## Giant Battery Storage Projects Offer Potential for Wales, but Safety Concerns Persist
The expansion of Battery Energy Storage Systems (BESS) across Wales has sparked both enthusiasm and concern among politicians, local residents, and environmental campaigners. While battery storage is seen as pivotal for the nation’s transition to renewable energy, worry is growing about the proximity of these large projects to homes and schools—prompting renewed calls for stricter government oversight.
Wales, recognised as the fifth largest electricity exporter globally, has been at the forefront of renewable energy production. Solar, wind, and other green energy sources already generate a surplus, with battery storage seen as the critical next step to maximise and harness these gains. BESS facilities work by storing surplus clean energy and releasing it back into the grid when needed, ensuring no renewable electricity is wasted and the supply remains stable despite the inherent variability of renewables.
Advocates, including Plaid Cymru Senedd Member Llyr Gruffydd, stress that these large-scale battery projects are essential for hitting net zero emission targets. Not only do they offer environmental benefits, but they also create new opportunities for local economies, including jobs in engineering, green technology, and energy innovation. For industries with high energy demands, such as steel manufacturing, reliable access to affordable clean energy could be transformational.
Despite these broad positives, serious questions are being raised regarding the regulatory framework—or the perceived lack thereof—surrounding the placement and safety of BESS sites. Many of the new proposals are not confined to isolated industrial parks or brownfield land; instead, they are being sited within metres of residential communities, schools, and working environments. This proximity has led to increasing resistance from local residents, citing risks associated with battery fires and potential exposure to hazardous materials.
Concerns about safety are far from hypothetical. Earlier this year in Moss Landing, California, a fire at a major battery storage facility destroyed almost 80% of batteries in a single building, forcing the evacuation of over 1,000 residents and causing toxic smoke emissions. In the aftermath, elevated levels of heavy metals, including manganese, cobalt, and nickel, were detected, raising alarms about the risks to public health and the environment. Incidents like this have resonated in Wales, stoking anxiety about whether similar events could occur closer to home.
One of the most controversial plans is the proposed Ynni Celyn project by NatPower in Gwyddelwern, Denbighshire. If approved, it would become one of the largest BESS installations in Europe, comprising millions of batteries housed in around 1,000 shipping containers on a 75-acre greenfield site adjacent to a small village. Local campaign groups have rallied in objection—not only over the sheer scale and siting of the facility but also over concerns about ongoing engagement and transparency from the developers. Similar fears are being voiced in other Welsh communities facing BESS proposals, including Northop and Rhostyllen.
Critics argue that the current planning environment feels like a ‘free-for-all’, with developers racing to file projects against a backdrop of uneven scrutiny and unclear safety standards. Gruffydd and others are urging the Welsh Government to step in with a national framework which would balance industry interests with the rights and welfare of local communities. This would include clear, science-based criteria for where such projects can be located and how they should be managed.
Amongst the key recommendations being put forward is a moratorium on the approval of large BESS installations—specifically, those above 250MWh in energy capacity and within one kilometre of residential property. Such measures would mirror emerging international standards, such as new safety rules adopted in California following the Moss Landing incident. The idea is to pause development long enough to conduct a full, independent risk assessment into the safety and environmental impacts of large-scale BESS.
Calls for action reflect a wider debate: how to reconcile the urgent need for sustainable infrastructure with legitimate public concerns. Clean energy is recognised as a cornerstone of future Welsh prosperity, but campaigners insist that development must not compromise safety or sideline affected communities. A transparent and participatory planning process is being demanded to ensure that progress towards a net zero Wales remains both responsible and equitable.
As Wales continues to shape its energy future, the challenge will be to foster innovation while maintaining public trust. The lesson from recent events remains clear: for clean energy to be truly sustainable, it must also be safe and community-driven. The coming months are likely to see further debates, as authorities consider tougher national planning policies and the results of any government-led risk assessments. The decisions made now will set the course towards a Wales that is not only green, but also inclusive, resilient, and deserving of public confidence.