- Solum GB is a multi-award winning company that specialises in the design, supply & installation of renewable energy systems. From our Head office in Dorset we have carried out installations throughout the United Kingdom. Our main areas of expertise are Air source heat pumps, Solar photovoltaic and Solar thermal systems. Being at the forefront of the renewable industry means we recognise the potential pitfalls associated with projects of any size or complexity. It is through our extensive experience that we are able to offer our clients the most practical and economical solution to meet their individual needs. We understand that each project is different and as such place huge importance upon the way in which we approach each job, from the initial enquiry all the way through to installation and handover. We make the transition from conventional to renewable as seamless as possible.