What type of efficiency are you talking about?  For kWh&#x2F;$ efficiency, non-concentrated flat-panel solar is the most efficient.<p>Concentrated solar power in practice is usually thermally based, heating up something and then generating electricity from that. It&#x27;s more expensive, but also is a form of storage, so depending on the use case it may be cheaper over all, but that&#x27;s highly dependent on the situation.