Can small hydropower stations be built first and then connected to the grid? Is that dangerous?
Of course. However, this is economically dangerous. If the grid is not approved to be connected to the grid, it will be in vain. Similarly, if it is to be connected to the grid, the power grid has requirements for the metering system and communication system of hydropower stations. If you buy equipment that does not meet the requirements of the power grid company in advance, you will waste money and have to buy equipment that meets the requirements again.