Subsea tiebacks are much cheaper than dry tree wells, principally due to the fact they do not require a new platform and facilitate the better use of existing infrastructure. Additional production from subsea wells feeding a host platform may 1) extend the potential life of the host facility, 2) generate better host facility economics by spreading host facility’s fixed cost over more barrels of through-put added from the subsea tie-back, and 3) facilitate production that would be otherwise uneconomical to produce stand alone. In addition to cost saving an operator can avoid the cost and environmental impact of constructing a new platform, which in some instances may require upwards of a hundred thousand tons of steel, one of the most energy-consuming and CO2 emitting industrial activities in the world. Discussion topics include: · Role SSTB play in increasing production while also reducing overall development CAPEX · Lower overall carbon footprint of SSTB keeping host platforms full, longer, amortizing fixed costs over a greater volume of production · Technical challenges of ever-longer SSTB, changing chemistries to meet viscosity challenges of long distance, high pressure · Challenges, technical and commercial of PHA when separate ownership of host and ss well, how this varies around the different basins