Midstream energy companies transport, store and process oil and natural gas through infrastructure assets — pipelines, terminals, processing plants and storage facilities. The critical differentiator from upstream producers is that most midstream revenues are fee-based and volume-driven rather than commodity price-dependent. When a cubic foot of gas travels through a pipeline, the midstream company earns a fee regardless of whether the gas price is $2 or $8. This creates earnings stability that makes midstream the most bond-like segment of the energy sector. Volume throughput is the key metric rather than commodity pricing, though sustained low commodity prices can reduce drilling activity and ultimately reduce the volumes flowing through infrastructure. Long-term contracts with take-or-pay provisions provide additional revenue protection. Leverage levels matter significantly since the asset-heavy model requires substantial financing. For investors, midstream companies offer attractive dividend yields, relative earnings stability within the energy sector and infrastructure-like characteristics that are less correlated to oil price movements than upstream businesses.