Energy Storage Block
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Energy storage blocks are a block form of a battery, capable of receiving energy and storing it for later use. Types of energy storage block are detailed in the table below. Most are also far more cost-effective than item batteries, being more expensive but having a far higher energy capacity. Most battery types have this block form, the exception being redstone and trixite. The FEnSU is an energy storage block that has no battery counterpart.
Compare with capacitors, which also store energy, but also act as diodes, and generally provide more energy storage at a lower cost, but do not provide a GUI or slots to charge/discharge items.
Energy storage block capacities, max input rates and max output rates are linked in the following ratio: 1000:5:1.67
The only exception to this is the FEnSU.
| Capacity | Max input | Max output | |
|---|---|---|---|
| Potato | 10kHE | 50HE/t | 16HE/t |
| Standard | 1MHE | 5kHE/t | 1.67kHE/t |
| Li-Ion | 50MHE | 250kHE/t | 83.33kHE/t |
| Schrabidium | 25GHE | 125MHE/t | 41.67MHE/t |
| Spark | 1THE | 5GHE/t | 1.67GHE/t |
| FEnSU | 9.22EHE | 10PHE/t | 10PHE/t |
Usage
Energy storage blocks store varying amounts of power and can charge batteries, machines, and tools such as the impact drill.
A storage block works by charging it with either a battery or by connecting it (with a red copper cable) to a power source such as a wood-burning generator.
A storage block's transfer mode (input, output, buffer, none) can be used to control power flow, and set to change based on an incoming redstone signal. There is also the option of changing the storage block energy priority, those options being:
- Low priority (default) - the block will consume charge after machines have filled
- Medium priority - the block will charge with the same priority as machines
- High priority - the block will take most available charge, only allowing machines to fill after it has filled itself.
Potato Battery Block

The potato battery block is the easiest type of energy storage block to craft. The crafting recipe is:
The total capacity for this block is 10 kHE (10,000 HE), which makes this energy storage block one hundred times smaller than its successor, the energy storage block. It sports a wooden structure with a picture of a potato on the top. This block can be useful for powering machinery that uses very little power, like the shredder, or an oil refinery.
Energy Storage Block

The "default" and generic energy storage block (lead-acid battery) is the second tier of the energy storage blocks. It can hold a total of 1 MHE (1,000,000 HE), making it one hundred times larger than its predecessor. It is more expensive to make than the potato battery block, as the following materials are required:
The block sports a white and orange texture. Energy storage blocks are good for many applications, such as assembly machines, electric furnaces, electric presses, missile launch pads, and many other machines that draw medium amounts of power. Energy storage blocks can also be found in abandoned factories, crashed spaceships, and other naturally generated structures.
Li-Ion Energy Storage Block

The lithium-ion energy storage block carries 50 times the amount than the default energy storage block, with a total energy capacity of 50 MHE (50,000,000 HE). The block can be assembled using:
The block's appearance is gray and white, with all of the same markings the energy storage block has. This block is great for powering multiple machines at once and for storing larger amounts of energy from machines like geothermal electric generators.
Schrabidium Energy Storage Block

The schrabidium energy storage block is the fourth tier energy storage block. It can hold an impressive 25 GHE (25,000,000,000 HE), being five hundred times larger than its predecessor. It proves to be a more advanced build as it is assembled using:
The appearance of this block is a blue and orange theme of the default energy storage block. These energy blocks are very useful for storing large amounts of HE from machines like nuclear reactors, turbofans, and the watz power plant.
Spark Energy Storage Block

The spark energy storage block is the fifth and final tier for standard energy storage blocks. It can carry a whopping 1 THE (1,000,000,000,000 HE), making it 40 times larger than the schrabidium energy storage block. With it being exceptional in energy storage, it is extremely pricey. It is crafted using:
Its appearance sports a purple tint with the letter 'E' on the side and the spark symbol on the top. It is useful for storing HE from machines that produce extreme amounts of HE like the fusion reactor and ICF.
Ferriswheel Electronium Storage Unit (FEnSU)

The FEnSU is the ultimate and final tier of the storage units, being the only multiblock storage unit of the list. It can store the pseudo-infinite amount of 9.22 EHE (9,220,000,000,000,000,000 HE), making it superior to the spark one by 9,220,000 times. It's useful for storing HE from everything, even the DFC.
Its crafting recipe is simply absurd, the following recipe assembles the FEnSU:
It takes 6 and a half days for a DFC with 1 emitter, max output possible, in order to fill the FEnSU completely.
Trivia
- The FEnSU's max power is actually the maximum signed long (64-bit integer) value in Java, which is , so its max power is 9,223,372,036,854,775,807 to be precise.
- This is also the largest number possible in Java (and in a lot of other languages) for a primitive. While BigInteger is theoretically capable of storing absolutely gargantuan numbers in this context far larger than a long, there is really no need and it likely wouldn't be compatible with the energy system.
- The most powerful reactor, the DFC, needs 6 and a half days in order to fill the FEnSU completely, taking into account that only 1 emitter is used, but with the best setup possible being: the DFC having a thingy and BF and Antischrabidium fuels, max power output for all machines.
- The spark storage unit is excessively expensive compared to its 3 predecessors, not following the others' pattern either, surely for it being a lot more powerful than the rest, although it is nothing compared to the FEnSU.