A number of different power sources are used depending on the application. For many products the selection of a power sources it what will meet needs, no more and no less. This is economical and practical.
E-drives: Electric drives have become a standard for many vehicles. There are typically two types of E-drives. EMGs (electromagnetic generators) which are used to power civilian vehicles and low-level military vehicles, and MHDGs (magnetohydrodynamic generators) used to power larger military vehicles. EMGs generate electricity via electromagnetic pulse using two primary rods and up to six secondary rods. Many manufactures encase these types of E-drives in non-ferrous shells, which serves to shield the engine from outside magnetic forces as well as increase the efficiency of the drives themselves. MHDGs generate electricity by utilizing plasma instead of rotating EM coils as in the EMG. This allows for greater electrical output but requires more space and so its use is limited to larger military vehicles.
Hyper-Flux Power Plant: Based on advancements in nanotechnology, Hyper-Flux power plants utilize thousands of nano-rods to generate power much like the EMG E-drive. While these plants produce enough power to drive civilian vehicles and some military vehicles, their cost has limited its usage in many other applications besides Power Armor where its size plays an important factor.
Electric Battery: Many economical vehicles and small devices still utilize batteries of varying sorts. Most are completely rechargeable though their size and application determine how long they last. In most economical vehicles their battery capacity allows for approximately 180 miles (290 km) with an average speed of around 65 mph (105 kph).
Flux-fiber: Invented back in 2008, Flux-fiber has become a mainstay for many professional applications. This microfiber cloth contains zinc oxide nanowires paired with gold-coated nanowires. As the wearer moves these wires brush against each other and create electricity. Alone it produces enough electricity to power small devices such as PCUs, HUD monocles, and other small consumer electronics. When an amplifier is attached the electric output can be increased to power medium sized electronics. High-grade applications of Flux-fiber currently show it is capable of providing enough power for Hardsuits and EVA suits.
Fusion Cell: Breakthrough technology in 2239 finally made commercial fusion energy a reality. Improvements in nanotechnology and EM technology allowed for smaller self-contained fusion generators to be constructed and implemented into a variety of designs. While the cost of Fusion Cells still excludes it typical civilian use, it played a key factor in allowing corporations too efficiently and cost effectively put more and more vessels into space. Though not able to power larger vessels, fusion cells can provide enough power for small scout and survey vessels. Use among the military is sporadic, while capable of greater energy output than any E-drive; they are volatile when the casing of the cell has been breached. Its primary use amongst the military is hover-tanks and drop tanks, where the vehicle needs to maintain a high level of energy output to maintain flight or to slow its descent.