Organizational Structure

The Transmission Agency of Northern California (TANC) is governed by a Commission consisting of one representative from each of its Member utilities. The TANC Commission annually elects a Chair and four Vice Chairs, of whom one also serves as Secretary, from among its Commissioners.

TANC’s General Manager is responsible for the day to day management and operation of TANC. This responsibility extends to all TANC’s activities including management and oversight of contracts. The General Manager reports directly to the TANC Commission and receives policy guidance from the Commission.

Officers and Staff

Manjot Gill
Turlock Irrigation District

Vice Chair
Ann Hatcher
City of Santa Clara/Silicon Valley Power

General Manager (Interim)
John Roukema

Russell Mills

Assistant Treasurers
Jon Anderson
Greg Pochy

Lisa Limcaco

Assistant Controller
Kathy Ketchum

TANC/COTP Representatives

Management Committee (MC) Chair
John Roukema

MC Ex Officio Member and Secretary

E&O Committee
Brock Costalupes

Administrative Representative (OCOA)
John Roukema

Reclamation District
2024 Trustee Don Wagenet


Audit/Budget Committee

The TANC Audit/Budget Committee reviews monthly reports highlighting the financial performance of the Agency. In addition, the Committee prepares the annual budget and assists in an annual audit.

Sondra Ainsworth (Northern California Power Agency), Chair
Larry Riegle, Ex-Officio Member and Secretary

Contracts Committee

The TANC Contracts Committee reviews and provides recommendations to the TANC Commission on contractual and regulatory matters impacting TANC, TANC Members, and TANC assets.

Basil Wong (City of Santa Clara), Chair
John Roukema, Ex-Officio Member and Secretary

Engineering & Operations Committee

The TANC Engineering & Operations Committee representatives review the operations and maintenance activities on TANC-owned high-voltage electrical facilities including the California-Oregon Transmission Project.

Brock Costalupes (Modesto Irrigation District), Chair
Open, Ex-officio Member and Secretary

Finance Committee

The TANC Finance Committee reviews and provides recommendations to the TANC Commission regarding TANC’s financial program. The Finance Committee works closely with TANC’s Treasurer and financial advisors.

Russell Mills (Sacramento Municipal Utility District), Chair
Open, Ex-Officio Member and Secretary

Open Access Transmission Tariff (OATT)

The OATT Committee oversees the implementation of TANC’s OATT and Open Access Same Time Information System (OASIS) activities.

David Olivares (Modesto Irrigation District), Chair
John Roukema, Ex-Officio Member and Secretary