Willdan Group, Inc. provides professional, technical and consulting services primarily in the United States. The Energy segment offers comprehensive audit and surveys, program design, master planning, demand reduction, grid optimization, benchmarking analyses, design engineering, construction management, performance contracting, installation, alternative financing, and measurement and verification services. Engineering and Consulting segment provides building and safety, city engineering and code enforcement, disaster recovery, geotechnical and earthquake engineering, planning and surveying, contract staff support, and other services.