This journal article presents two hybrid energy system (HES) models. One, termed traditional, produces electricity only and consists of a primary heat generator, a steam turbine generator, a wind farm and a battery storage. The other, termed advanced, includes the components present in the traditional model but also a chemical plant complex to repurpose excess energy for non-electricity services, such as for producing chemical goods. The authors present key dynamical properties and limitations to HES and prescribes solutions for best managing and mitigating the high variability introduced when incorporating renewable energy into the energy mix. They also discuss the unique design considerations of a nuclear HES.