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.

Ranking · Data 2025 · Source: BFS

The greatest solar potential in canton St. Gallen

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	79'487
2	Wil	157 GWh	25'444
3	Gossau	147 GWh	18'943
4	Rapperswil-Jona	146 GWh	28'836
5	Altstätten	127 GWh	12'788
6	Oberriet	124 GWh	9'417
7	Eschenbach	97 GWh	10'401
8	Uzwil	94 GWh	14'676
9	Kirchberg	92 GWh	9'879
10	Sennwald	90 GWh	6'428
11	Buchs	88 GWh	14'287
12	Neckertal	83 GWh	6'446
13	Widnau	76 GWh	10'485
14	Wattwil	73 GWh	9'262
15	Thal	72 GWh	7'217
16	Mels	68 GWh	9'581
17	Flawil	64 GWh	10'672
18	Diepoldsau	63 GWh	6'933
19	Grabs	63 GWh	7'535
20	Au	60 GWh	8'771
21	Wildhaus-Alt St. Johann	59 GWh	2'614
22	Oberbüren	57 GWh	4'762
23	Nesslau	57 GWh	3'937
24	Bütschwil-Ganterschwil	55 GWh	5'385
25	St. Margrethen	54 GWh	6'731
26	Goldach	54 GWh	9'872
27	Wittenbach	54 GWh	10'157
28	Waldkirch	53 GWh	3'581
29	Gaiserwald	52 GWh	8'828
30	Flums	52 GWh	5'458
31	Gommiswald	51 GWh	5'838
32	Wartau	50 GWh	5'617
33	Zuzwil	49 GWh	4'994
34	Jonschwil	49 GWh	3'979
35	Ebnat-Kappel	48 GWh	5'353
36	Walenstadt	47 GWh	6'083
37	Sevelen	47 GWh	5'405
38	Uznach	46 GWh	7'114
39	Oberuzwil	44 GWh	6'864
40	Bad Ragaz	44 GWh	6'836
41	Balgach	42 GWh	5'229
42	Sargans	41 GWh	6'670
43	Kaltbrunn	41 GWh	5'128
44	Vilters-Wangs	38 GWh	5'168
45	Niederhelfenschwil	38 GWh	3'309
46	Mosnang	38 GWh	2'936
47	Gams	37 GWh	3'736
48	Schänis	37 GWh	4'213
49	Berneck	35 GWh	4'026
50	Benken	35 GWh	3'119
51	Degersheim	34 GWh	4'209
52	Rorschach	34 GWh	10'389
53	Rebstein	33 GWh	5'084
54	Steinach	32 GWh	3'579
55	Mörschwil	31 GWh	3'702
56	Rüthi	30 GWh	2'667
57	Schmerikon	30 GWh	4'168
58	Rorschacherberg	29 GWh	7'741
59	Niederbüren	26 GWh	1'571
60	Amden	26 GWh	1'896
61	Rheineck	25 GWh	3'566
62	Quarten	23 GWh	3'118
63	Marbach	22 GWh	2'147
64	Muolen	22 GWh	1'251
65	Häggenschwil	20 GWh	1'432
66	Andwil	20 GWh	2'117
67	Lütisburg	19 GWh	1'647
68	Pfäfers	19 GWh	1'647
69	Eggersriet	17 GWh	2'370
70	Tübach	16 GWh	1'587
71	Eichberg	13 GWh	1'614
72	Weesen	12 GWh	1'895
73	Lichtensteig	11 GWh	2'157
74	Berg	9 GWh	1'021
75	Untereggen	9 GWh	1'035

Swiss Federal Office of Energy (SFOE), retrieved 24.09.2026

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.