diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f0cdfca1..c2be3909 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -19,7 +19,6 @@ on:
   - cron: "0 5 * * TUE"
 
 env:
-  CONDA_CACHE_NUMBER: 1 # Change this value to manually reset the environment cache
   DATA_CACHE_NUMBER: 2
 
 jobs:
@@ -27,22 +26,12 @@ jobs:
 
     strategy:
       fail-fast: false
+      max-parallel: 3
       matrix:
-        include:
-          # Matrix required to handle caching with Mambaforge
-        - os: ubuntu-latest
-          label: ubuntu-latest
-          prefix: /usr/share/miniconda3/envs/pypsa-eur
-
-        - os: macos-latest
-          label: macos-latest
-          prefix: /Users/runner/miniconda3/envs/pypsa-eur
-
-        - os: windows-latest
-          label: windows-latest
-          prefix: C:\Miniconda3\envs\pypsa-eur
-
-    name: ${{ matrix.label }}
+        os:
+        - ubuntu-latest
+        - macos-latest
+        - windows-latest
 
     runs-on: ${{ matrix.os }}
 
@@ -60,24 +49,25 @@ jobs:
     - name: Add solver to environment
       run: |
         echo -e "- glpk\n- ipopt<3.13.3" >> envs/environment.yaml
-      if: ${{ matrix.label }} == 'windows-latest'
+      if: ${{ matrix.os }} == 'windows-latest'
 
     - name: Add solver to environment
       run: |
         echo -e "- glpk\n- ipopt" >> envs/environment.yaml
-      if: ${{ matrix.label }} != 'windows-latest'
+      if: ${{ matrix.os }} != 'windows-latest'
 
-    - name: Setup Mambaforge
-      uses: conda-incubator/setup-miniconda@v2
+    - name: Setup micromamba
+      uses: mamba-org/setup-micromamba@v1
       with:
-        miniforge-variant: Mambaforge
-        miniforge-version: latest
-        activate-environment: pypsa-eur
-        use-mamba: true
+        micromamba-version: latest
+        environment-file: envs/environment.yaml
+        log-level: debug
+        init-shell: bash
+        cache-environment: true
+        cache-downloads: true
 
     - name: Set cache dates
       run: |
-        echo "DATE=$(date +'%Y%m%d')" >> $GITHUB_ENV
         echo "WEEK=$(date +'%Y%U')" >> $GITHUB_ENV
 
     - name: Cache data and cutouts folders
@@ -88,21 +78,8 @@ jobs:
           cutouts
         key: data-cutouts-${{ env.WEEK }}-${{ env.DATA_CACHE_NUMBER }}
 
-    - name: Create environment cache
-      uses: actions/cache@v3
-      id: cache
-      with:
-        path: ${{ matrix.prefix }}
-        key: ${{ matrix.label }}-conda-${{ env.DATE }}-${{ env.CONDA_CACHE_NUMBER }}
-
-    - name: Update environment due to outdated or unavailable cache
-      run: mamba env update -n pypsa-eur -f envs/environment.yaml
-      if: steps.cache.outputs.cache-hit != 'true'
-
     - name: Test snakemake workflow
       run: |
-        conda activate pypsa-eur
-        conda list
         snakemake -call solve_elec_networks --configfile config/test/config.electricity.yaml --rerun-triggers=mtime
         snakemake -call all --configfile config/test/config.overnight.yaml --rerun-triggers=mtime
         snakemake -call all --configfile config/test/config.myopic.yaml --rerun-triggers=mtime
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6fb0dbf0..006673b9 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -87,6 +87,6 @@ repos:
 
   # Check for FSFE REUSE compliance (licensing)
 - repo: https://github.com/fsfe/reuse-tool
-  rev: v2.0.0
+  rev: v2.1.0
   hooks:
   - id: reuse
diff --git a/config/config.default.yaml b/config/config.default.yaml
index bf5156b9..7b4500ae 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -528,7 +528,7 @@ industry:
 # docs in https://pypsa-eur.readthedocs.io/en/latest/configuration.html#costs
 costs:
   year: 2030
-  version: v0.5.0
+  version: v0.6.0
   rooftop_share: 0.14  # based on the potentials, assuming  (0.1 kW/m2 and 10 m2/person)
   fill_values:
     FOM: 0
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 13027a8a..98b65737 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -280,13 +280,13 @@ def add_EQ_constraints(n, o, scaling=1e-1):
     float_regex = "[0-9]*\.?[0-9]+"
     level = float(re.findall(float_regex, o)[0])
     if o[-1] == "c":
-        ggrouper = n.generators.bus.map(n.buses.country).to_xarray()
-        lgrouper = n.loads.bus.map(n.buses.country).to_xarray()
-        sgrouper = n.storage_units.bus.map(n.buses.country).to_xarray()
+        ggrouper = n.generators.bus.map(n.buses.country)
+        lgrouper = n.loads.bus.map(n.buses.country)
+        sgrouper = n.storage_units.bus.map(n.buses.country)
     else:
-        ggrouper = n.generators.bus.to_xarray()
-        lgrouper = n.loads.bus.to_xarray()
-        sgrouper = n.storage_units.bus.to_xarray()
+        ggrouper = n.generators.bus
+        lgrouper = n.loads.bus
+        sgrouper = n.storage_units.bus
     load = (
         n.snapshot_weightings.generators
         @ n.loads_t.p_set.groupby(lgrouper, axis=1).sum()
@@ -300,7 +300,7 @@ def add_EQ_constraints(n, o, scaling=1e-1):
     p = n.model["Generator-p"]
     lhs_gen = (
         (p * (n.snapshot_weightings.generators * scaling))
-        .groupby(ggrouper)
+        .groupby(ggrouper.to_xarray())
         .sum()
         .sum("snapshot")
     )
@@ -309,7 +309,7 @@ def add_EQ_constraints(n, o, scaling=1e-1):
         spillage = n.model["StorageUnit-spill"]
         lhs_spill = (
             (spillage * (-n.snapshot_weightings.stores * scaling))
-            .groupby(sgrouper)
+            .groupby(sgrouper.to_xarray())
             .sum()
             .sum("snapshot")
         )