HARMONI is the visible and near infrared integral field spectrograph (IFS) selected as a first-light instrument for the European Extremely Large Telescope (E-ELT). With four spatial scales and a range of spectral resolving powers, astronomers will optimally configure the instrument to overtake a wide range of scientific programs and to address many of the E-ELT science cases. The Centro de Astrobiología del CSIC/INTA (CAB-CSIC) and the Instituto de Astrofísica de Canarias (IAC) form part of the international consortium developing HARMONI, participation that will constitute an unique scientific opportunity for the Spanish astronomical community, allowing the access to the E-ELT as soon as it were operative via the guaranteed time. We describe here the instrument and its capabilities with special attention to the Spanish contribution to HARMONI. At the current stage of the project, HARMONI design is being revised due to significant modifications of the Nasmyth platform affecting the interface with HARMONI.