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Leadership Team

Mike Costelloe

Mike Costelloe

Chief Executive Officer

Mike joined Delta in June 2017. He has wide experience in the highly competitive contracting sector, predominantly in civil infrastructure. Mike has previously held a number of senior management roles, in both New Zealand and Australia. Since January 2015, Mike has been General Manager, Strategic Accounts Downer New Zealand. Prior to that, he was General Manager Otago/Southland Downer New Zealand.

Jolene Lynn

Jolene Lynn

Executive Assistant

Jolene joined Delta in June 2020 as Executive Assistant to the CEO. Jolene is responsible for executive, administrative and management support to the CEO and Board of Directors. Jolene has previously worked in a variety of administrative and management support roles for organisations within the infrastructure and healthcare sectors.

Hayden Wingfield

Hayden Wingfield

Chief Financial Officer

Hayden (BCom, Dip Grad, CA) joined Delta in February 2014. He is responsible for the financial accounting and financial risk operations of our business. A Chartered Accountant, Hayden has a wide range of experience in the commercial and financial sectors. He began his career at Deloitte in the Audit and Risk team and was a Senior Manager at Heathrow Airport prior to joining Delta.

Michael Price

Michael Price

General Manager Power and Communication Services

Michael (MBA, NZCE Electrical, REA, MInstD) joined Delta in March 2017. He is responsible for the delivery of contracting services to our electrical and communication customers. Michael has nearly 40 years of operational experience, predominantly within the electricity distribution sector, but also across other industries. He has held senior management roles at PowerNet, United Networks, NZ Post and most recently the Earthquake Commission (EQC).

Richard King

Richard King

General Manager
Greenspace Services

Richard (BAppMgt, Nat. Cert. Sports Turf Mgt) joined Delta in 2001 and was appointed General Manager Greenspace Services in 2015. He is responsible for Delta’s delivery of greenspace services, including sports turf management, ecological and horticultural services, roadside vegetation control, tree services, and park and reserve maintenance, for local government and private sector customers. Richard has over 35 years’ experience in greenspace services, primarily in the amenity horticulture and sport turf industries. He leads a highly skilled team of over 240 people during peak seasons, across ten locations throughout the South Island.

Josh Butterfield

Josh Butterfield

General Manager Metering and Field Operations

Josh (MBA MCPM BA) joined Delta in December 2021. He is responsible for the delivery of our metering and field service operations at Delta. His business unit spans across all New Zealand networks and provides services to a wide range of electricity retailers and meter owners. Originally from the United States, Josh started his career with Sprint Corporation and, since arriving in New Zealand in 2005, has gained extensive experience in the telecommunication and electricity sectors. He has held management positions with Telecom, Mercury NZ, Vector, Prysmian NZ, The Lines Company, and Influx Energy Data.

John Llewellyn

John Llewellyn

General Manager People and Capability

John (BAppMgt, CMHRINZ, Assoc CIPD) joined Delta in April 2012. He is responsible for leading our People and Capability program, which includes human resources, payroll, marketing, communications and training. John has over 30 years’ experience in human resource management and has held senior roles at the Otago Polytechnic and UniServices, part of the University of Auckland. John is a chartered member of the HR Institute of New Zealand.

Matt Sadgrove

Matt Sadgrove

Health and Safety Manager

Matt (PGDipHlth, Grad NZISM) joined Delta in July 2014. He is responsible for the health and safety operation of our business. Matt has a wide range of experience and has been a health and safety specialist for over 10 years. Previously, Matt held production and safety roles at Silver Fern Farms, as well as a variety of roles outside the industry. Matt is an active member of the New Zealand Institute of Safety Management and the Electricity Distribution Institute Safety forum.

Shane Spicer

Shane Spicer

Commercial Manager

Shane (NZCQS, PMP, NZC Const. Man. L5) joined Delta in December 2012 as the Technical Services Manager. In 2016 Shane moved into the Commercial Manager role with responsibilities in the risk and quality assurance portfolios, as well as leading the newly created Major Project Group. Shane started in the high voltage Transmission and Generation industry. He has held a number of senior roles, including Regional Manager for the then, Transfield Services, and Senior Projects Manager for a large multinational company, where he was responsible for tendering and managing major infrastructure renewals and upgrades across New Zealand.

Daryl Putt

Daryl Putt

Business Accountant

Daryl (BCom, Dip Grad, CA) joined Delta’s predecessor Dunedin Electricity Ltd in July 1997. He is responsible for ensuring accurate and robust management accounting practises as well as effective and efficient business processes. Daryl has held a number of roles within the finance group at Delta, gaining a wide range of experience within the contracting and energy sectors, which began over 25 years ago at Taranaki Energy Ltd. He undertook his tertiary education part time, while also working full time at Delta and gained his Chartered Accountant qualification in 2007.