Where do you live that you pay $0.03/kWh?
The cost of solar in the US is highly dependent on labor costs and the regulatory process. So OPs system would cost less in Kazakhstan based on lower labor costs.
Residential solar is also an expensive way to produce solar. In the US we have industrial scale plants that produce at $0.018-0.024/kWh.
https://www.iea.org/reports/kazakhstan-energy-profile
Coal fuels around 70% of electricity generation (in 2018), followed by natural gas (20% in 2018).
(rest seems to be hydro)
I assume cheap because no carbon tax.