In the next years, France will renew a consistent share of hydroelectric concessions, among which we find those insisting on the Aspe and its tributaries (for a total of almost 100 MW). Beauty contests will take place, where bidders will present offers for technical and environmental improvements, as well as a revenue sharing percentage for Local Authorities. This framework generates a potential trade-off between revenue-sharing and environmental improvement. Our work investigates this trade-off by means of a discrete choice experiment (DCE) to estimate people's preferences. The experiment has been conducted on a representative sample living in the Aspe valley. In our DCE, we translate the revenue sharing in an immediate rebate in the electricity bill. Respondents could choose higher rebates and lower ecosystem improvements or lower (or no) rebate and higher ecosystem amelioration. According to the experiment results, the highest total willingness to pay (WTP) is above € 144 per household and per year. Moreover, people's marginal WTP for a satisfactory fish stock reaches 250 €/year, that is three times the maximum rebate that was offered. Finally, all environmental attributes are considered as significant and worth a monetary effort. Therefore, hydroelectric concession bidders should give clear priority to environmental aspects.
