▁company ' s ▁largest ▁clients ▁include ▁international ▁energy ▁companies , ▁energy ▁consum ers , ▁govern ments , ▁util ities , ▁technology ▁companies , ▁and ▁financial ▁institutions . ▁Many ▁of ▁them ▁attend ▁" C ER A Week ", ▁the ▁company ' s ▁annual ▁conference ▁held ▁at ▁the ▁Hil ton ▁Amer icas ▁Hotel ▁in ▁Houston , ▁Texas . ▁Daily ▁programs ▁usually ▁revol ve ▁around ▁the ▁topics ▁of ▁oil , ▁natural ▁gas , ▁electric ▁power , ▁renew ables , ▁and ▁technology . ▁ ▁Past ▁ke yn ote ▁speech es ▁have ▁been ▁given ▁by ▁the ▁energy ▁secret aries ▁and ▁minister s ▁of ▁Sa udi ▁Arab ia , ▁Ira q , ▁Mexico , ▁Norway , ▁and ▁the ▁United ▁States . ▁Other ▁notable ▁speak ers ▁have ▁included ▁former ▁United ▁States ▁Secretary ▁of ▁the ▁Tre as ury ▁Robert ▁Rub in , ▁United ▁States ▁Secretary ▁of ▁Energy ▁Samuel ▁Bod man , ▁former ▁Colorado ▁Senator ▁Gary ▁Hart ; ▁former ▁United ▁States ▁Secretary ▁of ▁Com merce ▁Donald ▁L . ▁Evans ; ▁former ▁Federal ▁Reserve ▁Chair man ▁Alan ▁Gre ens pan , ▁Microsoft ▁CE O ▁Steve ▁Ball mer , ▁and ▁former ▁Secretary ▁General ▁of ▁O PE C ▁R il wan u ▁L uk man . ▁ ▁C ER A ▁also ▁man ages ▁the ▁Up stream ▁Capital ▁Cost s ▁Index . ▁ ▁Pe ak ▁oil ▁As ▁the ▁controvers y ▁over ▁peak ▁oil ▁intens ified ▁in ▁ 2 0 0 6 , ▁C ER A ▁found ▁itself ▁on ▁the ▁optim istic ▁side ▁of ▁predictions , ▁forec ast ing ▁that ▁a ▁peak ▁would ▁not ▁occur ▁before ▁