Renewable energy technologies have become increasingly important in addressing electricity access challenges in off-grid communities worldwide. A mixed-methods approach combining statistical analysis and qualitative interviews was employed to gather data from 150 households across three Tanzanian regions, focusing on solar home systems (SHS) and mini-grids. Electricity access rates increased by 40% among SHS users and by 35% among mini-grid users, with notable improvements in lighting and cooking activities. Renewable energy technologies significantly enhanced household productivity through improved energy efficiency and the introduction of new income-generating activities. Government policies should prioritise investment in renewable energy infrastructure and support for community-led initiatives to accelerate access and adoption.