"This will allow quicker implementation of marine renewable energy projects and reduce their cost", the government said.
For all new projects awarded under competitive tenders where the site is allocated to the winning bidders, grid operator RTE will bear the costs, included stranded costs in the event of the tender being abandoned.
RTE will then recover the costs from charges levied on large industrial consumers.
The grid operator will also have to compensate developers for any delay in delivering the connection, and will have to compensate plant owners for any damage to the grid connection or malfunction attributable to RTE resulting in a partial or total loss of connection, up to a limit to be fixed by decree.
The first project to follow the new rules will be 250-750MW being tendered off Dunkirk.