what are environmental impacts of hydropower?
<answer> Hydropower is emission-free, renewable energy which does not cause any emissions into the air, water, or soil. The construction of hydropower plants changes waterways and their natural conditions. <context> Environmental impacts. Hydropower is emission-free, renewable energy which does not cause any emissions into the air, water, or soil. The construction of hydropower plants changes waterways and their natural conditions.The main environmental impact during production is caused by the regulation of the waterways.Fortum actively moderates this environmental impact.ortum moderates the environmental impact in many ways. Fortum actively moderates the environmental impact of hydropower production in areas affected by the power economy. The impact on the fishing industry is reduced by stocking fish and restoring habitats.