Adjacency Bonus

Buildings showing the adjancency bonus between them as power lines.

The Adjacency Bonus is a game mechanic in Supreme Commander which gives discounts and production bonuses to structures positioned next to each other. The nature of the bonus depends on both of the structures, and can be very useful. Mass or energy can saved or produced, leading to a total of 4 possible bonuses.

General

A Diagram Showing All interactions of the Adjacency Bonus

To have and adjacency bonus, there must be two structures placed next to each other; one giving the bonus and one receiving it.

• Any structure which produced a resource is a bonus giver.
• Any structure consuming a resource is a bonus receiver, including other bonus givers (upgrading mass extractors)
• Additionally, Storages are bonus givers to resource producing buildings.
• Doubling the number of adjacent bonus givers next to a structure doubles the adjacency bonus on that structure.

The Bonus amount is dependent on the number of bonus givers which can fit around a bonus receiver. (minimum:4 maximum:16) This means that the larger a bonus receiver the more bonus givers must be next to it to give the same bonus.
Examples:

• A factory surrounded by 16 T1 power generators receives the same discount as a radar surrounded by 4 T1 power generators.
• A mass extractor surrounded by 4 storages receives the same percentage production bonus as a T3 mass fabricator surrounded by 12 mass storages.

Consumption Bonus

A structure which produces a resource gives a discount to all structures next to it which consume that resource. It should be noted that only structures recieve this bonus, not any engineers or engineering stations assisting them.

Mass

The values in this table are given for one mass producing structure next to a 4x4 building; more mass producing structures would increase the discount. The typical discount value is to give you an idea of what you would most commonly see in game, and should not be used for calculations.

Buildings which give mass discount bonuses

Mass Producing Structures	Discount Percentage	Typical Discount value	Comments
T1 Mass Extractor	7.5%	0.3-1	Useful next to T1 Land Factories, if you're not going to eco much.
T2 Mass Extractor	10%	1-2	Useful next to T2 Land Factories.
T3 Mass Extractor	12.5%	2-4	Useful next to T3 Land Factories, Note: Quantum gateways only receive 10%.
T2 Mass Fabricator	1.25%	0.1-0.3	Not Very Useful. Note: If Both T2 T3 Fabricators are turned off bonus doesn't apply.
T3 Mass Fabricator	20%	2-4	Not Very Useful. Note: Quantum gateways only receive 15%.

Energy

The percentage discount value depends on how much of the structure in question is surrounded by power generators - as structures can be of different sizes, different numbers of pgens fit around them. This means that a factory that is 50% surrounded with 8 T1 pgens will receive the same bonus as, a radar surrounded by 2 T1 pgens - 12.5% for both.
In this table the discount percentages are shown for a fully surrounded structure.

Buildings which give Energy discount bonuses

Energy Producing Structures	Discount Percentage	Typical Discount value	Comments
T1 Power Generator	25%	1-5	Useful next to radar, air factories, not great next to land factories, but should still be used.
T1 Hydrocarbon Power Plant	12.5%	10-50	% value for ONE Hydro shown. Useful next to T1/2 air Factories, generally useful.
T2 Power Generator	50%	20-100	Useful next to T2 air Factories.
T3 Power Generator	75%	200-750	Very Useful next to T3 air Factories.
T4 Paragon	0%	0	Useless - better to shield it.

It should be noted that mass extractors consume energy to generate mass, but T1 pgens should only be used for adjacency when the extractor is upgrading from T1 to T2 very early in the game, to save some energy while upgrading.

Production Bonus

Any structure which produces a resource, when placed next to a storage of that resource, will produce a bonus percentage of that resource. This is most commonly seen when mass extractor are surrounded by storages to increase their mass income.

• Bonus is 12,5% per fully surrounded side by storages.
  • Maximum is 50% bonus income for fully surrounded building by storages.

Mass

Buildings which are affected by mass storages

Mass Producing Structures	Production Bonus for one storage	Production Bonus for all storages	Comments
T1 Mass Extractor	+0.25	+1	Not very useful. Also not obvious due to how the game rounds the displayed values, same for t2 fabricators.
T2 Mass Extractor	+0.75	+3	Useful.
T3 Mass Extractor	+2.25	+9	Very Useful.
T2 Mass Fabricator	+0.125	+0.5	Not Very Useful, unless the storages are next to an extractor.
T3 Mass Fabricator	+0.667	+6	Not Very Useful - better to place near t3 Pgens, same for t2 mass fabs.

Energy

Buildings which are affected by Energy storages

Energy Producing Structures	Production Bonus for one storage	Production Bonus for all storages	Comments
T1 Power Generator	+2.5	+10	Almost useless due to the explosion when the storage dies.
T1 Hydrocarbon Power Plant	+4	+50	Almost useless due to the explosion when the storage dies.
T2 Power Generator	+27.78	+250	Almost useless due to the explosion when the storage dies.
T3 Power Generator	+78.125	+1250	Almost useless due to the explosion when the storage dies.

Weapon Bonuses

Placing Power Generators next to energy consumig weapons will reduce the reload time of the weapon, and the duration of energy consumption. All static artilleries benefit from the rate of fire bonus. UEF T3 Point Defense is an exception and gains a reduction in energy drain instead.

Rate Of Fire Bonus

When placed next to power generators, static artillery units gain a rate of fire bonus which can be very significant, especially when considering that a 60% reload time can be achieved, and how much cheaper 4 T3 power generators are than a T3 artillery installation.

The values in this table are given when an artillery is completely surrounded by a specific power generator.

Reload Time discount on Artillery structures

Artillery Unit	T1 Power Generator	Hydrocarbon Power plant	T2 Power Generator	T3 Power Generator	Comments
T2 Artillery	2s	5s	5s	8s	T1 pgens useful, especially with multiple artillery structures.
T3 Artillery	1s	2.5s	2.5s	4s	Very useful with T3 pgens, or any pgens. Note: Aeon artillery has twice the reload time, and so twice the discount.
T3 Rapid-fire Artillery	0.31s	0.775s	0.775s	1.24s	The size allows you to surround it with a T3 and T1 pgen, or a T2 and two T1 pgens on each side.
T4 Artillery	0.8s	2s	2s	3.2s	Very useful with T3 pgens, or any pgens.
T3 Ravager	0s	0s	0s	0s	Only profits from energy consumption reduction (see table below). Quite useless.

Energy Consumption Reduction

The rate of fire bonus reduces the time structures consume energy, but keeps the drain the same. As a result they consume less energy. An exception to this is the T3 UEF point defense which has an energy drain reduction. Makiing decisions around this behaviour is not recommended as the energy reduction is very low compared to the resources invested. This table is mostly to provide you information of how it works.

Buildings which give Energy discount bonuses

Energy Producing Structures	Discount Percentage	Typical Discount value	Comments
T1 Power Generator	10%	15-750	Useful next to all static artillery, especially T2, when safety is important
T1 Hydrocarbon Power Plant	20%	30-1500	Useful next to T2/T3 static artillery
T2 Power Generator	20%	30-1500	Useful next to T2/T3 static artillery
T3 Power Generator	40%	60-3000	Useful next to T3/T4 static artillery