Willdan Group Inc is a provider of professional technical and consulting services to utilities, private industry, and public agencies at all levels of government. It operates in the business segments of Energy and Engineering and Consulting. It generates the majority of its revenue from the Energy segment, which includes services such as audit and surveys, program design, master planning, benchmarking analyses, design engineering, construction management, performance contracting, installation, advances in software and data analytics, and other services. All of its revenue is derived from the domestic market.