It's almost certainly a "job-year" [1] which is an economic construct representing the equivalent of one person being employed for one year. For example, a 6 month construction project with 2 guys still equals one job year.

Most PR-style announcements like this seems to simplify job-years to jobs.

There is also direct employment (# of people hired for the project itself, e.g. construction) vs indirect employment (# of people hired in supply chain) vs induced employment (# of people hired by associate economic impact, e.g. construction worker spends money earned on project in local community and supports retail) [2], all of which may be consolidated for a PR style announcement.

[1] http://prospect.org/article/what-heck-job-year [2] https://msu.edu/user/stynes/mirec/concepts.htm

In the end, half of everything you pay for anything is labor. 100B / 100,000 jobs = 1M / job. Sounds about right to me! Remember that they will need to manufacture the panels, transport the panels, prepare the sites, build the structures, maintain the system, build power lines, maintain power lines, sell the power ... that's a lot of jobs that have to be done!