diff --git a/tools/Makefile.mk b/tools/Makefile.mk
index dfa7366d0..14b4ef87d 100644
--- a/tools/Makefile.mk
+++ b/tools/Makefile.mk
@@ -13,6 +13,7 @@ dist_pkgdata_DATA += tools/gridlabd-editor.png
 dist_pkgdata_DATA += tools/gridlabd-editor.py
 dist_pkgdata_DATA += tools/insights.py
 dist_pkgdata_DATA += tools/install.py
+dist_pkgdata_DATA += tools/isone.py
 dist_pkgdata_DATA += tools/market_data.py
 dist_pkgdata_DATA += tools/mdb_info.py
 dist_pkgdata_DATA += tools/market_model.py
diff --git a/tools/isone.py b/tools/isone.py
new file mode 100644
index 000000000..b4bddbe1e
--- /dev/null
+++ b/tools/isone.py
@@ -0,0 +1,93 @@
+"""ISO New England data access module
+
+Syntax: gridlabd isone DATASET[=SUBSET] [STARTDATE [STOPDATE]]
+
+Currently supported dataset is only `smd`.  Startdate alone can be given as a
+year. Otherwise start and stop days must provided.
+"""
+
+import sys, os
+import datetime
+import pandas
+
+STARTDATE = None
+STOPDATE = None
+CACHEDIR = "/usr/local/opt/gridlabd/current/share/gridlabd/isone/" if not "GLD_ETC" in os.environ else f"{os.environ['GLD_ETC']}/isone"
+DATETIMEFORMAT = "%Y-%m-%d"
+AREA = "ISO NE CA"
+
+E_OK = 0
+E_SYNTAX = 1
+E_INVALID = 2
+E_FAILED = 3
+
+def error(msg,code=None):
+	print(f"ERROR: {msg}",flush=True,file=sys.stderr)
+	if not code is None:
+		exit(code)
+
+def get_year(year=None,area=None):
+	if year == None:
+		year = datetime.datetime.now().year
+	if area == None:
+		area = AREA
+	csvfile = os.path.join(CACHEDIR,f"smd_{year}_{area.replace(' ','_')}.csv")
+	if os.path.exists(csvfile):
+		return pandas.read_csv(csvfile,index_col=[0,1],parse_dates=[0])
+	else:
+		os.makedirs(CACHEDIR,exist_ok=True)
+		try:
+			url = f"https://www.iso-ne.com/static-assets/documents/{year}/02/{year}_smd_hourly.xlsx"
+			data = pandas.read_excel(url,sheet_name=area,index_col=[0,1])
+		except Exception as err:
+			error(f"unable to get data from '{url}' ({err})",E_FAILED)
+		data.to_csv(csvfile,index=True,header=True)
+		return data
+
+def get_data(startdate=None,stopdate=None):
+	if startdate == None:
+		startdate = datetime.datetime(year=datetime.datetime.now().year)
+	else:
+		startdate = datetime.datetime.strptime(startdate,DATETIMEFORMAT)
+	if startdate == None:
+		stopdate = datetime.datetime.now()
+	else:
+		stopdate = datetime.datetime.strptime(stopdate,DATETIMEFORMAT)
+	if startdate > stopdate:
+		error("startdate is after stopdate",E_INVALID)
+	data = []
+	for year in range(startdate.year,stopdate.year+1):
+		data.append(get_year(year))
+	data = pandas.concat(data)
+	return data.loc[pandas.date_range(startdate,stopdate)]
+
+if len(sys.argv) == 1:
+	for line in __doc__.split("\n"):
+		if line.startswith("Syntax: "):
+			print(line,file=sys.stderr)
+			exit(E_SYNTAX)
+elif sys.argv[1] in ["-h","--help","help"]:
+	print(__doc__)
+	exit(E_OK)
+elif not sys.argv[1].startswith("smd"):
+	error(f"'{sys.argv[1]}'' is not a valid dataset",E_INVALID)
+elif "=" in sys.argv[1]:
+		AREA = sys.argv[1].split("=")[1]
+
+if len(sys.argv) == 2:
+	STARTDATE = None
+elif len(sys.argv) == 3:
+	try:
+		STARTDATE = int(sys.argv[2])
+	except:
+		error(f"startdate '{sys.argv[2]}' is not a valid year",E_INVALID)
+elif len(sys.argv) == 4:
+	STARTDATE = sys.argv[2]
+	STOPDATE = sys.argv[3]
+else:
+	error("too many arguments",E_SYNTAX)
+
+if STARTDATE and STOPDATE:
+	print(get_data(STARTDATE,STOPDATE).to_csv(float_format="%.2f"))
+else:
+	print(get_year(STARTDATE).to_csv(float_format="%.2f"))