A good place to start is support organisation Durham Community Action. They offer free, impartial advice to community groups and organisations across the county. They also provide advice and information to tackle specific queries, issues, and concerns and to help to find solutions to problems, can help to develop new and existing projects and initiatives and can provide hands on help or tailored resources, including training for trustees and volunteers, governance advice and help with funding access, business planning, and funding applications.
Durham 4 Community have access to information on a range of sources of funding which could help you.
The Business Energy Efficiency Project (BEEP), partially funded by the European Reginal Development Fund, operates in the County Durham area. It offers energy audits and grant funding for SMEs that are looking to make changes to improve their energy efficiency and reduce their carbon emissions. This can be anything from upgrading heating systems to installing wind turbines and overhauling your lighting systems.