diff --git a/.github/actions/install_requirements/action.yml b/.github/actions/install_requirements/action.yml
index 25a146d1..c553af22 100644
--- a/.github/actions/install_requirements/action.yml
+++ b/.github/actions/install_requirements/action.yml
@@ -36,9 +36,9 @@ runs:
       shell: bash
 
     - name: Upload lockfiles
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: lockfiles
+        name: lockfiles_${{ github.job }}_${{ matrix.python }}
         path: lockfiles
 
     # This eliminates the class of problems where the requirements being given no
diff --git a/.github/workflows/code.yml b/.github/workflows/code.yml
index 8e440c67..84f84584 100644
--- a/.github/workflows/code.yml
+++ b/.github/workflows/code.yml
@@ -32,7 +32,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"] # can add windows-latest, macos-latest
-        python: ["3.7", "3.9", "3.10"]
+        python: ["3.9", "3.10"]
         install: ["-e .[dev]"]
         # Make one version be non-editable to test both paths of version code
         include:
@@ -88,9 +88,9 @@ jobs:
           pipx run build
 
       - name: Upload sdist and wheel as artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: dist
+          name: dist_${{ github.job }}_${{ matrix.python }}
           path: dist
 
       - name: Check for packaging errors
@@ -124,7 +124,7 @@ jobs:
         run: echo IMAGE_REPOSITORY=ghcr.io/$(tr '[:upper:]' '[:lower:]' <<< "${{ github.repository }}") >> $GITHUB_ENV
 
       - name: Download wheel and lockfiles
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           path: artifacts/
 
@@ -153,7 +153,7 @@ jobs:
         uses: docker/build-push-action@v3
         with:
           build-args: |
-            PIP_OPTIONS=-r lockfiles/requirements.txt dist/*.whl
+            PIP_OPTIONS=-r lockfiles_dist_/requirements.txt dist_dist_/*.whl
           push: ${{ github.event_name == 'push' && startsWith(github.ref, 'refs/tags') }}
           load: ${{ ! (github.event_name == 'push' && startsWith(github.ref, 'refs/tags')) }}
           tags: ${{ steps.meta.outputs.tags }}
@@ -177,11 +177,11 @@ jobs:
       HAS_PYPI_TOKEN: ${{ secrets.PYPI_TOKEN != '' }}
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
 
       - name: Fixup blank lockfiles
         # Github release artifacts can't be blank
-        run: for f in lockfiles/*; do [ -s $f ] || echo '# No requirements' >> $f; done
+        run: for f in lockfiles_dist_/*; do [ -s $f ] || echo '# No requirements' >> $f; done
 
       - name: Github Release
         # We pin to the SHA, not the tag, for security reasons.
@@ -190,8 +190,8 @@ jobs:
         with:
           prerelease: ${{ contains(github.ref_name, 'a') || contains(github.ref_name, 'b') || contains(github.ref_name, 'rc') }}
           files: |
-            dist/*
-            lockfiles/*
+            dist_dist_/*
+            lockfiles_dist_/*
           generate_release_notes: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/src/pytac/data/DIAD/simple_devices.csv b/src/pytac/data/DIAD/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/DIAD/simple_devices.csv
+++ b/src/pytac/data/DIAD/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/DIAD/uc_poly_data.csv b/src/pytac/data/DIAD/uc_poly_data.csv
index 26ebb12e..576523da 100644
--- a/src/pytac/data/DIAD/uc_poly_data.csv
+++ b/src/pytac/data/DIAD/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/DIAD/unitconv.csv b/src/pytac/data/DIAD/unitconv.csv
index e69a7f55..2017dae5 100644
--- a/src/pytac/data/DIAD/unitconv.csv
+++ b/src/pytac/data/DIAD/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1492,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/DIADSP/simple_devices.csv b/src/pytac/data/DIADSP/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/DIADSP/simple_devices.csv
+++ b/src/pytac/data/DIADSP/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/DIADSP/uc_poly_data.csv b/src/pytac/data/DIADSP/uc_poly_data.csv
index 26ebb12e..576523da 100644
--- a/src/pytac/data/DIADSP/uc_poly_data.csv
+++ b/src/pytac/data/DIADSP/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/DIADSP/unitconv.csv b/src/pytac/data/DIADSP/unitconv.csv
index e69a7f55..2017dae5 100644
--- a/src/pytac/data/DIADSP/unitconv.csv
+++ b/src/pytac/data/DIADSP/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1492,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/DIADTHz/simple_devices.csv b/src/pytac/data/DIADTHz/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/DIADTHz/simple_devices.csv
+++ b/src/pytac/data/DIADTHz/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/DIADTHz/uc_poly_data.csv b/src/pytac/data/DIADTHz/uc_poly_data.csv
index 26ebb12e..576523da 100644
--- a/src/pytac/data/DIADTHz/uc_poly_data.csv
+++ b/src/pytac/data/DIADTHz/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/DIADTHz/unitconv.csv b/src/pytac/data/DIADTHz/unitconv.csv
index e69a7f55..2017dae5 100644
--- a/src/pytac/data/DIADTHz/unitconv.csv
+++ b/src/pytac/data/DIADTHz/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1492,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/I04/simple_devices.csv b/src/pytac/data/I04/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/I04/simple_devices.csv
+++ b/src/pytac/data/I04/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/I04/uc_poly_data.csv b/src/pytac/data/I04/uc_poly_data.csv
index 779c4447..79e2299a 100644
--- a/src/pytac/data/I04/uc_poly_data.csv
+++ b/src/pytac/data/I04/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/I04/unitconv.csv b/src/pytac/data/I04/unitconv.csv
index 748170a5..ab7a84c3 100644
--- a/src/pytac/data/I04/unitconv.csv
+++ b/src/pytac/data/I04/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1510,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/I04SP/simple_devices.csv b/src/pytac/data/I04SP/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/I04SP/simple_devices.csv
+++ b/src/pytac/data/I04SP/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/I04SP/uc_poly_data.csv b/src/pytac/data/I04SP/uc_poly_data.csv
index 779c4447..79e2299a 100644
--- a/src/pytac/data/I04SP/uc_poly_data.csv
+++ b/src/pytac/data/I04SP/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/I04SP/unitconv.csv b/src/pytac/data/I04SP/unitconv.csv
index 748170a5..ab7a84c3 100644
--- a/src/pytac/data/I04SP/unitconv.csv
+++ b/src/pytac/data/I04SP/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1510,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/I04THz/simple_devices.csv b/src/pytac/data/I04THz/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/I04THz/simple_devices.csv
+++ b/src/pytac/data/I04THz/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/I04THz/uc_poly_data.csv b/src/pytac/data/I04THz/uc_poly_data.csv
index 779c4447..79e2299a 100644
--- a/src/pytac/data/I04THz/uc_poly_data.csv
+++ b/src/pytac/data/I04THz/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/I04THz/unitconv.csv b/src/pytac/data/I04THz/unitconv.csv
index 748170a5..ab7a84c3 100644
--- a/src/pytac/data/I04THz/unitconv.csv
+++ b/src/pytac/data/I04THz/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1510,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/SRI0913_MOGA/simple_devices.csv b/src/pytac/data/SRI0913_MOGA/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/SRI0913_MOGA/simple_devices.csv
+++ b/src/pytac/data/SRI0913_MOGA/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/SRI0913_MOGA/uc_poly_data.csv b/src/pytac/data/SRI0913_MOGA/uc_poly_data.csv
index 26ebb12e..576523da 100644
--- a/src/pytac/data/SRI0913_MOGA/uc_poly_data.csv
+++ b/src/pytac/data/SRI0913_MOGA/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/SRI0913_MOGA/unitconv.csv b/src/pytac/data/SRI0913_MOGA/unitconv.csv
index e69a7f55..2017dae5 100644
--- a/src/pytac/data/SRI0913_MOGA/unitconv.csv
+++ b/src/pytac/data/SRI0913_MOGA/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1492,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/VMX/simple_devices.csv b/src/pytac/data/VMX/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/VMX/simple_devices.csv
+++ b/src/pytac/data/VMX/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/VMX/uc_poly_data.csv b/src/pytac/data/VMX/uc_poly_data.csv
index c1632fe0..eaf31e7a 100644
--- a/src/pytac/data/VMX/uc_poly_data.csv
+++ b/src/pytac/data/VMX/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/VMX/unitconv.csv b/src/pytac/data/VMX/unitconv.csv
index 559357cb..05397d82 100644
--- a/src/pytac/data/VMX/unitconv.csv
+++ b/src/pytac/data/VMX/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1490,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/VMXSP/simple_devices.csv b/src/pytac/data/VMXSP/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/VMXSP/simple_devices.csv
+++ b/src/pytac/data/VMXSP/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/VMXSP/uc_poly_data.csv b/src/pytac/data/VMXSP/uc_poly_data.csv
index c1632fe0..eaf31e7a 100644
--- a/src/pytac/data/VMXSP/uc_poly_data.csv
+++ b/src/pytac/data/VMXSP/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/VMXSP/unitconv.csv b/src/pytac/data/VMXSP/unitconv.csv
index 559357cb..05397d82 100644
--- a/src/pytac/data/VMXSP/unitconv.csv
+++ b/src/pytac/data/VMXSP/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1490,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/VMXTHz/simple_devices.csv b/src/pytac/data/VMXTHz/simple_devices.csv
index 82423fcf..5c07eb33 100644
--- a/src/pytac/data/VMXTHz/simple_devices.csv
+++ b/src/pytac/data/VMXTHz/simple_devices.csv
@@ -1,2 +1,2 @@
 el_id,field,value,readonly
-0,energy,3000000000,True
+0,energy,3000,True
diff --git a/src/pytac/data/VMXTHz/uc_poly_data.csv b/src/pytac/data/VMXTHz/uc_poly_data.csv
index c1632fe0..eaf31e7a 100644
--- a/src/pytac/data/VMXTHz/uc_poly_data.csv
+++ b/src/pytac/data/VMXTHz/uc_poly_data.csv
@@ -1,6 +1,6 @@
 uc_id,coeff,val
 1,0,0.000000
-1,1,1e-06
+1,1,1e06
 2,0,0.000000
 2,1,1e-09
 3,0,0.000000
diff --git a/src/pytac/data/VMXTHz/unitconv.csv b/src/pytac/data/VMXTHz/unitconv.csv
index 559357cb..05397d82 100644
--- a/src/pytac/data/VMXTHz/unitconv.csv
+++ b/src/pytac/data/VMXTHz/unitconv.csv
@@ -4,7 +4,7 @@ el_id,field,uc_type,uc_id,phys_units,eng_units,lower_lim,upper_lim
 0,dispersion,null,0,m,m,,
 0,beam_current,null,0,A,A,,
 1490,f,null,0,Hz,Hz,,
-0,energy,poly,1,Gev,Mev,,
+0,energy,poly,1,eV,MeV,,
 0,emittance_x,poly,2,m,nm,,
 0,emittance_y,poly,3,m,pm,,
 5,b1,pchip,4,m^-2,A,0,200
diff --git a/src/pytac/data/utils/load_mml.m b/src/pytac/data/utils/load_mml.m
index 0d5514a0..a1f82085 100644
--- a/src/pytac/data/utils/load_mml.m
+++ b/src/pytac/data/utils/load_mml.m
@@ -43,7 +43,7 @@ function load_mml(ringmode)
     ao = getao();
 
     % Hard-coded beam energy value.
-    fprintf(f_simple_devices, '0,energy,3e9,True\n');
+    fprintf(f_simple_devices, '0,energy,3000,True\n');
 
     % The individual BPM PVs are not stored in middlelayer.
     BPMS = get_bpm_pvs(ao);
diff --git a/src/pytac/data/utils/load_unitconv.m b/src/pytac/data/utils/load_unitconv.m
index d201e0b0..3a71e86e 100644
--- a/src/pytac/data/utils/load_unitconv.m
+++ b/src/pytac/data/utils/load_unitconv.m
@@ -48,9 +48,9 @@ function load_unitconv(ringmode, renamedIndexes)
 % Unit conversions for lattice fields
 % the conversion limits are '' as these fields don't have a Setpoint field
 uc_id = uc_id + 1;
-fprintf(f_units, '%d,%s,poly,%d,%s,%s,%s,%s\n', 0, 'energy', uc_id, 'Gev', 'Mev', '', '');
+fprintf(f_units, '%d,%s,poly,%d,%s,%s,%s,%s\n', 0, 'energy', uc_id, 'eV', 'MeV', '', '');
 fprintf(f_poly, '%d,%d,%f\n', uc_id, 0, 0);
-fprintf(f_poly, '%d,%d,%g\n', uc_id, 1, 1e-6);
+fprintf(f_poly, '%d,%d,%g\n', uc_id, 1, 1e6);
 uc_id = uc_id + 1;
 fprintf(f_units, '%d,%s,poly,%d,%s,%s,%s,%s\n', 0, 'emittance_x', uc_id, 'm', 'nm', '', '');
 fprintf(f_poly, '%d,%d,%f\n', uc_id, 0, 0);
diff --git a/src/pytac/lattice.py b/src/pytac/lattice.py
index 033ca142..bbd1bfbb 100644
--- a/src/pytac/lattice.py
+++ b/src/pytac/lattice.py
@@ -1,5 +1,5 @@
 """Representation of a lattice object which contains all the elements of the
-    machine.
+machine.
 """
 
 import logging
diff --git a/src/pytac/load_csv.py b/src/pytac/load_csv.py
index 2bb8b4c9..0cb19055 100644
--- a/src/pytac/load_csv.py
+++ b/src/pytac/load_csv.py
@@ -16,8 +16,9 @@
 import copy
 import csv
 import logging
+import os
 from pathlib import Path
-from typing import Dict, Iterator
+from typing import Dict, Iterator, Set
 
 import pytac
 from pytac import data_source, element, utils
@@ -166,7 +167,7 @@ def load_unitconv(mode_dir: Path, lattice: Lattice) -> None:
                 # TODO: This should probably be moved into the .csv files somewhere.
                 rigidity_families = {"hstr", "vstr", "quadrupole", "sextupole", "bend"}
                 if item["uc_type"] != "null" and element._families & rigidity_families:
-                    energy = lattice.get_value("energy", units=pytac.PHYS)
+                    energy = lattice.get_value("energy", units=pytac.ENG)
                     uc.set_post_eng_to_phys(utils.get_div_rigidity(energy))
                     uc.set_pre_phys_to_eng(utils.get_mult_rigidity(energy))
                 element.set_unitconv(item["field"], uc)
@@ -263,3 +264,35 @@ def load(mode, control_system=None, directory=None, symmetry=None) -> EpicsLatti
     if unitconv_file.exists():
         load_unitconv(mode_dir, lat)
     return lat
+
+
+def available_ringmodes(directory=None) -> Set[str]:
+    """Return the possible ringmodes based on the subdirectories and files in
+    the given directory.
+
+    .. Note:: It is not guaranteed that the modes returned will be able to be
+       successfully loaded due to errors, missing data, etc. I.e., any mode
+       that can be loaded will always be returned, but modes that can't be
+       loaded might also sometimes be returned.
+
+    Args:
+        directory (str): The data directory to check inside. If no directory
+                          is given the default data directory location is used.
+
+    Returns:
+        set[str]: A set of possible ringmodes.
+
+    Raises:
+        OSError: if no ringmodes can be found in the specified directory.
+    """
+    if directory is None:
+        directory = Path(__file__).resolve().parent / "data"
+    modes = set()
+    for directory_object in os.scandir(directory):
+        if directory_object.is_dir():
+            contents = os.listdir(directory_object.path)
+            if ELEMENTS_FILENAME in contents and FAMILIES_FILENAME in contents:
+                modes.add(directory_object.name)
+    if not modes:
+        raise OSError(f"No ringmodes found in {os.path.realpath(directory)}")
+    return modes
diff --git a/tests/test_load.py b/tests/test_load.py
index b7d91381..eb82bb1d 100644
--- a/tests/test_load.py
+++ b/tests/test_load.py
@@ -1,10 +1,11 @@
+from pathlib import Path
 from unittest.mock import patch
 
 import pytest
 from testfixtures import LogCapture
 
 import pytac
-from pytac.load_csv import load, load_unitconv, resolve_unitconv
+from pytac.load_csv import available_ringmodes, load, load_unitconv, resolve_unitconv
 
 
 @pytest.fixture
@@ -130,3 +131,24 @@ def test_resolve_unitconv_raises_UnitsException_if_unrecognised_UnitConv_type(
     }
     with pytest.raises(pytac.exceptions.UnitsException):
         resolve_unitconv(uc_params, {}, polyconv_file, pchipconv_file)
+
+
+def test_available_ringmodes():
+    ringmodes = {
+        "SRI0913_MOGA",
+        "I04",
+        "VMX",
+        "DIAD",
+        "VMXSP",
+        "VMXTHz",
+        "DIADSP",
+        "DIADTHz",
+        "I04SP",
+        "I04THz",
+    }
+    assert available_ringmodes() == ringmodes
+    bad_path = Path(__file__).resolve().parent.parent
+    with pytest.raises(OSError):
+        available_ringmodes(bad_path)
+    good_path = bad_path / "src/pytac/data"
+    assert available_ringmodes(good_path) == ringmodes
diff --git a/tests/test_machine.py b/tests/test_machine.py
index 14b7c001..6581499d 100644
--- a/tests/test_machine.py
+++ b/tests/test_machine.py
@@ -1,6 +1,6 @@
-""" This file tests the entire loading of the DLS machine from the CSV
-    files in the data directory. These are more like integration tests,
-    and allows us to check that the pytac setup is working correctly.
+"""This file tests the entire loading of the DLS machine from the CSV
+files in the data directory. These are more like integration tests,
+and allows us to check that the pytac setup is working correctly.
 """
 
 import re