This seems entirely possible in a hypothetical case. Energy source A costs $1 per unit and is sold at $1 per unit. Energy source B costs $6 per unit and is so

This seems entirely possible in a hypothetical case. Energy source A costs $1 per unit and is sold at $1 per unit. Energy source B costs $6 per unit and is sold at $2 per unit. So long as A exists, B will be overpriced, even with that subsidy.