Ten senior officials of Kenya's state-run electricity provider have denied more than six criminal charges - including economic crimes and conspiracy to defeat justice.

The Kenya Power employees, including the current and former managing directors, were arrested on Sunday in connection with the purchase of $45m (33m) worth of transformers - some of which were faulty and cost almost $5m to repair.

They are also accused of issuing irregular contracts and overcharging customers. The electricity provider said business operations would not be affected by the arrests.