diff --git a/monitoring/db/scripts/get_detailed_power.py b/monitoring/db/scripts/get_detailed_power.py
index a3c7ff8..c59f879 100755
--- a/monitoring/db/scripts/get_detailed_power.py
+++ b/monitoring/db/scripts/get_detailed_power.py
@@ -96,6 +96,8 @@ class Power:
 
 		power = cls(nodes)
 		power.epochs = dataframe.groupby('time')
+		times = list(power.epochs.groups.keys())
+		power.first_ts, power.last_ts = times[0], times[-1]
 		power.dataframe = dataframe
 		power.by_node = power.dataframe.groupby('node')
 		power.energy = power.summarize_energy()