Rising demand for streaming video is driving a significant increase in the amount of data delivered via CSPs’ networks. To handle the peaks in this traffic, CSPs have had to invest in network capacity, increasing costs and energy consumption. This Catalyst will explore how to make more efficient use of the existing network infrastructure. As the most popular videos are consumed by large number of customers, a content delivery network (CDN) - a geographically distributed group of servers – can be used to cache this content close to end-users, rather than retrieving it from distant servers in every case. Similarly, the most efficient way to support simultaneous demand for live video (in which customers are all watching the same content at the same time) could be to employ multicast delivery mechanisms: multicast adaptive bitrate (MABR) technology could reduce traffic by 90% compared to unicast mechanisms, without compromising the quality of the end-user’s experience. This Catalyst will explore how CSPs can open multicast network capacity to providers of live content and spare CDN capacity to providers of non-linear content. The goal would be to enable partnerships between so-called over-the-top content providers and telecom operators that both deliver growth and achieve network and energy efficiency. Bringing content closer to the end-user with open caches (edge caching) and MABR (on-premises caching) can significantly reduce the pressure on peering and backbone/aggregation transport infrastructures in CSPs’ networks. As a result, CSPs can delay and even avoid unnecessary capacity upgrades in their networks. At the same time, the energy consumption of the end-to-end video delivery chain can be kept constant or even reduced if the network equipment is carrying less traffic, despite the growing demand for video content. Sharing open caches and MABR between various content providers can decrease power consumption further. Temporarily or permanently switching off already-deployed equipment (after appropriately re-routing the remaining traffic) can further increase energy efficiency, while reducing the need for maintenance, repair and upgrade operations. There are also performance benefits: when content is cached near the end-user, latency will be reduced, improving the viewing experience.