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This paper studies the co-movements between the daily returns of forwards on natural gas traded in the NYMEX with maturity of 1, 2 and 3 months. We identify a structural multivariate BEKK model using a recursive assumption whereby shocks to the volatility of the returns are transmitted from the short to the long section of the forward curve. We find strong evidence of spillover effects in the conditional first moments, for which we show that the transmission mechanism operates from the shorter to the longer maturity. In terms of reduced form conditional second moments, the shortest the maturity, the higher the volatility of the return, and the more the returns become independent from the others and follow the dynamics of the underlying commodity. The evidence from the structural second moments indicates that the longer the maturity is, the higher the uncertainty about the returns. We also show that the higher the structural variance of a maturity relative to that of another maturity, the stronger the correlation between the two.

The Co-Movements Along the Forward Curve of Natural Gas Futures: A Structural View