Disposal

When an asset is replaced or has reached the end of its useful life, it must be decommissioned, recycled, or disposed of. Which action is taken depends on the asset and the needs of the utility. 

Decommissioned
Recycled or Repurposed
Removed
The asset is no longer being used and is left in place. This can occur because the asset is too large to move and/or the location is not needed for a replacement asset.
Metal, or maybe some plastics, can be recycled. Assets that no longer function for their intended purpose might be repurposed into other items that help the utility or can even be used as educational pieces.
The asset is being exchanged with a new or upgraded asset and must be taken out to make room for the replacement.

With any method of disposal, consider any special handling requirements and take precautions with any materials regulated at the federal or state level.