The major advancement in technology is the progression on more efficient solar modules. Earlier India saw polycrystalline modules which had lesser efficiencies. Later major solar module makers started making mono-PERC technology based solar modules which could offer effiiencies of around 21%. Now the country is slowly moving to TOPCon technology which offers efficiencies higher than mono-PERC. Another advancement had been was in bringing more Wp panels. Now India has panels having a maximum Wp power of upto 680Wp. Higher Wp power means that to generate the same amount of solar power we would need lesser number of panels as a single higher power panel can produce enough power.