diff --git a/src/core/utils.jl b/src/core/utils.jl
index aa99b3c71..3001cb201 100644
--- a/src/core/utils.jl
+++ b/src/core/utils.jl
@@ -164,6 +164,7 @@ function dictkeys_tosymbols(d::Dict)
             "emissions_factor_series_lb_NOx_per_kwh", 
             "emissions_factor_series_lb_SO2_per_kwh",
             "emissions_factor_series_lb_PM25_per_kwh",
+            "renewable_energy_fraction_series",
             "heating_cop_reference",
             "heating_cf_reference",
             "heating_reference_temps_degF",