diff --git a/README.md b/README.md
index 84c32a4..f00782e 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ The LCIA Formatter v1 was peer-reviewed internally at USEPA and externally throu
 |ImpactWorld+ Endpoint*|International Reference Center for Life Cycle of Products, Services and Systems (CIRAIG)|[ImpactWorld+](http://www.impactworldplus.org/en/team.php)|
 |IPCC GWP|Intergovernmental Panel on Climate Change (IPCC)| |
 |FEDEFL Inventory Methods|US Environmental Protection Agency|[FEDEFL Inventory Methods](https://github.com/USEPA/LCIAformatter/wiki/Inventory-Methods)|
+|Cumulative Energy Demand|Federal LCA Commons|[FEDEFL Inventory Methods](https://github.com/USEPA/LCIAformatter/wiki/Inventory-Methods)|
 
 \* only works on Windows installations
 
diff --git a/lciafmt/__init__.py b/lciafmt/__init__.py
index 3843c40..5c9868f 100644
--- a/lciafmt/__init__.py
+++ b/lciafmt/__init__.py
@@ -13,6 +13,7 @@
 import pandas as pd
 
 import lciafmt.cache as cache
+import lciafmt.ced as ced
 import lciafmt.fmap as fmap
 import lciafmt.jsonld as jsonld
 import lciafmt.traci as traci
@@ -34,6 +35,7 @@ class Method(Enum):
     TRACI = "TRACI 2.1"
     RECIPE_2016 = "ReCiPe 2016"
     FEDEFL_INV = "FEDEFL Inventory"
+    CED = "Cumulative Energy Demand"
     ImpactWorld = "ImpactWorld"
     IPCC = "IPCC"
 
@@ -122,6 +124,8 @@ def get_method(method_id, add_factors_for_missing_contexts=True,
         return ipcc.get()
     if method_id == Method.FEDEFL_INV:
         return fedefl_inventory.get(subset)
+    if method_id == Method.CED:
+        return ced.get()
 
 
 def clear_cache():
diff --git a/lciafmt/ced.py b/lciafmt/ced.py
new file mode 100644
index 0000000..a6c531c
--- /dev/null
+++ b/lciafmt/ced.py
@@ -0,0 +1,60 @@
+# ced.py (lciafmt)
+# !/usr/bin/env python3
+# coding=utf-8
+"""
+Generate method for Cumulative Energy Demand (CED)
+"""
+
+import numpy as np
+import pandas as pd
+
+import lciafmt
+from lciafmt.util import store_method
+
+
+def get() -> pd.DataFrame():
+
+    inv_orig = lciafmt.get_method(method_id = 'FEDEFL_INV', subset = ['ced'])
+    inv = inv_orig.copy()
+    inv['Indicator'] = ''
+    inv['Method'] = 'Cumulative Energy Demand'
+
+    conditions = [
+        inv['Flowable'].isin(['Wood, primary forest']),
+        inv['Flowable'].isin(['Biomass', 'Softwood', 'Hardwood', 'Wood']),
+        inv['Flowable'].isin(['Energy, hydro']),
+        inv['Flowable'].str.contains('|'.join(['wind', 'solar', 'geothermal'])),
+        inv['Flowable'].str.contains('Uranium'),
+        inv['Flowable'].str.contains('|'.join(['Coal', 'Oil', 'Crude',
+                                               'gas', 'Methane'])),
+        ]
+
+    indicators = ['Non-renewable, biomass',
+                  'Renewable, biomass',
+                  'Renewable, water',
+                  'Renewable, wind, solar, geothermal',
+                  'Non-renewable, nuclear',
+                  'Non-renewable, fossil',
+                  ]
+    inv['Indicator'] = np.select(conditions, indicators, default='')
+
+    ## Original CED Method included the
+    # "Energy, fossil, unspecified" technosphere flow;
+    # this has been dropped
+    # https://www.lcacommons.gov/lca-collaboration/National_Renewable_Energy_Laboratory/USLCI_Database_Public/dataset/FLOW/46dc4693-2f24-39d2-b69f-dd059737fd5e
+
+    ## Original CED Method used HHV for biomass/wood flows
+    # Some wood flows were removed after the original method in FEDEFLv1.0.8
+
+    # Dropped flows from FEDEFL inv method: "Hydrogen", "Energy, heat"
+    inv = inv.query('Indicator != ""').reset_index(drop=True)
+
+    return inv
+
+
+if __name__ == "__main__":
+    method = lciafmt.Method.CED
+    df = get()
+    store_method(df, method)
+    lciafmt.util.save_json(method, df)
+    # lciafmt.util.save_json(method, df, write_flows=True)
diff --git a/lciafmt/data/description.yaml b/lciafmt/data/description.yaml
index de20bad..225ac34 100644
--- a/lciafmt/data/description.yaml
+++ b/lciafmt/data/description.yaml
@@ -7,6 +7,7 @@ description: >+
     
     Source citation: [citation]
     
+mapping: >+
     [Method] flowable and context input files are maintained in the FEDEFL
     GitHub Repository: https://github.com/USEPA/fedelemflowlist
     
diff --git a/lciafmt/data/lcia.bib b/lciafmt/data/lcia.bib
index 5f96129..f6a3bb0 100644
--- a/lciafmt/data/lcia.bib
+++ b/lciafmt/data/lcia.bib
@@ -45,3 +45,12 @@ @incollection{smith_earths_2021
 	author = {Smith, Chris and Nicholls, Zebedee R. J. and Armour, Kyle and Collins, William and Forster, Piers and Meinshausen, Malte and Palmer, Matthew D. and Watanabe, Masahiro},
 	year = {2021},
 }
+
+@report{frischknecht_implementation_2007,
+	title = {Implementation of life cycle impact assessment methods},
+	url = {https://esu-services.ch/fileadmin/download/publicLCI/03_LCIA-Implementation.pdf},
+	number = {ecoinvent report No. 3},
+	author = {Frischknecht, Rolf and Jungbluth, Niels and Althaus, H. J. and Bauer, C. and Doka, G. and Dones, R. and Hischier, R. and Hellweg, S. and Humbert, S. and Köllner, T.},
+	urldate = {2024-11-13},
+	year = {2007},
+}
diff --git a/lciafmt/data/methods.json b/lciafmt/data/methods.json
index d971d5f..5a51a92 100644
--- a/lciafmt/data/methods.json
+++ b/lciafmt/data/methods.json
@@ -35,7 +35,7 @@
     "name": "FEDEFL Inventory",
     "version": "1.0.0",
     "path": "fedefl",
-    "url": "http://www.github.com/usepa//Federal-LCA-Commons-Elementary-Flow-List",
+    "url": "https://github.com/USEPA/fedelemflowlist/blob/master/fedelemflowlist/subset_list.py",
     "citation": "",
     "source_type": "FEDEFL Python function"
   },
@@ -67,6 +67,17 @@
                 },
     "citation": "Forster and Ramaswamy 2007 (AR4), Myhre and Shindell 2013 (AR5), Forster and Storelvmo 2021 (AR6)",
     "source_type": "csv"
+  },
+  {
+    "id": "CED",
+    "name": "Cumulative Energy Demand",
+    "version": "1.0",
+    "detail_note": "All heating values are per the FEDEFL, and the list of external references is found on the EPA FEDEFL GitHub at: https://github.com/USEPA/fedelemflowlist. This CED method is based on the categorization scheme used in Frischknecht et al. (2007) found in the ecoinvent report 'Implementation of Life Cycle Impact Assessment Methods.'",
+    "path": "fedefl",
+    "bib_id": "frischknecht_implementation_2007",
+    "url": "https://github.com/USEPA/fedelemflowlist/blob/master/fedelemflowlist/subset_list.py",
+    "citation": "Frischknecht et al. 2007",
+    "source_type": ""
   }
 
 ]
diff --git a/lciafmt/fedefl_inventory.py b/lciafmt/fedefl_inventory.py
index 4b243c4..e72cd92 100644
--- a/lciafmt/fedefl_inventory.py
+++ b/lciafmt/fedefl_inventory.py
@@ -39,7 +39,7 @@ def get(subset=None) -> pd.DataFrame:
                    axis=1, inplace=True)
         flows['Indicator'] = inventory
         flows['Indicator unit'] = subsets.get_inventory_unit(inventory)
-        flows['Characterization Factor'] = 1
+        flows['Characterization Factor'] = 1.0
 
         # Apply unit conversions where flow unit differs from indicator unit
         flows_w_conversion = pd.merge(flows, alt_units, how='left',
@@ -56,3 +56,6 @@ def get(subset=None) -> pd.DataFrame:
 
     method['Method'] = 'FEDEFL Inventory'
     return method
+
+if __name__ == "__main__":
+    df = get()
diff --git a/lciafmt/util.py b/lciafmt/util.py
index 6ef28e1..ffa47e7 100644
--- a/lciafmt/util.py
+++ b/lciafmt/util.py
@@ -187,6 +187,8 @@ def generate_method_description(name: str,
     else:
         method_meta = method.get_metadata()
         desc += generic['description']
+    if 'mapping' in method_meta:
+        desc += generic['mapping']
     if 'detail_note' in method_meta:
         desc += method_meta['detail_note']
     if 'methods' in method_meta: