55 million kwh is 55 GWh, not 55 MWh. Hence the GPs implied question about a 500% capacity factor.

The answer lies in the press release, the 55 GWh is over the 25 year PPA:

http://www.solamericaenergy.com/news/carter-farms/

Implying a 25% capacity factor.

edit: more like a 19% capacity factor. Whatever, something sensible, the reporter screwed up calling the output annual.