The coalition has always focused merely on utility-scale power. It's never been involved in renewable fuels or anything of that sort.
Going back to the original question, what you're fundamentally talking about is the whole question of externalization and internalization of cost from an environmental perspective. Given your role as a minister of the environment in the past, you would well know that there are umpteen numbers of things that we, in society, should internalize the costs of in order to make them more expensive so we don't use them or change behaviour or help protect the environment or people's health.