1. Innovation: Look for startups that are creating new and innovative solutions to energy-related problems. This could include new technologies, business models, or approaches to energy management and conservation.

2. Impact: Evaluate the potential impact of the startup's solution on the energy industry and society as a whole. Consider the scale of the problem being addressed and the potential for the solution to be scaled up and adopted widely.

3. Viability: Evaluate the financial and technical viability of the startup, including its revenue model, funding sources, and potential for profitability.

4. Sustainability: Consider the sustainability of the startup's solution, both in terms of environmental impact and long-term viability.

5. Team: Consider the experience and expertise of the startup's team members, as well as their track record in the energy industry or related fields.