diff --git a/src/geophires_x/Economics.py b/src/geophires_x/Economics.py
index b6ac89629..629bbe124 100644
--- a/src/geophires_x/Economics.py
+++ b/src/geophires_x/Economics.py
@@ -966,8 +966,15 @@ def __init__(self, model: Model):
             ErrMessage="assume default well drilling cost correlation (10)",
             ToolTipText="Select the built-in well drilling and completion cost correlation: " +
                         '; '.join([f'{it.int_value}: {it.value}' for it in WellDrillingCostCorrelation])
+                        # TODO citation(s):
+                        # Akindipe, D. and Witter. E. 2025.
+                        #   "2025 Geothermal Drilling Cost Curves Update".
+                        #   https://pangea.stanford.edu/ERE/db/GeoConf/papers/SGW/2025/Akindipe.pdf?t=1740084555
+                        #
+                        # Robins, J.C., Kesseli, D., Witter, E. and Rhodes, G. 2022.
+                        #   "2022 GETEM Geothermal Drilling Cost Curve Update."
+                        #   https://www.nrel.gov/docs/fy23osti/82771.pdf
         )
-
         self.DoAddOnCalculations = self.ParameterDict[self.DoAddOnCalculations.Name] = boolParameter(
             "Do AddOn Calculations",
             DefaultValue=False,
diff --git a/src/geophires_x/OptionList.py b/src/geophires_x/OptionList.py
index cf41570ab..d18fa9144 100644
--- a/src/geophires_x/OptionList.py
+++ b/src/geophires_x/OptionList.py
@@ -157,14 +157,24 @@ def from_input_string(input_string:str):
 
 
 class WellDrillingCostCorrelation(GeophiresInputEnum):
-    """Note: order must be retained since input is read as an int; first int arg is duplicative of order"""
+    """
+    Akindipe, D. and Witter. E. 2025.
+        "2025 Geothermal Drilling Cost Curves Update".
+        https://pangea.stanford.edu/ERE/db/GeoConf/papers/SGW/2025/Akindipe.pdf?t=1740084555
+
+    Robins, J.C., Kesseli, D., Witter, E. and Rhodes, G. 2022.
+        "2022 GETEM Geothermal Drilling Cost Curve Update."
+        https://www.nrel.gov/docs/fy23osti/82771.pdf
+
+    Note: order should be retained since input is read as an int; first int arg is duplicative of order
+    """
 
-    VERTICAL_SMALL = 1, "vertical small diameter, baseline", 0.30212, 584.91124, 751368.47270
-    DEVIATED_SMALL = 2, "deviated small diameter, baseline", 0.28977, 882.15067, 680562.50150
-    VERTICAL_LARGE = 3, "vertical large diameter, baseline", 0.28180, 1275.52130, 632315.12640
-    DEVIATED_LARGE = 4, "deviated large diameter, baseline", 0.25528, 1716.71568, 500866.89110
+    VERTICAL_SMALL = 1, "vertical small diameter, baseline (2025 cost curve)", 0.258496, 357.967, 738531.58
+    DEVIATED_SMALL = 2, "deviated small diameter, baseline (2025 cost curve)", 0.240624, 646.1621, 503625.06
+    VERTICAL_LARGE = 3, "vertical large diameter, baseline (2025 cost curve)", 0.248458, 935.8985, 626586.68
+    DEVIATED_LARGE = 4, "deviated large diameter, baseline (2025 cost curve)", 0.217333, 1362.93, 301066.16
 
-    SIMPLE = 5, "Simple", 0, 1846*1E6, 0 # Based on Fervo Project Cape cost per meter (~$1846/m)
+    SIMPLE = 5, "Simple", 0, 1846*1E6, 0  # Based on Fervo Project Cape cost per meter (~$1846/m)
 
     VERTICAL_SMALL_INT1 = 6, "vertical small diameter, intermediate1", 0.13710, 129.61033, 1205587.57100
     VERTICAL_SMALL_INT2 = 7, "vertical small diameter, intermediate2", 0.00804, 455.60507, 921007.68680