The latest annual survey of federal employees, conducted by the Office of Personnel Management, finds that there are at least a dozen federal agencies where half or more of employees now telework to some extent.

(Click the image above to see the full Breaking Gov infographic.)

But many barriers remain, despite various efforts to promote telework. As a result, only about 20 percent of federal employees government wide report they are teleworking.

Agencies, however, have a big incentive to keep pushing. The General Services Administration estimates that if federal workers telecommuted at least one day per week, federal agencies could increase productivity by more than $2.3 billion annually. Agencies could also save potentially billions more on office space, electricity and supplies.