Industrial and manufacturing plants can cut energy use and CO₂ emissions dramatically through strategic design choices. Key measures include optimizing facility layout, using high-performance building envelopes (insulation, daylighting), upgrading to efficient equipment (LED lighting, high-efficiency motors with VFDs), and integrating process heat recovery and cogeneration. Onsite renewables (solar, wind, biogas) and electrification of heating (e.g. industrial heat pumps) also deliver large savings. Advanced digital controls and energy management systems further trim waste, while forward-looking provisions for carbon capture or low-carbon fuels lock in long-term emission reductions. Each strategy yields measurable benefits (often tens of percent reduction in fuel or power use) and comes with its own costs and challenges. Practical case studies show energy savings ranging from ~10%–60% or more, with carbon cuts of similar order. This article surveys ten distinct plant-design strategies, explains how they work, quantifies typical savings where data exist, and outlines implementation considerations, barriers, and best-practice guidelines.