Gravity Battery
A 
Gravity Battery is a 
building that stores potential energy with an attached mass above the ground. When the mass is released and gravity lowers the mass to the ground, the motion is harnessed as usable 
Power.
This building is self regulating in-game: it will charge itself when there is a surplus of power in the connected system, and will provide power when there is more demand of power than the other power-producing buildings can provide. The functionality of the Gravity Battery can be completely paused at its current state at any time.
Construction
As the Gravity Battery is 4 units tall, the highest point where this building can be placed is at level 29. The travel height of its mass will also work underwater without any additional resistance, as the game currently does not account for buoyancy. Any structures underneath the mass will affect its capacity for stored energy, as it has less travel it can work with before the mass stops above it.
A Gravity Battery stores 4,000 
hph when built on a flat surface where the mass would stop at the same level as the building's foot. 
Solid buildings like 
Levees and 
Platforms can be used to place the Gravity Battery at a higher elevation, and 
Explosives can be used to lower the floor underneath its mass. An additional 2,000 hph is added to the capacity for every 1 unit added to the total travel height of the mass underneath the pulley.
A Gravity Battery is built with the mass at its highest level, meaning that it is fully charged once complete. While it is possible to quickly deploy a source of Power by building a new battery as and when it's needed, the use of a Gravity Battery in a reactive or disposable manner is not efficient, considering the time taken to construct each building, and the resource recovery deficit when demolishing it after the stored energy is depleted.
Power
The maximum storage possible is 62,000 hph at 29 levels of height below the foot of the building, when the battery is built at the highest possible height and the floor underneath the mass is at the lowest level of the map.
The total potential energy of a Gravity Battery is represented in hph (horsepower hours). A fully charged Gravity Battery with a 6,000 hph maximum capacity will provide 6,000 for 1 hour, or 12,000 for 30 minutes, or 3000 for 2 hours, etc.
The power demand capacity can also be calculated in advance by adding up the total power demand of the buildings in the network, and multiplying it by the number of working hours in the day. For example, a network that requires a total of 700 for a 16-hour work schedule would consume 11,200 hph per day if it runs entirely on stored power, and would consume 1,120 hph per day if other means of power can supply 90% of the demand, leaving the remaining 10% to be replenished by stored power. Buildings that operate 24 hours a day may have to be calculated separately before adding up.
Patch Notes
v0.2.8.1-0748a0c "Update 2"
- Building added to main track
| Generation |  Water Wheel  •  Compact Water Wheel  •  Large Water Wheel •  Power Wheel •  Large Power Wheel •  Windmill •  Large Windmill •  Engine • Gravity Battery
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| Shafts |  Straight Power Shaft •  Power Shaft Turn •  Power Shaft T Intersection •  Power Shaft Intersection •  Upward Power Shaft •  Vertical Power Shaft •  Downward Power Shaft
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