A computer includes a processor and a memory storing instructions executable by the processor to receive data indicating a plurality of tasks to be performed at a site by a plurality of electric machines, receive charge statuses of the electric machines and of a plurality of first electric vehicles at the site, and generate an ordered allocation of a plurality of charging operations for the electric machines and first electric vehicles based on the plurality of tasks and on the charge statuses. The charging operations include charging at least one of the electric machines or first electric vehicles from a second electric vehicle with charge ports that is scheduled to visit the site from offsite.