I doubt that politics is the reason why extremely small installations like that are uneconomical. The capex per kWh would be higher and the same for the opex, m

I doubt that politics is the reason why extremely small installations like that are uneconomical. The capex per kWh would be higher and the same for the opex, maybe you can properly reduce the capex if you produce tons of them but how will you fix the opex? You'll need too many people per kWh to operate the plant and for security.