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.

Ranking · Data 2025 · Source: BFS

The greatest solar potential in canton Solothurn

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	18'973
2	Olten	105 GWh	19'265
3	Solothurn	96 GWh	16'830
4	Biberist	78 GWh	9'531
5	Oensingen	66 GWh	6'766
6	Zuchwil	60 GWh	9'622
7	Derendingen	50 GWh	7'219
8	Balsthal	49 GWh	6'622
9	Neuendorf	48 GWh	2'412
10	Bellach	48 GWh	5'632
11	Hägendorf	46 GWh	5'343
12	Gerlafingen	43 GWh	5'859
13	Däniken	43 GWh	3'108
14	Egerkingen	40 GWh	4'365
15	Buchegg	40 GWh	2'979
16	Dulliken	39 GWh	5'489
17	Luterbach	38 GWh	3'756
18	Dornach	38 GWh	6'898
19	Selzach	38 GWh	3'750
20	Wangen bei Olten	37 GWh	5'598
21	Bettlach	36 GWh	4'935
22	Schönenwerd	36 GWh	5'437
23	Härkingen	36 GWh	1'763
24	Trimbach	34 GWh	6'928
25	Lostorf	33 GWh	4'113
26	Niedergösgen	31 GWh	4'297
27	Subingen	31 GWh	3'311
28	Breitenbach	30 GWh	4'440
29	Gretzenbach	29 GWh	2'825
30	Wolfwil	28 GWh	2'473
31	Deitingen	27 GWh	2'409
32	Erlinsbach	26 GWh	3'761
33	Mümliswil-Ramiswil	26 GWh	2'472
34	Lohn-Ammannsegg	25 GWh	2'940
35	Langendorf	24 GWh	3'983
36	Riedholz	24 GWh	2'319
37	Oberbuchsiten	23 GWh	2'382
38	Büsserach	22 GWh	2'473
39	Hofstetten-Flüh	22 GWh	3'410
40	Fulenbach	21 GWh	1'841
41	Messen	21 GWh	1'506
42	Kappel	20 GWh	3'591
43	Kestenholz	20 GWh	1'888
44	Gunzgen	20 GWh	1'783
45	Laupersdorf	19 GWh	1'916
46	Nunningen	18 GWh	1'948
47	Recherswil	18 GWh	2'260
48	Matzendorf	18 GWh	1'439
49	Lüsslingen-Nennigkofen	16 GWh	1'131
50	Obergösgen	16 GWh	2'553
51	Oberdorf	16 GWh	1'806
52	Winznau	16 GWh	2'061
53	Schnottwil	15 GWh	1'159
54	Kleinlützel	14 GWh	1'190
55	Lommiswil	14 GWh	1'615
56	Welschenrohr-Gänsbrunnen	14 GWh	1'199
57	Niederbuchsiten	14 GWh	1'369
58	Rickenbach	13 GWh	1'208
59	Obergerlafingen	13 GWh	1'232
60	Stüsslingen	13 GWh	1'265
61	Hochwald	13 GWh	1'278
62	Seewen	13 GWh	1'088
63	Witterswil	12 GWh	1'475
64	Aeschi	12 GWh	1'342
65	Nuglar-St. Pantaleon	12 GWh	1'580
66	Rüttenen	12 GWh	1'498
67	Walterswil	11 GWh	768
68	Etziken	11 GWh	1'093
69	Kriegstetten	11 GWh	1'456
70	Günsberg	11 GWh	1'169
71	Rodersdorf	11 GWh	1'398
72	Metzerlen-Mariastein	11 GWh	970
73	Bättwil	11 GWh	1'185
74	Flumenthal	10 GWh	1'023
75	Lüterkofen-Ichertswil	10 GWh	923
76	Starrkirch-Wil	10 GWh	2'020
77	Gempen	9 GWh	919
78	Büren	9 GWh	1'060
79	Boningen	9 GWh	816
80	Aedermannsdorf	9 GWh	607
81	Horriwil	9 GWh	940
82	Drei Höfe	8 GWh	727
83	Himmelried	8 GWh	974
84	Kienberg	8 GWh	526
85	Holderbank	7 GWh	779
86	Bärschwil	7 GWh	806
87	Erschwil	7 GWh	996
88	Feldbrunnen-St. Niklaus	7 GWh	1'068
89	Herbetswil	7 GWh	617
90	Zullwil	6 GWh	704
91	Hubersdorf	6 GWh	727
92	Eppenberg-Wöschnau	5 GWh	336
93	Beinwil	5 GWh	248
94	Biezwil	5 GWh	345
95	Bolken	5 GWh	579
96	Meltingen	5 GWh	623
97	Wisen	5 GWh	451
98	Fehren	4 GWh	619
99	Hauenstein-Ifenthal	4 GWh	348
100	Grindel	4 GWh	508
101	Unterramsern	3 GWh	230
102	Balm bei Günsberg	3 GWh	213
103	Hüniken	2 GWh	160
104	Kammersrohr	1 GWh	32

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 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.