diff --git a/config/config.validation.yaml b/config/config.validation.yaml
index 556442f8..afb53d37 100644
--- a/config/config.validation.yaml
+++ b/config/config.validation.yaml
@@ -32,7 +32,7 @@ scenario:
   opts: # only relevant for PyPSA-Eur
   - 'ept'
   sector_opts: # this is where the main scenario settings are
-  - Co2L0-3H-T-H-B-I-A-solar+p3-dist1
+  - Co2L0-1H-T-H-B-I-A-solar+p3-dist1
   # to really understand the options here, look in scripts/prepare_sector_network.py
   # Co2Lx specifies the CO2 target in x% of the 1990 values; default will give default (5%);
   # Co2L0p25 will give 25% CO2 emissions; Co2Lm0p05 will give 5% negative emissions
@@ -334,7 +334,7 @@ solar_thermal:
 
 # only relevant for foresight = myopic or perfect
 existing_capacities:
-  unit_commitment: false  # if unit commitment (UC) for conventional power plants is used
+  unit_commitment: true  # if unit commitment (UC) for conventional power plants is used
   # UC is only applied to extendable plants if  linearized UC is used
   grouping_years_power: [1980, 1985, 1990, 1995, 2000, 2005, 2010, 2015, 2020, 2025, 2030]
   grouping_years_heat: [1980, 1985, 1990, 1995, 2000, 2005, 2010, 2015, 2019] # these should not extend 2020