebstein	33 GWh	5'051
54	Steinach	32 GWh	3'580
55	Mörschwil	31 GWh	3'662
56	Rüthi	30 GWh	2'542
57	Schmerikon	30 GWh	4'162
58	Rorschacherberg	29 GWh	7'685
59	Niederbüren	26 GWh	1'497
60	Amden	26 GWh	1'906
61	Rheineck	25 GWh	3'516
62	Quarten	23 GWh	3'085
63	Marbach	22 GWh	2'118
64	Muolen	22 GWh	1'257
65	Häggenschwil	20 GWh	1'431
66	Andwil	20 GWh	2'128
67	Lütisburg	19 GWh	1'645
68	Pfäfers	19 GWh	1'601
69	Eggersriet	17 GWh	2'475
70	Tübach	16 GWh	1'594
71	Eichberg	13 GWh	1'571
72	Weesen	12 GWh	1'871
73	Lichtensteig	11 GWh	2'079
74	Berg	9 GWh	1'012
75	Untereggen	9 GWh	1'027

Bundesamt für Energie (BFE), retrieved 10.08.2026

How we measure this

BFE

Modelled annual electricity that rooftop photovoltaics could produce across the whole municipality, in gigawatt-hours per year, from the BFE «Solarenergiepotenziale der Schweizer Gemeinden» model (2025 snapshot). It is a potential, not installed capacity or actual generation, and it scales with roof area — so large towns lead simply because they have more roofs. It is a rolling model snapshot, not an annual survey. The companion roofs-plus-façades scenario adds vertical surfaces.

Frequently asked questions

Which municipality in canton St. Gallen has the greatest solar potential?: St. Gallen, whose roofs could generate about 323 GWh of electricity a year (2025) — the greatest modelled roof potential of any municipality in canton St. Gallen.
Does this mean the municipality actually produces this much solar power?: No. It is the modelled potential of the available roof surfaces — the electricity they could generate if fully used. Actual installed photovoltaics produce far less. The figure comes from the BFE solar model and scales with how much roof area a municipality has.