Damned if they do


    An industry approach to greener hydropower is far from perfect, but it does offer a way forwards.

    The mighty Iguaçu Falls in Brazil are an excellent illustration of the power of water, so what better place for the hydropower industry to promote what it says is a fresh approach to its sustainability?

    There is ample room for scepticism about the effort — known as the Hydropower Sustainability Assessment Protocol (see page 430). It is an industry-led endeavour that requires next to nothing from the industry. It grades hydropower projects, but makes no judgement on what should happen to projects that rank poorly. And it is geared towards assessment of individual dams, independent of broader questions about energy-resource development. So far, so bad. Yet, if deployed properly, it could also be an invaluable tool to inject much-needed science and reason into a planning process that has operated with little of either for much too long.

    Developers and governments have historically assessed dam projects mainly on the basis of cost and power. Engineers simply survey the landscape to identify the easiest places to block channels, set up turbines and run power lines. Sediments, endemic species and the consequences of severing communication between headwaters and estuaries are very much secondary issues. Even people get short shrift, leading indigenous groups to mount the kind of intense protests that last week saw the Peruvian government shelve plans for a massive dam in the Amazon.

    “The hydropower assessment protocol asks all the right questions but fails to provide any answers.”

    This standard approach has caused numerous environmental problems — such as siltation and blockages to migrating fish — in industrialized countries, which exploited their best hydropower resources long ago and are now trying to repair the damage. In some cases, the costs of improvement outweigh the benefits, and old dams are being decommissioned. But, in the developing world, hydropower projects continue to stack up. Countries in Southeast Asia and Latin America, in particular, are pursing hydropower with gusto, hoping to alleviate energy poverty and feed burgeoning economies. By one optimistic industry estimate, cumulative hydropower capacity could nearly double by 2030. Without a more coordinated approach, these countries are doomed to make the same mistakes.

    The new hydropower protocol comes courtesy of the International Hydropower Association, which consulted with environmental and human-rights groups, as well as representatives from finance and government, in an effort to set out some basic principles of sustainable hydropower.

    After three years of work, the result is a way to assess dam projects on a range of criteria — from planning, governance and public engagement to ecology and hydrology. It is voluntary, however, and there are no minimum standards. The protocol asks all the right questions but fails to provide any answers.

    This has driven a wedge into the community of environmental and social activists that work in this arena. Critics argue that the protocol represents little more than a public-relations exercise that will allow bad developers to appear green while pursuing business as normal — often on projects that pre-date current environmental thinking. This may be true, but, unfortunately, in the political and corporate world such 'greenwash' is common. The new effort would at least create a common language with which to raise concerns, evaluate the best available science and negotiate improvements.

    The biggest shortcoming lies in the assessment of individual dams that have already been proposed for specific locations. Much better would be an approach to analyse entire river basins in an effort to identify the most suitable locations, as well as areas where special precautions should be taken. Indeed, it might well be that some rivers should be left to flow freely to preserve ecological integrity.

    The protocol does touch on these issues, raising questions about a dam's role in the broader energy mix and about wider impacts from hydroelectric development. And it could yet offer a foundation to set minimum standards in these and other areas, so that companies would need to build and operate better dams, as well as integrate them into a more comprehensive energy strategy. For all of its faults, the protocol opens another bridge to a better future. Now it's up to governments, banks and companies to make the journey across.

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    Damned if they do. Nature 474, 420 (2011). https://doi.org/10.1038/474420a

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