Strong imports and a summer surplus, coupled with an ambitious build-out of solar and hydro
Cost-minimal solution
This scenario seeks cost-minimal solution for energy system
Imports increase
In spite of solar and hydro build-out import dependency will increase
Solar build-out, accelerating 2040
Solar build-out with focus on roof-top, limited addition of alpine PV
10% increase in hydro
Hydro production is increased by 10% until 2040
Decomissioning end 2043
Nuclear plants are run close to 60 years, 2043 is last productive year of Leibstadt plant
Energy Mix Year
Production
Demand
Production
2025
Total generation 72 TWh
2050
Total generation 84 TWh
Demand
2025
Total demand 64 TWh
2050
Total demand 77 TWh
2050 Year
Transition Year
The energy mix as we transition to 2050
Demand
Import
Storage reserve used
PV
Wind
Hydro
Biomass
Nuclear
Fossil
2025Year
TWh
Demand
63.8
Generation
72.3
Deficit
--
Import
--
Import
--
Import atget exceeded
--
Generation
72.3
Storage reserve used
--
PV
9.1
PV Roof
8
PV Alpine
1.1
PV Ground
--
Wind
0.1
Hydro
36.6
Run-of-River
18.6
Storage
18.1
Biomass
2.9
Biomass
2.9
CCS Biomass
--
Gas
--
Market-Gas
--
Reserve gas power plants
--
Geothermal
--
Nuclear
23
Nuclear
23
New nuclear
--
Fossil
0.6
Existing fossil fuel power plants
0.6
CCS Fossil Fuels
--
Hard coal
--
Challenges
Import target exceeded
The energy law sets a non-binding 5 TWh import target, which will be exceeded in 2038 - 2050.
High Import Dependency
Rising import needs after nuclear decomissioning require neighbor surplus and EU agreement
Not much spare capacity
Higher risk for blackouts as cost-minimizing leads to little spare capacity
Public opinion
Public opinion needs to accept more hydro plants and higher dams
High summer surplus
Summer surplus rises from 9 to 18 TWh in 2050. Unclear how much of it can be exported.
Additional costs possible
If summer surplus cannot be exported, the costs per MWh would rise
Costs
Total Costs, Revenues and Subsidies in CHF until 2050.
Total production costs
232billion
Accumulated until 2050
Revenues
195billion
Assuming an average power price of 75 CHF/MWn
Subsidies required
36billion
Remaining costs not covered by revenues
Average cost
8.3billion / year
The annual average of the total cost, 8.3 bn CHF per year, is less than 2% of the (estimated) Swiss GDP in 2024 (825 bn. CHF).
Levelized cost
We use Levelized costs of electricity (LCOE). Future costs may rise as cheaper plants are replaced. High demand and costly technologies like rooftop PV can further increase costs. See Expert Mode for details on technology costs.
2020s
2030s
2040s
Levelized cost (LCOE) ⌀ CHF/MWh
About the scenario developer
ETH Energy Science Center
The Energy Science Center at ETH Zurich is a research hub for interdisciplinary energy studies.Its integrated modeling framework "Nexus-e" enables researchers to simulate and analyze energy system scenarios, helping to guide Switzerland’s energy transition.
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