DOCTOR: Right. What's the signal? Where's it coming from?
TASHA: It's a settlement. Human colony, level two. A farm, basically.
Medan jag inte tror någonting i avsnittet själv föreslog något om vilken typ av kraftproduktion som används, är några av de snabba novellerna som nämns i Trenzalore TARDIS wikiartikel , både från boken Tales of Trenzalore , säg att de ursprungliga kolonisterna hade tappat underjordiska heta källor, så det kan tyder på att kolonierna kör på geotermisk kraft:
Approximately 150 years before the Eleventh Doctor began his residency on Trenzalore, humans colonists settled on the planet. Some of the first colonists were Jalen Fellwood and Roland Treece, both of whom became headsmen at a time when the Truth Field did not yet exist. (PROSE: The Dreaming) The early settlements stockpiled boronite, which they used to reach underground hot springs by exploding the bedrock that covered them. The leftover boronite was eventually shelved. (PROSE: Strangers in the Outland)