diff --git a/code/adhoc_tools.py b/code/adhoc_tools.py
index c319483598..84705a0336 100644
--- a/code/adhoc_tools.py
+++ b/code/adhoc_tools.py
@@ -1,4 +1,5 @@
 import argparse
+import csv
 import glob
 import logging
 import os
@@ -257,6 +258,36 @@ def generate_all_suburbs_nbn_tallies():
     utils.write_json_file("results/all-suburbs-nbn-tallies.json", tallies, indent=1)
 
 
+def generate_state_breakdown():
+    """Generate results/breakdown.STATE.csv containing history of connection-types by state"""
+    output = {}
+    all_ctypes = set()
+    for date, state_info in utils.read_json_file("results/breakdown-suburbs.json").items():
+        logging.info("Processing %s", date)
+        output[date] = {}
+        for state, suburb_list in state_info.items():
+            # logging.info("  State: %s", state)
+            state_tally = {}
+            for suburb, connections in suburb_list.items():
+                # logging.info("    State: %s", suburb)
+                for ctype, ccount in connections.items():
+                    state_tally[ctype] = state_tally.get(ctype, 0) + ccount
+                    all_ctypes.add(ctype)
+            output[date][state] = state_tally
+    utils.write_json_file("results/breakdown-state.json", output)
+
+    # write CSV per state
+    for state in data.STATES:
+        rows = [
+            {"date": date} | {ctype: output[date].get(state, {}).get(ctype, 0) for ctype in all_ctypes}
+            for date in output
+        ]
+        with open(f"results/breakdown.{state}.csv", "w", newline="") as f:
+            writer = csv.writer(f)
+            writer.writerow(rows[0].keys())
+            writer.writerows(r.values() for r in rows)
+
+
 if __name__ == "__main__":
     LOGLEVEL = os.environ.get("LOGLEVEL", "INFO").upper()
     logging.basicConfig(level=LOGLEVEL, format="%(asctime)s %(levelname)s %(threadName)s %(message)s")
diff --git a/code/nbn.py b/code/nbn.py
index ddcd403577..14e78332a3 100644
--- a/code/nbn.py
+++ b/code/nbn.py
@@ -1,7 +1,7 @@
+import difflib
 import logging
 import urllib.parse
 
-import difflib
 import diskcache
 import requests
 from requests.adapters import HTTPAdapter
@@ -43,7 +43,7 @@ def get_nbn_loc_id(self, key: str, address: str) -> str:
         suggestions = sorted(
             suggestions,
             key=lambda s: difflib.SequenceMatcher(None, address, s["formattedAddress"]).ratio(),
-            reverse=True
+            reverse=True,
         )
         if suggestions:
             loc_id = result["suggestions"][0]["id"]
diff --git a/code/update_breakdown.py b/code/update_breakdown.py
index ea73738f7b..3d78faa1b2 100755
--- a/code/update_breakdown.py
+++ b/code/update_breakdown.py
@@ -5,7 +5,7 @@
 from datetime import datetime
 
 import utils
-from adhoc_tools import get_tech_and_upgrade_breakdown
+from adhoc_tools import generate_state_breakdown, get_tech_and_upgrade_breakdown
 from tabulate import tabulate
 
 
@@ -40,3 +40,4 @@ def print_breakdowns(breakdowns):
     logging.basicConfig(level=logging.INFO)
     bd = update_breakdown()
     print_breakdowns(bd)
+    generate_state_breakdown()