Dalian Metro System Uses Energy Intelligence to Cut Energy Usage

The Dalian Metro system, spanning over 66 miles across 50 stations and carrying more than 100 million passengers annually, faced mounting pressure to control energy costs as ridership grew. The city's extreme climate — humid monsoon summers and dry, cold winters — created highly variable HVAC demands, which alone account for 55 percent of total energy usage. With lighting, escalators, safety systems, and other electrical equipment consuming the remainder, operators lacked a centralized, data-driven method to correlate consumption across stations and adjust systems proactively. Without granular visibility into station-level performance, the metro could not respond efficiently to weather shifts or peak ridership patterns.

Engineers standardized on Allen-Bradley Logix controllers, deploying more than 50 redundant MicroLogix and CompactLogix controllers with approximately 100,000 I/O points across all stations. Each station uses paired PLCs to aggregate data from HVAC, elevator, and alarm systems. Rockwell Automation's FactoryTalk software suite was layered on top of this control infrastructure to deliver end-to-end energy intelligence. FactoryTalk Historian collects up to 10,000 data tags per line — including temperature, humidity, and CO₂ concentration — while FactoryTalk View Site Edition provides a redundant HMI for real-time visibility. The FactoryTalk VantagePoint portal converts raw control data into shareable dashboards and trend reports, enabling operators at the Operations Control Center to automate responses — such as ramping up air conditioning during evening rush hours — and intervene manually when unexpected events occur.

Following deployment of the FactoryTalk suite, Dalian Metro achieved measurable improvements in both operational visibility and energy efficiency:

• 12% projected reduction in annual energy consumption across the entire metro system
• 2% annual cost savings projected as a direct result of reduced energy draw
• Operators gained station-level monitoring of all electrical equipment from a central OCC, enabling faster emergency response
• Commuters experienced more responsive climate control across stations and trains

Beyond the energy figures, centralized control of escalators, emergency exits, and signage improved overall system safety. The platform also positions the metro for future expansion, with FactoryTalk AssetCentre planned to support disaster recovery and asset management across the growing network.

• Native integration reduces deployment friction: Choosing a software suite with built-in compatibility with existing control hardware (CompactLogix) simplified commissioning and cut implementation risk.
• Centralized visibility is a prerequisite for optimization: Without station-level data aggregated into a single operations view, proactive energy adjustments are not operationally feasible at scale.
• Automate the common case, enable manual override: Configuring the system to respond automatically to predictable patterns (rush hour, weather trends) while preserving manual control covers both routine and unexpected scenarios.
• HVAC is the highest-leverage target: In transit environments, HVAC dominates energy spend — prioritizing its instrumentation and control yields the largest efficiency gains.