Power is a resource in Screep's that is used in increasing a user's Globasl Power Level by feeding it into a powerSpawn and executing https://docs.screeps.com/api/#StructurePowerSpawn.processPower at the cost of 50 energy per 1 power. Global Power Level allows you to spawn powerCreeps which have special powers and are considered the hero units of screeps. Power is also a resource that can be sold/bought in the market. It is naturally created in PowerBanks which spawn in highwayrooms on the map.
Power-banks are structures that spawn in highway rooms and contain power. They exist for 5000 ticks, decaying at a rate of 1 per tick. They will contain some amount of power (randomly) between 500 - 10,000. They have a health of 2,000,000 hits and need to be destroyed to drop the power, which they will in a ruin for 5 ticks, then on the ground subsequent ticks. Attacking a powerBank reflects half of the damage back to the attacking creep.
Power harvesting is action of locating, destroying, and retrieving power from powerBanks. You first need to locate a powerBank in a highway room via creep scout or Observer, then spawn creeps to attack it, and creeps to heal (or however you choose to configure your creeps). You then need to attack the bank till it runs out of HP, once dead, it is wise to have carrier creeps already in position to take the power from the ruin/ground and transport it back to one of your rooms for processing/the market.
Power creeps are considered hero units in screeps, they have their own unique look and while they do have ticksToLive of 5000, they are effectively immortal as even if they die they can be respawned after a short cooldown of 4 hours. You create powerCreeps with your Global Power Levels on the manage power creeps section of your overview page, and then spawn them into the world using https://docs.screeps.com/api/#PowerCreep.spawn and a powerSpawn. Their TicksToLive can be extended by using https://docs.screeps.com/api/#PowerCreep.renew targeted at a powerSpawn or powerBank, and they will have a carry capacity & Hit points based on their level. Powercreeps can use a variety of powers which most cost a resource tied to that type of creep. Currently, the operator creep is the only powerCreep released.
PowerCreeps can be level 1 - 25, each level costs more GPL then the previous and can be put into one of the power creep's powers to increase its effectiveness (or grant it a new power, if no levels were previously assigned).
The first released class of powerCreep, operators can handle a wide vareity of tasks from economy to defense and attacking. They have several powers, some which cost the resource Ops, but not all cost this resource to use.
A power that generates the resource Ops that is used in a variety of the operator's powers as a required resource. It can also be sold/purchased though the market. It has five levels, which each increase the amount of ops generated per power used and the power has a cool down of 50 ticks.
A power that reduces the time it takes to spawn a creep, it must be used on a specific spawn and lasts for 1000 ticks. It costs 100 ops to use, and the reduction varies on the level(s) in operate_spawn
Announced, but awaiting release. The creep is stated as of last update to be a creep that works alone and if effective at Attacking & Economy.
Announced, but awaiting release. The creep is stated as of last update to be a creep not useful on its own, but most powerful with other creeps that directly affects individual or groups of creeps.