The document discusses Middle Tennessee Electric Membership Corporation's (MTEMC) transition from a custom Flex-based web dashboard to apps built with Esri's Web AppBuilder and Portal for ArcGIS Server. The goals were to streamline tools, focus on mobile use, eliminate the need for VPN access, and enable use on any device. Challenges included enterprise logins, managing complex map services, consistent access across networks, and avoiding customization. These were addressed through Web AppBuilder widgets, composite locators, basemap templates, and custom widgets for incidents and tracing. The new system increased GIS adoption and prepared MTEMC for future mobile and web applications outside the corporate network.