The underwater electricity cable between Jersey and Guernsey will be replaced.
Guernsey Electricity say the decision follows 'a comprehensive examination of the condition of the cable, which identified inherent design and manufacturing issues'.
The GJ1 cable links Guernsey to France, via Jersey, but it has been working at a limited capacity since an island-wide power cut on October 1st last year.
Guernsey has since been reliant on the power station in the Vale for two-thirds of it's electricity.
The electricity provider say a replacement cable will ensure 'a more secure and affordable supply of electricity'.
The cost of replacing the cable, however, could be passed on to customers.
The energy company are working with the Channel Islands Competition and Regulatory Authorities (CICRA) to 'recover historic operating costs and adjust tariffs to reflect changes in future costs, particularly for the replacement of cables'.
Guernsey Electricity say tariffs haven't changed since October 2012, and the underlying costs of powering the island have increased.