caiso notification demand relief program settlement charge types reminder summer 2001 iso demand relief program charges reflected june 30 statements june invoices announced previously year iso developed summer 2001 demand relief program drp program designed provide additional level demand reduction iso system implemented stage 2 emergency effort prevent involuntary load curtailments rotating blackouts associated stage 3 emergency similar last years program charge types utilized capacity charge type 7 117 described first link two new charge types 3472 3482 created energy payment allocation contracted loads called upon curtail described second link although program initiated june calls made curtail load therefore charges 3472 3482 utilized periods demand relief program called upon initiate interruptions contracted loads found third link charge types 7 117 description charge types 3472 3482 description 2001 drp load curtailments keoni almeida california independent system operator