This is the largest subclass of the structures type. Energy structures are the main source of energy in the game. All races have at least several of these.

Note : the stats as they are listed in the table below are taken from HD Xyth. In older versions of the game, some cards might have different stats.

Card	Race	2nd Race	Rarity	Energy cost
Ancient Convertor	AR		common	0
Antifusor	CA		common	0
Antigrav Vault	RV	CA	common	0
Antimatter Plant	CA		common	0
Antimatter Storage	CA		common	0
Antisolar Plant	HU	CA	common	0
Chaos Mind	TM	MT	common	0
Crystal Antistar	HU		elite	0
Crystal Furnace	CC	XY	common	0
Crystal Monolith	XY	MT	common	0
Crystal Plant	HU	XY	common	0
Crystalline Fusor	CA	XY	common	0
Dark Crystalline Fusor	XY		elite	0
Dark Energy Tower	CA		common	1
Dark Fusor	CC	CA	common	0
Dark Obelisk	CA		elite	1
Dark Rift	RD	CA	common	0
Dark Spire	CA	CC	common	0
Decay Fusor	CC		common	0
Dimensional Rift	RD	TM	common	0
Dimensional Wave Hub	TM	RV	common	0
Elemental Rift	RD		elite	1
Elemental Techno Crystal	TM		elite	0
Energy Rift	RD		common	2
Entropic Link	MT		common	1
Entropic Monolith	MT		common	0
Entropic Rift	RD	MT	common	0
Entropy Node	MT		common	1
Flare Spire	HU		common	1
Flux Fusiongate	TM	CC	common	0
Fused Gravimorph	CC		elite	0
Fused Star Rift	RD		elite	0
Fusion Furnace	CC		elite	1
Fusion Monolith	MT	CC	common	0
Fusion Plant	CC		common	0
Fusion Rift	RD	CC	common	0
Fusion Spire	CC		common	0
Grand Technolith	TM		elite	1
Grav Crystal	XY	RV	common	0
Grav Current Buoy	RV		common	0
Grav Flux Amplifier	RV		common	1
Grav Fusion Buoy	RV	CC	common	0
Grav Wave Farm	RV		common	0
Grav Wave Hub	RV		common	0
Gravitational Rift	RD	RV	common	0
Hivemind Fusor	CC		common	1
Inversion Monolith	CA	MT	common	0
Lesser Rift	RD		common	0
Massive Antigate	CA		elite	0
Mind Morpholith	MT		common	0
Morpholith	MT		common	0
Nebula Harvester	XY		common	0
Nebula Shard	XY		common	0
Nebular Guard Tower	XY		elite	1
Nebular Rift	RD	XY	common	0
Obscure Megalith	MT		elite	1
Power Plant	HU		common	0
Prismatic Spire	XY		common	0
Recall Gate	TM		common	0
Reliquary	AR		common	1
Rift Echogate	TM	RD	common	0
Rift Monolith	MT	RD	common	0
Rift Tracer	RV	RD	common	0
Salvage Yard	RV		common	1
Science Lab	AR		common	0
Shard Tree	XY		common	1
Shield Bastion	RV		elite	1
Slave Spire	CC	MT	common	0
Solar Buoy	HU	RV	common	0
Solar Citadel	HU		elite	1
Solar Gate	HU	TM	common	0
Solar Harvester	HU		common	0
Solar Monolith	MT	HU	common	0
Solar Plant	HU		common	0
Solar Rift	RD	HU	common	0
Solar Technolith	MT		elite	0
Solar Tree	XY	HU	common	0
Solarfusor	CA	HU	common	0
Spectralis Core	AR		elite	3
Sun Spire	HU	CC	common	0
Technogate	TM		common	0
Technomind	CC	TM	common	1 1
Technospire	TM		common	0
Towering Crystal	XY		common	0
Unstable Grav Rift	RV		elite	0
Virus Spire	TM		common	1
Wave Convertor	RV	XY	common	0
Wave Morpholith	MT	RV	common	0