The state’s renewable energy policies are laudable but it must reconsider the risks – and price – of damming an over-dammed geography.Green energy is threatening Tamil Nadu’s greenest district – the Nilgiris. This irony brings into focus the paradoxes of Tamil Nadu’s Dravidian growth model: even as it ensures that the state has enviable development indicators, the sustainable energy projects that fuel it heighten the economic and ecological vulnerabilities of some regions.