Commissioned by Électricité de France, the Rance station exploits a tidal range in the Rance estuary of up to about 8 meters, among the largest in the world, using 24 bulb turbines that can generate power on both the incoming and outgoing tide. It remains in operation today, 60 years after opening, and is often cited as a benchmark for the long operating lifespan achievable by tidal infrastructure.
The question, scope, and sources behind this Registry record.
Commissioned by Électricité de France, the Rance station exploits a tidal range in the Rance estuary of up to about 8 meters, among the largest in the world, using 24 bulb turbines that can generate power on both the incoming and outgoing tide. It remains in operation today, 60 years after opening, and is often cited as a benchmark for the long operating lifespan achievable by tidal infrastructure.
The Rance Tidal Power Station on the Rance estuary in Brittany, France, began commercial operation in 1966 with a capacity of 240 MW, becoming the world's first tidal power station and, for 45 years, the largest by capacity until South Korea's Sihwa station surpassed it in 2011.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
No community challenges are recorded for this published version yet.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-RANCE-TIDAL-FIRST
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-RANCE-TIDAL-FIRST. Rance Tidal Power Station — world's first tidal power station. 2026.