Nine ESS sites installed (eight commissioned). O&M: $66,150 for extended warranty (for all ESS), Power = $25,394 (for all ESS). Communication = $27,892 (for all ESS). Communication was a mixture of direct phone and freewave radio. Direct phone averaged $37 per month. Direct power averaged $25 per month. Three sites also used a power module with generator backup. Propane costs were around $1,400 per quarter. Not all ESS sites were the same. Some were pavement sensor only sites.