Guernsey Electric Light and Power Co
1907 Company formed
1908 and 1911 diesel generators were installed at both power stations, increasing capacity to 1,340 kW.
1918 An explosion at the Vale power station left the road covered in debris.
1933 The States of Guernsey acquired the business at a cost of £285,500 at which time the capacity was 3.73 MW with 2,928 consumers on 165 kilometres (103 mi) of cables with eight substations. It would be supervised by the States Electricity Board.
1934 Introduced a 50 Hz 230 V AC supply,.
1938 The last coal-fired generator was retired as new fuel tanks were built to store oil.
By 1939 an additional 110 km of mains cables were installed with 17 additional substations built and 6.9m units were sold a year to 5,774 consumers.