On April 16, 2026, the French consumer advocacy group CLCV announced it had filed a legal action against Électricité de Strasbourg (ÉS) over its “Biogaz 100% alsacien” energy offer, alleging that the product is marketed in a way that misleads consumers about its true origin and environmental benefits.
The CLCV, a nationally accredited consumer protection association based in Montrouge, argues that whereas the offer is presented as delivering gas produced exclusively in Alsace, the physical gas delivered to customers’ homes is identical to the standard network gas available to all consumers. Instead, the premium paid by subscribers funds the purchase of “guarantees of origin” — certificates that certify renewable gas production but do not ensure the gas consumed locally comes from the advertised source.
According to the CLCV, the terms of the offer include a clause allowing the guarantees of origin to be sourced not only from a methanization unit near Strasbourg but, if supplies are insufficient, from other producers across Alsace and, as a last resort, from anywhere in France — without any reduction in price or automatic compensation to consumers when the gas is no longer exclusively Alsatian in origin.
François Carlier, director of the CLCV, stated that the marketing of the offer leads consumers to believe they are receiving a distinct, locally produced biogas at their domicile, when in reality they receive the same gas as other customers. He emphasized that the term “100% alsacien” implies an exclusive and integral origin in Alsace, which the contractual terms do not guarantee.
The legal action was filed before the judicial tribunal of Nanterre, with the CLCV seeking to represent consumers who may have suffered economic harm due to the alleged misleading presentation. The association has invited affected customers to contact them via email at [email protected] to provide testimony for the case.
The CLCV’s contention centers on transparency in green energy marketing, particularly as demand for renewable energy options grows among environmentally conscious households. The case highlights broader concerns about the use of origin guarantees in energy contracts and whether such mechanisms adequately inform consumers about the actual source and impact of their energy choices.
As of the announcement, Électricité de Strasbourg had not publicly responded to the allegations. The organization continues to offer the “Biogaz 100% alsacien” option on its website, describing it as a way to support local renewable production, reduce carbon footprint and contribute to the development of green energies in France.
The outcome of the case could influence how energy suppliers across France present renewable energy offers, particularly those relying on certificate-based models rather than physical segregation of green gas in distribution networks.
Consumers seeking updates on the proceedings are advised to monitor the judicial tribunal of Nanterre’s docket or consult official communications from the CLCV regarding the case.
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