UK operations

UK electricity transmission network reliability in 2008/09 was 99.9999%, compared with 99.9999% in 2007/08. The average annual availability of the network  was 94.64%, compared with 95.09% in 2007/08.

System availability at winter peak demand was 97.7% in 2008/09 compared with 98.0% in 2007/08.

Our UK gas transmission network reliability was once again 100%

US Operations

In the US, our average annual electricity transmission network availability in 2008/09 was 98.8%. This compared with 98.6% in 2007/08.

The US electricity distribution system average interruption duration for 2008/09 (being the average time the average customer is without power during the year), was 114 minutes, compared with a target of 110-120 minutes.