How much cost a kw/h on average in Nigeria ?
The average household cost is $0.05 per KW/h, while industrial usage costs $0.08 per KW/h. However, as Charles has explained, the cost of electricity is low, but the light is unstable; therefore, if you must run a mining back, you will need a solar, inverter, or generator backup to avoid blackouts.
Mines or mining farms are not illegal in Nigeria, as far as I am aware.
Is there any information about taxes for cryptocurrency mining here?
as a foreigner, if you make a profit from a business in Nigeria, you are subject to taxation based on your annual earnings.