For energy where a consumer can easily shift from one source to another. In those cases, falling, fossil fuel prices could impact the demand to switch to alternative. But the reality is switching. Costs are not easy unless buyers of energy are doing so from a distributed location, not from for example panels on their house, then it’s really hard to switch and current fossil fuel prices really don’t matter much.
But the other type of demand is to shift current consumption away from burning fossil fuels and coal to alternative energy, for the sake of the planet, for the sake of the people on the planet. This demand is not dependent on oil prices. Where it involves replacing energy coming from existing fossil fuel or coal burning generation facilities, then construction costs create some competitive disadvantage with energy from existing generation facilities, and then subsidies are necessary to make the economics work. But the subsidies have come way down in the last 15 or so years.