The developed and developing countries have ambitious plans
to generate solar power for a better environment. Thus,
adopting solar innovations is integral to creating a green
world. This study proposes a framework integrating the
factors that affect consumers’ decisions to adopt or reject
solar innovations. For this purpose, we used a systematic
literature review to gather potential technology acceptance
theories and factors investigated in these studies. Out of 1531
initially searched articles, twenty-four (24) were found
relevant and screened fully. The findings revealed that the
Diffusion of Innovation (DOI) theory was dominant in
evaluating the solar innovation decision by the consumers,
followed by the Theory of Planned Behaviour (TPB).
Moreover, the DOI’s innovation characteristics (relative
advantage, complexity, observability, compatibility, and
trialability) were the most widely used factors for assessing
solar innovations’ decisions by consumers. The public and
private institutions should consider technological
characteristics and the households’ characteristics to
formulate policies for scaling up the adoption of solar