Tidal (service) Tidal (service) Tidal (stylized as TIDAL) is a subscription-based music, podcast and video streaming service that combines lossless audio and high-definition music videos with exclusive content and special features on music. The service is maintained by the Norwegian company Aspiro AB. The service has over 60 million tracks and 240,000 music videos. Tidal claims to pay the highest percentage of royalties to music artists and songwriters within the music streaming market, while offering two levels of digital music streaming service: Tidal Premium (lossy quality) and Tidal HiFi (lossless CD quality – FLAC-based 16-Bit/44.1 kHz – and MQA). Tidal was launched
Shrouded tidal turbine Shrouded tidal turbine The shrouded tidal turbine is an emerging tidal stream technology that has a turbine enclosed in a venturi shaped shroud or duct (ventuduct), producing a sub atmosphere of low pressure behind the turbine. The venturi shrouded turbine is not subject to the Betz limit and allows the turbine to operate at higher efficiencies than the turbine alone by increasing the volume of the flow over the turbine. Claimed improvements vary, from 1.15 to 4 times higher power output than the same turbine minus the shroud. The Betz limit of 59.3% conversion efficiency for a turbine in an