Residential Frederica, DE Learn how Castle Energy can save you long-term money, and how you can earn $500 in referrals to new customers! Schedule a Consultation I’ve seen this as a way to save money and to save the planet. Sales rep was outstanding. It was wonderful. Diana and Thomas - Frederica, DE Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website