It is possible, however, as Lawrence Miles and Tat Wood theorise in their reference book About Time 5, that the energy discharge is simply a side effect of the principle's operation.
In a 1993 edition of "Dreamwatch", he wrote a piece entitled "Hai! Anxiety", in which the Jon Pertwee era of the series was — unusually for the time — held up to sustained criticism.
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Tat Wood and Lawrence Miles point out the theatrical influence on this story, drawing particular attention to Luigi Pirandello's Six Characters in Search of an Author, and that the point of the story is to lead the audience to think that it's a story about an alien presence infiltrating the TARDIS in order to pull off the twist that the ship is actually conscious.