This paper investigates price transmissions across European energy forward markets at distinct maturities during both normal times and extreme ‡uctuation periods. To this end, we rely on the traditional Granger causality test (in mean) and its multivariate extension in tail distribution developped by Candelon, Joets, and Tokpavi (2012). Considering forward energy prices at 1, 10, 20, and 30 months, it turns out that no signi…cant causality exists between markets at regular times whereas comovements are at play during extreme periods especially in bear markets. More precisely, energy prices comovements appear to be stronger at short horizons than at long horizons, testifying an eventual Samuelson mechanism in the maturity prices curve. Diversi…cation strategies tend to be more e¢ cient as maturity increases.