Which municipality in canton Solothurn has the greatest solar potential?

Grenchen, whose roofs could generate about 115 GWh of electricity a year (2025) — the greatest modelled roof potential of any municipality in canton Solothurn.

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 Solothurn overview

Ranking · Data 2025 · Source: BFS

The greatest solar potential in canton Solothurn

Name: Solar potential in canton Solothurn (SO): full ranking (2025)
Creator: Bundesamt für Energie (BFE)

National ranking →

Grenchen has the greatest solar-energy potential in canton Solothurn: its roofs could generate about 115 GWh of electricity a year. Next come Olten (105 GWh) and Solothurn (96 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	Grenchen	115 GWh	18'295
2	Olten	105 GWh	18'715
3	Solothurn	96 GWh	16'855
4	Biberist	78 GWh	9'345
5	Oensingen	66 GWh	6'636
6	Zuchwil	60 GWh	9'452
7	Derendingen	50 GWh	7'008
8	Balsthal	49 GWh	6'501
9	Neuendorf	48 GWh	2'404
10	Bellach	48 GWh	5'453
11	Hägendorf	46 GWh	5'277
12	Gerlafingen	43 GWh	5'794
13	Däniken	43 GWh	3'041
14	Egerkingen	40 GWh	4'300
15	Buchegg	40 GWh	2'926
16	Dulliken	39 GWh	5'396
17	Luterbach	38 GWh	3'640
18	Dornach	38 GWh	6'862
19	Selzach	38 GWh	3'682
20	Wangen bei Olten	37 GWh	5'539
21	Bettlach	36 GWh	4'978
22	Schönenwerd	36 GWh	5'201
23	Härkingen	36 GWh	1'767
24	Trimbach	34 GWh	6'667
25	Lostorf	33 GWh	4'088
26	Niedergösgen	31 GWh	4'197
27	Subingen	31 GWh	3'285
28	Breitenbach	30 GWh	4'304
29	Gretzenbach	29 GWh	2'800
30	Wolfwil	28 GWh	2'401
31	Deitingen	27 GWh	2'340
32	Erlinsbach	26 GWh	3'691
33	Mümliswil-Ramiswil	26 GWh	2'451
34	Lohn-Ammannsegg	25 GWh	2'976
35	Langendorf	24 GWh	3'858
36	Riedholz	24 GWh	2'313
37	Oberbuchsiten	23 GWh	2'386
38	Büsserach	22 GWh	2'431
39	Hofstetten-Flüh	22 GWh	3'401
40	Fulenbach	21 GWh	1'808
41	Messen	21 GWh	1'496
42	Kappel	20 GWh	3'511
43	Kestenholz	20 GWh	1'881
44	Gunzgen	20 GWh	1'712
45	Laupersdorf	19 GWh	1'897
46	Nunningen	18 GWh	1'973
47	Recherswil	18 GWh	2'180
48	Matzendorf	18 GWh	1'374
49	Lüsslingen-Nennigkofen	16 GWh	1'140
50	Obergösgen	16 GWh	2'457
51	Oberdorf	16 GWh	1'859
52	Winznau	16 GWh	2'058
53	Schnottwil	15 GWh	1'150
54	Kleinlützel	14 GWh	1'197
55	Lommiswil	14 GWh	1'630
56	Welschenrohr-Gänsbrunnen	14 GWh	1'205
57	Niederbuchsiten	14 GWh	1'301
58	Rickenbach	13 GWh	1'198
59	Obergerlafingen	13 GWh	1'262
60	Stüsslingen	13 GWh	1'257
61	Hochwald	13 GWh	1'266
62	Seewen	13 GWh	1'064
63	Witterswil	12 GWh	1'467
64	Aeschi	12 GWh	1'329
65	Nuglar-St. Pantaleon	12 GWh	1'546
66	Rüttenen	12 GWh	1'541
67	Walterswil	11 GWh	749
68	Etziken	11 GWh	1'070
69	Kriegstetten	11 GWh	1'427
70	Günsberg	11 GWh	1'185
71	Rodersdorf	11 GWh	1'418
72	Metzerlen-Mariastein	11 GWh	973
73	Bättwil	11 GWh	1'191
74	Flumenthal	10 GWh	1'043
75	Lüterkofen-Ichertswil	10 GWh	904
76	Starrkirch-Wil	10 GWh	1'956
77	Gempen	9 GWh	932
78	Büren	9 GWh	1'055
79	Boningen	9 GWh	807
80	Aedermannsdorf	9 GWh	599
81	Horriwil	9 GWh	911
82	Drei Höfe	8 GWh	742
83	Himmelried	8 GWh	977
84	Halten	8 GWh	854
85	Kienberg	8 GWh	528
86	Oekingen	8 GWh	868
87	Holderbank	7 GWh	753
88	Bärschwil	7 GWh	794
89	Erschwil	7 GWh	960
90	Feldbrunnen-St. Niklaus	7 GWh	1'027
91	Herbetswil	7 GWh	605
92	Zullwil	6 GWh	675
93	Hubersdorf	6 GWh	717
94	Eppenberg-Wöschnau	5 GWh	326
95	Beinwil	5 GWh	274
96	Biezwil	5 GWh	354
97	Bolken	5 GWh	593
98	Meltingen	5 GWh	645
99	Wisen	5 GWh	443
100	Fehren	4 GWh	595
101	Hauenstein-Ifenthal	4 GWh	325
102	Grindel	4 GWh	517
103	Unterramsern	3 GWh	220
104	Balm bei Günsberg	3 GWh	226
105	Hüniken	2 GWh	160
106	Kammersrohr	1 GWh	31

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 Solothurn has the greatest solar potential?: Grenchen, whose roofs could generate about 115 GWh of electricity a year (2025) — the greatest modelled roof potential of any municipality in canton Solothurn.
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.