The article "Perspectives on Demand Side Energy Efficiency" explores how energy systems engineering can guide decisions on improving energy efficiency in the system. Researchers studied two local energy planning cases and found that consumers invest less in energy-saving measures than recommended, hinting there are unexplored aspects affecting these decisions. They also analyzed energy efficiency activities at a public energy utility and discovered that most were focused on increasing energy sales, aligning closely with traditional practices. The comparison showed that existing methods may overlook vital connections between energy efficiency efforts and sales strategies. Overall, the research emphasizes the need for a better understanding of how energy efficiency activities are intertwined with energy sales at utilities.