Any process that activates or increases the frequency, rate or extent of transcription occuring in the mitochondrion.
Synonyms:
exact_synonym:
positive regulation of transcription from mitochondrial promoter; up regulation of mitochondrial transcription; up regulation of transcription from mitochondrial promoter; upregulation of mitochondrial transcription; upregulation of transcription from mitochondrial promoter
narrow_synonym:
activation of mitochondrial transcription; activation of transcription from mitochondrial promoter