There are various observational results which suggest that certain solar bursts have spectral components extending into the submm‐w and infrared range. This is essentially unexplored for burst emissions in the continuum. The short time scales of burst structures (tens of milliseconds) correlated to hard X‐rays bring serious constraints for interpretation. One possibility is to assume the impulsive phase made of explosions of compact synchrotron sources and self inverse‐Compton reducing the electrons energy, producing the correlated spiky hard X‐ray component. A new project for a solar submm‐w telescope is now being developed in a collaboration between groups in Brazil, Switzerland and Argentina. It is expected to bring important observational clues for the understanding of the initial phase of flares. ©1996 American Institute of Physics.