In some (or all, I don't know) datasets of RES PP (ego_dp_supply_res_powerplant), voltage level_var is different from voltage_level (in all scenarios).
E.g. geno id=902876 says "07 (NS)" and "6"...
SELECT *
FROM model_draft.ego_dp_supply_res_powerplant
WHERE id = 902876;
How come?