Willdan Group, Inc.

Willdan Group, Inc. is an engineering and energy services firm headquartered on East Katella Avenue in Anaheim, California, incorporated in Delaware and listed on Nasdaq as WLDN. The company works across energy infrastructure engineering, grid modernization, utility program delivery, design-build energy performance contracting and municipal engineering for public agencies. Power delivery has become its fastest-moving line as data center, battery storage and electrified industrial loads overwhelm utility engineering capacity. In August 2026 Willdan acquired substantially all the assets of KCS Corporation, a suburban Chicago substation and transmission engineering firm founded in 1999, adding a 15-person team that had already been working alongside Willdan on substation and renewables projects.

Willdan organizes its work into six solution groups, and the mix is wider than the energy label suggests.

Energy and Sustainability covers grid optimization, energy efficiency, energy planning and energy design assistance. Engineering is a separate group and holds the municipal practice the company has run since its early years: building and safety, code and fire, city engineering, construction management and inspection, civil design engineering, and planning services for public agencies. Program Administration handles energy program design and delivery plus staff augmentation for utilities that need more capacity than they can hire. Design-Build and Energy Performance Contracting delivers turnkey retrofit projects with custom technology solutions. Financial, Economic and Strategic Planning covers real estate and economic development, public finance consulting, financing and revenue optimization, and market price forecasting. A sixth group handles software, smart cities and microgrids, and emerging-technology studies.

That structure lets a single firm write a municipality’s fee study, design the retrofit and then run the utility incentive program that helps pay for it — a combination that normally requires three separate vendors.

Markets served

Nine named markets: utilities; government and public sector; K-12 and higher education; healthcare; hospitality; telecom and data centers; small business and commercial; industrial; and multifamily housing. Telecom and data centers is the newest of the nine, and it is where the power delivery workload is concentrating.

Scale, leadership and contact

The company describes itself as 60-plus years strong, tracing its start to 1964, and employs roughly 1,500 people including licensed engineers, program and construction managers, financial analysts and planners. Michael A. Bieber has been chief executive officer since December 30, 2023, after seven years as president; Creighton K. Early serves as executive vice president and chief financial officer. Corporate headquarters are at 2401 E. Katella Avenue, Suite 300, Anaheim, California 92806, and the general corporate line is (800) 424-9144.

Willdan publishes an annual sustainability report covering its own operations alongside the savings and emissions reductions it delivers for clients. For an agency with its own climate commitments to document, that report is worth reading before drafting an RFP.