diff --git a/premise/clean_datasets.py b/premise/clean_datasets.py
index d6b1dc46..7536e08f 100644
--- a/premise/clean_datasets.py
+++ b/premise/clean_datasets.py
@@ -40,11 +40,10 @@ def remove_uncertainty(database):
 
     for dataset in database:
         for exchange in dataset["exchanges"]:
-            if not exchange.get("preserve uncertainty", False):
-                exchange["uncertainty type"] = 0
-                exchange["loc"] = exchange["amount"]
-                for key in uncertainty_keys:
-                    exchange[key] = nan_value
+            exchange["uncertainty type"] = 0
+            exchange["loc"] = exchange["amount"]
+            for key in uncertainty_keys:
+                exchange[key] = nan_value
 
     return database
 
diff --git a/premise/data/additional_inventories/lci-hydrogen-electrolysis.xlsx b/premise/data/additional_inventories/lci-hydrogen-electrolysis.xlsx
index c43bcb8a..73ad2515 100644
Binary files a/premise/data/additional_inventories/lci-hydrogen-electrolysis.xlsx and b/premise/data/additional_inventories/lci-hydrogen-electrolysis.xlsx differ
diff --git a/premise/data/fuels/hydrogen_efficiency_parameters.yml b/premise/data/fuels/hydrogen_efficiency_parameters.yml
index 7a1f3590..98924b53 100644
--- a/premise/data/fuels/hydrogen_efficiency_parameters.yml
+++ b/premise/data/fuels/hydrogen_efficiency_parameters.yml
@@ -3,7 +3,7 @@ from electrolysis:
   var: hydrogen, from electrolysis
   feedstock name: electricity, low voltage
   feedstock unit: kilowatt hour
-  floor value: 48.0
+  floor value: 48.9
 from SMR of biogas, with CCS:
   name: hydrogen production, steam methane reforming, from biomethane, with CCS
   var: hydrogen, from biogas, with CCS
diff --git a/premise/external.py b/premise/external.py
index 87391dc5..90820dc5 100644
--- a/premise/external.py
+++ b/premise/external.py
@@ -3,6 +3,7 @@
 """
 
 import logging
+import math
 import uuid
 from collections import defaultdict
 from functools import lru_cache
@@ -1461,6 +1462,19 @@ def relink_to_new_datasets(
                 if isinstance(new_loc, str):
                     new_loc = [(new_loc, 1.0)]
 
+                def redefine_loc(e):
+                    if e.get("uncertainty type") in [0, 3, 4]:
+                        return e["amount"] * ratio * share
+
+                    elif e.get("uncertainty type") == 5:
+                        return e.get("loc", 0) * (e["amount"] * ratio * share / e["amount"])
+
+                    elif e.get("uncertainty type") == 2:
+                        return math.log(e["amount"] * ratio * share)
+
+                    else:
+                        return None
+
                 if len(new_loc) > 0:
                     for loc, share in new_loc:
                         # add new exchange
@@ -1472,6 +1486,11 @@ def relink_to_new_datasets(
                                 "location": loc,
                                 "name": new_name,
                                 "product": new_ref,
+                                "uncertainty type": exc.get("uncertainty type", 0),
+                                "loc": redefine_loc(exc),
+                                "scale": exc.get("scale", 0) if "scale" in exc else None,
+                                "minimum": exc.get("minimum", 0) * (exc["amount"] * ratio * share / exc["amount"]) if "minimum" in exc else None,
+                                "maximum": exc.get("maximum", 0) * (exc["amount"] * ratio * share / exc["amount"]) if "maximum" in exc else None,
                             }
                         )
 
diff --git a/premise/transformation.py b/premise/transformation.py
index c71443c0..3d5b7a89 100644
--- a/premise/transformation.py
+++ b/premise/transformation.py
@@ -7,6 +7,7 @@
 
 import copy
 import logging.config
+import math
 import uuid
 from collections import defaultdict
 from collections.abc import ValuesView
@@ -46,6 +47,20 @@
 logger = logging.getLogger("module")
 
 
+def redefine_loc(e):
+    if e.get("uncertainty type") in [0, 3, 4]:
+        return e["amount"]
+
+    elif e.get("uncertainty type") == 5:
+        return e["amount"]
+
+    elif e.get("uncertainty type") == 2:
+        return math.log(e["amount"])
+
+    else:
+        return None
+
+
 def get_suppliers_of_a_region(
     database: List[dict],
     locations: List[str],
@@ -1066,16 +1081,8 @@ def relink_datasets(self, excludes_datasets=None, alt_names=None):
                             (exc["name"], exc.get("product"), exc["unit"])
                         ] = {
                             "uncertainty type": exc.get("uncertainty type", 0),
-                            "loc": (
-                                exc.get("loc", 0) / exc["amount"]
-                                if exc.get("loc", None) is not None
-                                else None
-                            ),
-                            "scale": (
-                                exc.get("scale", 0) / exc["amount"]
-                                if exc.get("scale", None) is not None
-                                else None
-                            ),
+                            "loc": redefine_loc(exc) if exc.get("loc") else None,
+                            "scale": exc.get("scale"),
                             "minimum": (
                                 exc.get("minimum", 0) / exc["amount"]
                                 if exc.get("minimum", None) is not None
@@ -1124,6 +1131,7 @@ def relink_datasets(self, excludes_datasets=None, alt_names=None):
                         exc["uncertainty type"] = old_uncertainty[key][
                             "uncertainty type"
                         ]
+                        #TODO: fix this
                         for k, v in old_uncertainty[key].items():
                             if k != "uncertainty type":
                                 if v is not None: