A dynamic factor model for the cross section for italian electricity forward prices is presented. This market is characterised by a small number of quotations for each forward contract and by a large bid-ask spread. Moreover, it is not uncommon to observe inconsistencies in the cross section of forward quoted prices. The aim of the proposed model is twofold. Firstly, this approach allows to filter out noise and to help in identifying inconsistencies. Secondly, it provide a tool to fill-in missing quotations and to unpack forward contract with long delivery into smaller ones (i.e. a quarter or a calendar into its monthly components). The model is built using monthly contracts are used as basic entities and their dynamics is modeled as follows. The cross section of those contracts is decomposed in two set of factors: the first set, which depends on the time-to-delivery, allows to financial structure of the market. The second set, which depends on the actual delivery month, will capture the seasonal component. The parameters of those factors are allowed to be slowly varying to achieve maximal flexibility.