{"id":2832,"date":"2026-08-20T07:24:45","date_gmt":"2026-08-20T06:24:45","guid":{"rendered":"https:\/\/www.farmersforum.ie\/trends\/a-hydroelectric-plant-changed-the-fate-of-the-berre-lagoon-and-its-effects-remain\/"},"modified":"2026-08-20T07:24:46","modified_gmt":"2026-08-20T06:24:46","slug":"a-hydroelectric-plant-changed-the-fate-of-the-berre-lagoon-and-its-effects-remain","status":"publish","type":"post","link":"https:\/\/www.farmersforum.ie\/trends\/a-hydroelectric-plant-changed-the-fate-of-the-berre-lagoon-and-its-effects-remain\/","title":{"rendered":"A Hydroelectric Plant Changed the Fate of the Berre Lagoon, and Its Effects Remain"},"content":{"rendered":"

A diverted river, a transformed lagoon, and sixty years of ecological consequences: behind the tranquil waters of the \u00c9tang de Berre lies a full-scale experiment. How could a hydroelectric facility built in 1966 permanently alter an entire Mediterranean ecosystem?<\/strong><\/p>\n

<\/figure>\n

In 1966, the Durance\u2019s waters abruptly take a path the natural world had never foreseen<\/h2>\n

At first glance, the \u00c9tang de Berre resembles a vast Provencal inland sea. Yet its functioning changes radically in 1966. That year, the Saint-Chamas hydroelectric plant comes online. From then on, the EDF canal begins to return water from the Durance, after a long journey through several installations.<\/p>\n

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Very quickly, the change becomes evident. Indeed, the saline lagoon now receives hundreds of millions of cubic meters of fresh water coming from a basin that did not feed it naturally. Today, the discharges can still reach 1.2 billion cubic meters per year, while also carrying silt from the Durance.<\/p>\n

It took fishermen and Europe to impose limits on the plant\u2019s discharges<\/h2>\n

From the banks, the upheaval remains subtle. Yet beneath the surface, the dynamics change profoundly. The fresh water, less dense, stays at the surface, while the salt water, heavier, sinks downward. Thus, a stratification of the water column<\/strong> sets in and severely limits vertical exchanges.<\/p>\n

When this separation persists, the consequences grow heavy. Gradually, the sea bottom suffocates as oxygen no longer circulates properly. As a result, episodes of anoxia appear. In 2018, a major crisis affected more than 90% of the ecosystem<\/strong>, causing high mortality among shellfish, invertebrates, and a retreat of the seagrasses.<\/p>\n

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However, this imbalance does not depend solely on the volumes of water. In fact, temperature, wind, nutrient inputs, and salinity interact continuously. Thus, the \u00e9tang can remain stable for months, then suddenly tilt when several factors combine.<\/p>\n

Six decades later, the \u00e9tang is gradually recovering but the dilemma remains<\/h2>\n

For decades, the degradation fueled the anger of fishermen and conservationists around the \u00e9tang. Gradually, the conflict widened in scope. Ultimately, on October 7, 2004, the Court of Justice condemned France for failing to take adequate measures against the pollution linked to discharges into the \u00c9tang de Berre.<\/p>\n

Subsequently, management evolved gradually. From 2006 onward, discharges were capped at 1.2 billion cubic meters per year<\/strong>, whereas they had been higher before. At the same time, seasonal adjustments were introduced to reduce inputs during the most sensitive periods for the ecosystem.<\/p>\n

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More recently, in March 2026, a new turning point emerged. The Administrative Court of Marseille recognizes an ecological prejudice<\/strong> linked to the discharges. From then on, the State and EDF see their responsibilities engaged and must revise the operation of the system.<\/p>\n

Sixty years later, a still fragile balance between energy and nature<\/h2>\n

The story is not limited to ecological collapse. On the contrary, several indicators show a gradual improvement. Some species are returning, while the episodes of crisis diminish. Yet this ecological recovery<\/strong> remains fragile, as the 2018 crisis demonstrated the speed with which a tipping point can be reached.<\/p>\n

Meanwhile, the Durance-Verdon chain remains a major energy pillar. It comprises 23 power plants and 16 dams<\/strong>, while producing a significant share of regional electricity. It also plays a crucial role in irrigation and water management in Provence-Alpes-C C\u00f4te d\u2019Azur.<\/p>\n

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Thus, the paradox remains. Further reducing discharges would benefit the ecosystem, but at the cost of weakening a vital infrastructure. The current experimentation must therefore navigate between these two logics. How far can a system be adjusted without throwing another out of balance? Sixty years after 1966, the answer remains open.<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":2833,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2175,2173,2177,2174,2172,2176,424,2178],"class_list":["post-2832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-berre","tag-changed","tag-effects","tag-fate","tag-hydroelectric","tag-lagoon","tag-plant","tag-remain","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"_links":{"self":[{"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/posts\/2832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/comments?post=2832"}],"version-history":[{"count":1,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/posts\/2832\/revisions"}],"predecessor-version":[{"id":2834,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/posts\/2832\/revisions\/2834"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/media\/2833"}],"wp:attachment":[{"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/media?parent=2832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/categories?post=2832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.farmersforum.ie\/trends\/wp-json\/wp\/v2\/tags?post=2832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}