Pursuant to Section 1804(a), a customer who intends to seek an award for intervenor compensation must file an serve on parties of record a notice of intent (NOI) to claim compensation. The filing must be made within 30 days after the prehearing conference is held. UCAN timely filed its NOI after the first prehearing conference for this RDW segment of the proceeding, and was found to be eligible to request intervenor compensation by ALJ ruling dated March 6, 2000.