diff --git a/gtep/tests/unit/test_validation.py b/gtep/tests/unit/test_validation.py
index f70b4f5..19e01ef 100644
--- a/gtep/tests/unit/test_validation.py
+++ b/gtep/tests/unit/test_validation.py
@@ -6,9 +6,10 @@
 from pyomo.contrib.appsi.solvers.highs import Highs
 import logging
 
-from gtep.validation import populate_generators
+from gtep.validation import clone_timeseries, filter_pointers, populate_generators, populate_transmission
 
 input_data_source = "./gtep/data/5bus"
+output_data_source = "./gtep/tests/data/5bus_out"
 
 def test_solution():
     data_object = ExpansionPlanningData()
@@ -40,14 +41,14 @@ def test_solution():
 
 class TestValidation(unittest.TestCase):
     def test_populate_generators(self):
-        populate_generators(input_data_source, solution, "")
-        pass
+        populate_generators(input_data_source, solution, output_data_source)
+
 
     def test_populate_transmission(self):
-        pass
+        populate_transmission(input_data_source, solution, output_data_source)
 
     def test_filter_pointers(self):
-        pass
+        filter_pointers(input_data_source, output_data_source)
 
     def test_clone_timeseries(self):
-        pass
\ No newline at end of file
+        clone_timeseries(input_data_source, output_data_source)
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diff --git a/gtep/validation.py b/gtep/validation.py
index 6c54712..96782a7 100644
--- a/gtep/validation.py
+++ b/gtep/validation.py
@@ -2,6 +2,8 @@
 from gtep.gtep_model import ExpansionPlanningModel
 from gtep.gtep_solution import ExpansionPlanningSolution
 import re
+import os
+import shutil
 import logging
 
 import pandas as pd
@@ -40,9 +42,10 @@ def renewable_name_filter(gen_name):
     end_investment_gens += [k for k in end_investment_renewable_gens.keys()]
     # populate output dataframe
     output_df = input_df[input_df['GEN UID'].isin(end_investment_gens)]
-    ## FIXME: (@jkskolf) this only handles thermals and discards renewables
 
     # TODO: (@jkskolf) should we update prices here? I think no, but ...
+    if not os.path.exists(data_output_path):
+        os.makedirs(data_output_path)
     output_df.to_csv(data_output_path + '/gen.csv',index=False)
 
 def populate_transmission(data_input_path, sol_object, data_output_path):
@@ -59,10 +62,34 @@ def branch_name_filter(gen_name):
     end_investment_branches = [re.search(r'\[.*\]', k).group(0)[1:-1] for k in end_investment_solution_dict.keys()]
     output_df = input_df[input_df['UID'].isin(end_investment_branches)]
     
+    if not os.path.exists(data_output_path):
+        os.makedirs(data_output_path)
     output_df.to_csv(data_output_path + '/branch.csv' ,index=False)
 
-def filter_pointers(data_input_path, sol_object, data_output_path):
-    pass
+def filter_pointers(data_input_path, data_output_path):
+    # load initial timeseries pointers
+    input_pointers_df = pd.read_csv(data_input_path + "/timeseries_pointers.csv")
 
-def clone_timeseries(data_input_path, sol_object, data_output_path):
-    pass
\ No newline at end of file
+    # load final generators
+    # NOTE: must be run _after_ populate_generators and with the same data_output_path
+    # to pull resulting generator objects
+    output_generators_df = pd.read_csv(data_output_path + "/gen.csv")
+
+    # keep generators that exist at the final investment stage and remove the rest
+    # keep all non-generator timeseries pointers
+    matching_gen_list = [gen for gen in output_generators_df['GEN UID']]
+    output_df = input_pointers_df[input_pointers_df['Object'].isin(matching_gen_list) | input_pointers_df['Category'] != 'Generator']
+
+    if not os.path.exists(data_output_path):
+        os.makedirs(data_output_path)
+    output_df.to_csv(data_output_path + '/timeseries_pointers.csv')
+
+def clone_timeseries(data_input_path, data_output_path):
+    file_list = os.listdir(data_input_path)
+    file_list.remove('timeseries_pointers.csv')
+    file_list.remove('gen.csv')
+    file_list.remove('branch.csv')
+
+    # @jkskolf, I don't think I like this ...
+    for fname in file_list:
+        shutil.copy(data_input_path + "/" + fname, data_output_path + "/" + fname)
\ No newline at end of file