The Team

Welcome to our team. If you’d like to get to find out how we can help you transition to a cleaner greener future, please contact us directly.

Gareth Mills, Managing Director

Gareth has over 20 years’ experience in the UK’s Energy and Utilities industry. He started his career as an economic adviser to the UK government on energy related issues, before progressing through senior regulatory and commercial roles at National Grid, Yorkshire Water and British Nuclear Fuels. Gareth joined Northern Gas Networks in August 2005. He has a BA (Hons) Economics and MSc Energy Economics from the University of Surrey.

David Pearson, Finance Director

For 25 years David has held senior finance, commercial and regulatory roles across the UK’s utility, energy and banking sectors. David is a Chartered Global Management Accountant (CGMA) with a BA Economics from Newcastle University. He has led successful commercial bids for data services and asset infrastructure provision contracts in the utility and energy sectors and has had leading roles in assessing and modelling multi-billion-pound acquisitions for the CKI group in the UK. David joined N-Gen as Finance Director in 2023, having worked at Northern Gas Networks (NGN) since 2006. He led NGN’s RIIO-GD2 business planning process, securing over £1bn of funding for the next 5-year price control period, and the modelling that supported NGN’s H21 Leeds City Gate report. This was a pioneering feasibility study which considered whether the conversion of the UK gas network to 100% hydrogen was technically and economically viable.

David Gill, Business Development Director

Prior to joining N-Gen, David was Head of Customer Energy Solutions at Northern Gas Networks (NGN). He has over 35 years’ experience in the energy industry. David is passionate about the future of energy. He was involved in several of NGN’s pioneering energy futures projects including H21, HyDeploy and InTEGReL, liaising with industry partners and lobbying UK decision-makers on the role of hydrogen in a low carbon energy future. David led NGN’s drive for Hydrogen for Transport working closely with local authorities and national government on hydrogen transport trials. Building on his whole system experience, David now leads on business development for N-Gen.

Mark Danter, Engineering and Client Delivery Director

A highly experienced chartered engineer, Mark has a proven track record of delivering multi-disciplinary project programmes including water, LPG, biodiesel, ethanol and white fuels, as well as methane. Mark has worked for various consultancies over the years but has been working for Northern Gas Networks (NGN) since 2012. Over the last six years, Mark has been leading NGNs work on hydrogen, developing strategies for the H21 suite of projects, including bid preparation and implementation for the Network Innovation Competition (NIC) and Network Innovation Allowance (NIA) projects. He was also previously Chair of the ‘Network Safety and Impacts Board’ which is led by the Government’s Department for Energy Security and Net Zero (DESNZ).

Stella Matthews, Head of Programme and Business Operations

Stella has worked in the gas industry for seven years. For five of those years, Stella worked on the H21 project gaining skills and knowledge about how hydrogen could be used as a solution for decarbonising the energy industry. In 2019 she was awarded the Ralph Halkett Travelling Fellowship, which led to her undertaking a work placement with Powerco and First Gas in New Zealand. In her former business development role at Northern Gas Networks (NGN), Stella helped develop and implement NGN’s hydrogen strategy.