"Long term" means decades when it comes to energy strategy, major infrastructure initiatives, and decarbonization. Four years is woefully inadequate for strategic planning, you’re operating on a tactical level at best.
There is no reason to do long term projects with public funds. Private companies are not subject to the vagaries of democracy and can plan as long-term as they want.
Except funding is not everything that's needed for long term projects. There are other resources - workforce, supply chain integrity, legal entitlements and approvals, etc, that are all contributing to "plannable delivery" of long-term projects. And quite a few of these are very much subject to the vagaries of democracy.
Unless, of course, you assume (the ideal to be) an entirely anarchist business environment where whoever-with-resources can do whatever. Democracy, though, is not that.