diff --git a/monitoring/db/README.md b/monitoring/db/README.md
index d3978f7..f22836a 100644
--- a/monitoring/db/README.md
+++ b/monitoring/db/README.md
@@ -16,6 +16,9 @@ Requirements:
 
  ```bash
  ssh monitoring
+
+ ./get_detailed_power.py --help
+
  ./get_detailed_power.py 2335001 7678069.hawk-pbs5
  Created file detailed_power.2335001.hawk-pbs5.100000-1000004.csv
  Created file detailed_power.7678069.hawk-pbs5.2432345-423423.csv
diff --git a/monitoring/db/scripts/get_detailed_power.py b/monitoring/db/scripts/get_detailed_power.py
index 60b8232..12387d6 100644
--- a/monitoring/db/scripts/get_detailed_power.py
+++ b/monitoring/db/scripts/get_detailed_power.py
@@ -4,16 +4,18 @@ from collections import OrderedDict
 import os.path
 
 
-def parse_arguments():
+def parse_arguments(args):
 	parser = argparse.ArgumentParser(
 				description='Produce detailed power usage data for a list of jobids.')
 	parser.add_argument('-v', '--verbose', action='store_true',
 				help='Show database querries, etc.')
+	parser.add_argument('-t', '--interval', action='store', type=float, default=5.0,
+				help="Interval between power values in seconds")
 	parser.add_argument('jobid', type=parse_jobid,
 			nargs='+', 
 			help='Job ID such as "2260215" or "2260215.hawk-pbs5"')
     
-	return parser.parse_args()
+	return parser.parse_args(args)
 
 def parse_jobid(s):
 	import re
@@ -25,11 +27,12 @@ def parse_jobid(s):
 
 
 class Power:
-	def __init__(self, nodes):
+	def __init__(self, nodes, interval=-1):
 		self.nodes = nodes
 		self.epochs = OrderedDict()
 		self.first_ts = None
 		self.last_ts = None
+		self.interval = interval
 
 	@classmethod
 	def from_list(cls, data):
@@ -59,7 +62,10 @@ class Power:
 		if not all_list:
 			raise RuntimeError
 
-		return Power.from_list(all_list)
+		power = cls.from_list(all_list)
+		power.set_interval(interval*1000)    # milliseconds
+
+		return power 
  
 	def to_file(self, jobid):
 		"""Dumps power data to file. Returns filename is succesfull and None if unsucessfull."""
@@ -73,11 +79,14 @@ class Power:
 				f.write(self.header())
 				f.write(self.body())
 		except IOError:
-			print("Error: could not write to file ", filename)
+			print("Error: could not write to file ", fname)
 			fname = None
 
 		return fname
 	
+	def set_interval(self, interval):
+		self.interval = interval
+	
 	def insert_epoch(self, ts, values):
 		self.epochs[ts] = values
 		if not self.first_ts:
@@ -95,12 +104,11 @@ class Power:
 	def body(self):
 		_body = ""
 		for epoch in self.epochs.items():
-			_body += Power.pretty_print(self.summarize_epoch(epoch))
+			_body += self.pretty_print(self.summarize_epoch(epoch))
 		return _body
 	
-	@staticmethod
-	def summarize_time(ts):
-		return ts, -1
+	def summarize_time(self, ts):
+		return ts, self.interval
 
 	@staticmethod
 	def summarize_values(val):
@@ -111,11 +119,10 @@ class Power:
 		median = np.median(values)
 		return head, avg, median, min, max, stddev
 
-	@staticmethod
-	def summarize_epoch(epoch):
+	def summarize_epoch(self, epoch):
 		ts, values = epoch
-		return Power.summarize_time(ts) \
-				+ Power.summarize_values(values)
+		return self.summarize_time(ts) \
+				+ self.summarize_values(values)
 				# + values
 	
 	@staticmethod
@@ -204,8 +211,8 @@ class App:
 
 
 if __name__ == "__main__":
-	config = parse_arguments()
-	config.interval = 5
+	import sys
+	config = parse_arguments(sys.argv[1:])
 
 	main = App(config)
 	main.run_all()