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Research shows that they alter rivers and their fish communities drastically. It seems to stand to reason that small dams cause less environmental problems than large ones. But the first study on small hydropower projects in India proves that they cause as severe ecological impacts as big dams, including altering fish communities and changing river flows. Such hydroprojects, which usually generate less than 25 megawatts of power and consist of a wall that obstructs a river's flow, a large pipe that diverts the collected water to a turbine-driven powerhouse to generate electricity and a canal that releases the water back into the river, are touted to be better than large dams because they submerge fewer regions and barely impact river flow. Such projects receive financial subsidies even carbon credits for being ‘greener’.