If that were really true, they wouldn't need heavy and continuous subsidy by government to make them work in the marketplace. People would buy them, and companies would adopt them because they were cost effective on their own.
The PC market initially was rather niche and slow in growth due to manufacturers keeping their designs proprietary. What opened the PC market to its huge and revolutionary growth was IBM introducing a model that was mass produced, and had open architecture for software development. That allowed widespread use of a common set of hardware, and software developers were free to create masses of new programs and applications easily. NONE OF THAT REQUIRED GOVERNMENT INTROVENTION OR SUBSIDY.
If solar and wind worked, the government wouldn't have to foot the bill for upwards of 50% of the cost of developing in installing it. Same goes for battery cars. These were tried back in the 1910's, and many times since. Every time, they failed in the marketplace against gasoline powered ICE vehicles. This time, they are ONLY succeeding because the government is subsidizing them and penalizing ICE vehicles. If that weren't the case, they'd have already failed in the marketplace this time too.