<p>SACRAMENTO – The Senate on Monday approved Michael Kahn for another term as head of the state's power-grid operator. Kahn, a San Francisco lawyer and appointee of Gov. Gray Davis, was approved in a 36-1 vote. The lone dissenting vote came from Sen. Joe Dunn, D-Santa Ana, who said the board failed to ride herd on the grid's top staff during the state's electricity crisis. Kahn heads the five-member board - two seats currently are vacant - that oversees the Independent System Operator, an agency that was created by California's 1996 electricity-deregulation law. The ISO has 572 employees and a $170 million budget.</p>