As hydrogen is incorporated into long-range energy resource plans, utility planners need reliable cost and performance data on electrolyzer technologies. This report provides a high-level overview of that information by summarizing the electrolysis sections of EPRI report Low-Carbon Energy Supply Technology Cost and Performance Study (3002023656) as well as other EPRI reports and external resources. It also suggests considerations for evaluating quotes and reviews the state of electrolyzer technology, the market, and ongoing research.