The results were revealed as part of the government's Department of Energy and Climate Change (Decc) annual figures on energy production in the UK.
Offshore wind projects produced 11,441GWh of electricity last year, up from 7,549GWh in 2012. The increase has been attributed to increased capacity and stronger wind speeds during 2013.
Decc also revealed that offshore and onshore projects achieved equal or greater load factors than gas. Offshore wind's load factor reached 37.5% while onshore wind matched gas with a 27.9% capacity factor.
Capacity factor, is percentage of energy produced compared to the maximum potential production capacity.
All together, renewable energy production increased 30% year-on-year and made up almost 15% of the UK's total electricity production.