Yeah private capital is great at cookie-cutter projects, like buying factory-made pre-built windturbines or solar panels and operating them, this a low-risk operation and every bean-counter can model it's profitability in excell. But when it comes to developing new types of solar panels and suddenly without government research dollars there is zilch.

It is also nowhere to be seen when we need actually risky and difficult projects like build a massive hydroelectric damn or multi-gigawatt power storage which will be required to support these renewables. It is nowhere to be seen in Tidal and Geothermal, which you can't buy premade from a factory in China. It is also useless in keeping reserves of grain, gas, or any other critical resource.

So why should anyone take seriouslty this point about private capital if it only contributes in areas of least concern?

If the human race was sitting around for private capital, we'd have gone extinc by now.