The shipping industry is a major source of global greenhouse gas emissions and there is a pressing need for sustainable practices in response to the growing concern of climate change. An equally effective solution is the deployment of regenerative sources of energy on ships, which implies a major emission and energy saving. This article discusses several renewable energy options that can be used on ships, including solar and wind power, as well as carbon capture technology. Its pros and cons are described while highlighting their potential to support the sustainability objectives of the shipping sector. Also, the paper refers to the latest technological developments, such as hybrid propulsion units and fuel cells, which can potentially change how renewable energy is used in maritime applications. Concluding remarks from a regulatory and policy perspective, the article stresses that the shift toward renewable energy should play a key role in providing a sustainable future for the shipping industry.