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Our Team

Neil Lewis – Manager


Neil joined us from Robert Owen Community Banking Fund where he worked as The Community Energy Fund Manager. This multi-award nominated fund helped develop around 20 community owned renewable energy projects across Wales, by loaning over £1.2 million. He previously worked with Menter Cwm Gwendraeth, advising SMEs in rural Carmarthenshire on energy and environmental sustainability.

He is a former Chairman of Abergwili Community Council and has a Masters Degree in Energy and Environment from The University of East London. Neil has worked previously as a Dentist and as Welsh Language Spokesperson for the Marine Conservation Society. His interest in clean energy comes from living his childhood on the edge of a very deep, open cast coal mine. Neil was also a Renew Wales Co-ordinator/Mentor. He has driven electric cars 120,000 miles across Wales and is therefore an expert on the lack of charging infrastructure.

Sioned Haf - Coordinator


Sioned works part-time for Ynni Sir Gâr and is based in Llangadog in the Tywi valley. She has a doctorate from Bangor University on community energy in Scotland and Wales and continues to contribute to research in this field.

She has organised a number of events to raise awareness of the potential of community owned renewable energy projects and created a graphic novel for schools to explore the sector in more depth. Sioned is a director of DEG (Datblygiadau Egni Gwledig) in north-west Wales and Community Energy Wales. Sioned is also a Renew Wales mentor.

Lleucu Meinir - Communications and Community Engagement Officer

After completing a Welsh degree in Aberystwyth, Lleucu worked in the community with Cymdeithas yr Iaith for a year before beginning a period of 15 years working in the broadcast industry. She also organised music events voluntarily across Wales, created photography work and brought up her first born. In 2011 she moved back to her home area to live in west Wales changing the emphasis of her work to be an educator and motivator in the rural communities of Ceredigion and Carmarthenshire through the arts, the relevance of local history and in the field of well-being. Alongside this she ran her photography business, Lluniau Lleucu, and brought up her 4 children. Since 2023 Lleucu has been working as a Communications and Community Engagement Officer with the social company Ynni Sir Gâr.

Vanessa Bolton-Roe - Bwrlwm Project Officer

Mari Arthur - Chair

Mari is currently a Partner at Afallen Cymru LLP and a free-lance marketing and communications consultant specialising in sustainability. Until early 2020 Mari was the Director of Cynnal Cymru – Sustain Wales, and has managed cross-sector projects, with recent focus on the utility sector, vulnerable customers, community engagement, sustainability and the environment.

Based in Trimsaran and Cardiff, Mari has been a Board Member at Ynni Sir Gâr since 2017, she is also a Board Member at Warm Wales and a school governor at Stebonheath School and Ysgol Y Strade Llanelli. Mari also currently sits on Dŵr Cymru’s Customer Challenge Group and Wales & West Utilities Customer Engagement Group and Chairs Dŵr Cymru’s Independent Environmental Advisory Panel.

Tom Defis - Treasurer

Tom has a been a Carmarthenshire County Councillor for Carmarthen Town West since 2012. He is on the Social Care and Health Scrutiny Committee and Housing Review Panel (Substitute) for the county and is a school governor of the Welsh medium schools Bro Myrddin and Ysgol y Dderwen. He is also the Christian Aid coordinator for West Wales, an organisation that works to eradicate poverty and tackle the effects of poverty as well as its root causes.