Project Background

A nursing home in Thessaloniki, Greece operates an existing on-site solar system to meet its daily power needs. Strict local Zero Feed-in policies prohibit any excess PV power from being exported to the grid. The core goal was to maximize solar self-consumption without rebuilding the existing system, while ensuring compliance and stable power supply for critical equipment.

Client Demands

Strictly comply with Greece’s Zero Feed-in regulations to avoid penalties and ensure grid compliance.Integrate legacy third-party inverters and meters to eliminate energy waste and unlock stranded solar assets.Manage volatile loads of the nursing home in real time to maintain stable power supply for medical equipment.Optimize the existing system via retrofitting instead of hardware replacement to control CapEx.

CESC Solution

  • Flagship ESS Deployment: Implemented the Mercury 233 EU all-in-one energy storage system (105kW/233kWh) with a software-led optimization strategy.
  • Brownfield EMS Integration: Customized EMS protocol mapping to seamlessly connect existing third-party equipment, avoiding inverter replacement and rewiring to cut CapEx.
  • Precision Phase Control: Adopted single-phase PCS control to dynamically balance volatile loads, achieving 100% Zero Feed-in compliance without self-consumption loss.
  • Localized Grid Adaptation: Provided end-to-end localized engineering, from protocol debugging to on-site commissioning, fully tailored to Greece’s grid specifications.

Key achievements

  • Full Zero Feed-in Compliance: Realized stable and precise export limitation, meeting Greece’s strict regulatory requirements with no violations.
  • Stranded Asset Activation: Eliminated solar curtailment, maximizing on-site self-consumption and unlocking the full ROI of existing solar assets.
  • CapEx & OPEX Savings: Retrofitting solution saved hardware replacement costs, while optimized energy usage reduced grid power dependency and operating expenses.
  • Enhanced Power Reliability: Laid the foundation for critical medical equipment stability, upgrading energy optimization to life safety assurance.

Solution Expansion & Upgrade Applications

  • Life Safety Upgrade: Phase II will integrate STS (Static Transfer Switch) technology to ensure uninterrupted power for critical medical equipment during grid disturbances.
  • Retrofit Scalability: The software-customized approach is highly adaptable for C&I facilities with legacy solar systems, supporting cost-effective retrofits.
  • Pan-European Policy Adaptability: Serves as a replicable model for markets with Zero Feed-in or self-consumption-only policies, turning regulatory constraints into competitive edges.
  • Healthcare-Specific Application: Ideal for nursing homes and hospitals requiring stable power supply for critical equipment, combining energy efficiency with life safety.