This book opens with a comprehensive review of technologies for the reutilisation of waste cryogenic energy from the liquefied natural gas regasification process at terminals and on marine vessels. The authors discuss the primary renewable energy source in Cuba – biomass. Although sugarcane biomass has the most significant energy potential, some other biomass energy sources are also relevant at the local level and are convenient from an environmental standpoint. Invisibility cloaks of various types have been researched extensively in recent years with one of the first being the electrostatic cloak, so-named because it effectively screens an internal volume from, and offers no disturbance to, an external static electric field. As such, this compilation explores this phenomenon and whether the cloaked object (or the cloak itself) could be detected by various means. The concluding study explores how, in order to reduce the consumption of oil for electricity generation by 20% in Cuba, the country should build a total of 13 wind farms with a capacity of 633 MW.