Can Ocean Wave Energy Be Cost-Effective?

The more I read about this, and the more time passes (perpetually bringing down the cost of solar and wind), the more I doubt it.  Having said that, here’s an article on the use of wave energy in Africa.

The project developer writes:  The technology can achieve a power generation cost as low as USD 0.02 per kW (sic), …. compared to USD 0.03/kWh for coal, USD 0.12 for solar and USD 0.036 for wind. 

“Can” achieve?  Under what circumstances?  Sorry, but this is total horse hockey.