CapabilityManager.INSTANCE.register(IEnergyData.class, new EnergyData(), EnergyData.class);




public class EnergyData implements ICapabilitySerializable<NBTTagCompound>, IEnergyData, Capability.IStorage<IEnergyData>
	{
		private int energy = 0, maxEnergy = 25000;

		public EnergyData()
		{

		}

		@Override
		public int getEnergy()
		{
			return energy;
		}

		@Override
		public void setEnergy(int energy)
		{
			this.energy = MathHelper.clamp_int(energy, 0, getMaxEnergy());
		}

		@Override
		public int getMaxEnergy()
		{
			return maxEnergy;
		}

		@Override
		public void setMaxEnergy(int energy)
		{
			maxEnergy = energy;
		}

		@Override
		public boolean hasCapability(Capability<?> capability, @Nullable EnumFacing facing)
		{
			return capability == ENERGY_CAPABILITY;
		}

		@Override
		public <T> T getCapability(Capability<T> capability, @Nullable EnumFacing facing)
		{
			if (capability == ENERGY_CAPABILITY)
				return (T) this;

			return null;
		}

		@Override
		public NBTTagCompound serializeNBT()
		{
			NBTTagCompound tag = new NBTTagCompound();

			tag.setInteger("energy", getEnergy());
			tag.setInteger("maxEnergy", getMaxEnergy());

			return tag;
		}

		@Override
		public void deserializeNBT(NBTTagCompound tag)
		{
			setEnergy(tag.getInteger("energy"));
			setMaxEnergy(tag.getInteger("maxEnergy"));

			Logger.info(tag);
		}

		@Override
		public NBTBase writeNBT(Capability<IEnergyData> capability, IEnergyData instance, EnumFacing side)
		{
			return serializeNBT();
		}

		@Override
		public void readNBT(Capability<IEnergyData> capability, IEnergyData instance, EnumFacing side, NBTBase nbt)
		{
			deserializeNBT((NBTTagCompound) nbt);
		}
	}