Savings Opportunity Assessment. A written report that Prenova provides as new rate/tariff opportunities arise. Prenova reviews the current supplier, the new supplier, evaluates the newly proposed rates/tariffs, and delineates the new annual spend and associated savings. Based on market conditions and the customerâ€(tm)s risk profile, Prenova recommends contract terms. Prenova also provides a risk analysis in terms of making any change, including relevant risk mitigation actions.