Energy Assessor and Distributor at 1st4solar. Energy Assessor Providing an independent, low cost, highly responsive personal Energy Performance Certificates (EPC) Service at an unbeatable price for existing and new build domestic and commercial properties. In addition provide Standard Assessment Procedure (SAP) Calculations for new build properties. Distributor at 1st4solar Providing a complete sales, design and installation service for Photovoltaic (PV) Solar Panels for your home or business. Part of the UK Government “Clean Energy Cashback Scheme” – Your roof could earn you up to £2000 per year.