Many of the major granting agencies now require that all publications paid for by their grants be made Open Access within 12 months of publication.
The three main Canadian government agencies have an open access policy that applies to all grants awarded after May 1, 2015.
http://onesearch.library.utoronto.ca/triagencyopenaccesspolicy
Canadian agencies - NSERC SSHRC CIHR: http://www.science.gc.ca/default.asp?lang=En&n=F6765465-1
US agencies: http://libraries.mit.edu/scholarly/publishing/research-funders/
There is a big advantage to making articles open access - it has been proven to increase readership and citations:
Wang, Xianwen; Liu, Chen; Mao, Wenli; Fang, Zhichao (2015-05-01). "The open access advantage considering citation, article usage and social media attention". Scientometrics. 103 (2): 555–564. arXiv:1503.05702 doi:10.1007/s11192-015-1547-0
Note this article has been cited 75 times from the journal webpage but 140 times on Google Scholar which includes the open access version.
Davis, P. M. (2011). "Open access, readership, citations: a randomized controlled trial of scientific journal publishing". The FASEB Journal. 25(7): 2129–34. doi:10.1096/fj.11-183988
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