Propane is also used as a feedstock for the petrochemical industry and is used for space heating and cooking in the residential and commercial sectors. [...] The relationships across all these energy commodities are complex and intricate, and the outlook for increasing availability of NGLs in Canada points to the existence of various opportunities to expand domestic industries and to diversify and reach new markets. [...] However, the largest constraint is the ability to market natural gas in the same or growing volumes as the Canadian market is set for a decline in natural gas production because of diminishing US requirements for imports. [...] The analysis will focus on the changing dynamics of the midstream industry in Western Canada and the proposed midstream and downstream investments being incurred to monetize increasingly available NGL volumes in Canada. [...] The growth of the use of NGLs in the petrochemical industry and significant advances in the development of shale gas resources have promoted NGL production across the world.