Register Events.Solar Sites > Summit > Register Community Solar Power Summit returns in Summer 2019! Receive future event updates Membership Information Discounted registration rates are available for national SEIA, SEPA, and CCSA members. You must be a member in good standing to receive the member rate for Community Solar Power Summit. Why Join? SEIA Membership Benefits SEPA Membership Benefits CCSA Membership Benefits Join SEIA Contact SEIA via email or by phone. membership@seia.org 202-682-0556 Join SEPA Complete the form or contact SEPA by phone. Membership Form 202-857-0898 Join CCSA Complete the form or visit the website. Membership Form 202-888-6252