How can I use smart energy management integration with behind-the-meter storage to cut peak demand at a facility?

You can cut peak demand by using smart energy management (EMS) to control a behind-the-meter battery storage system so it discharges during your facility’s highest-demand periods, reducing the kW drawn from the utility at those times.

Core idea

• Behind-the-meter storage is a battery installed on your side of the meter.
• A smart EMS monitors:
  • facility load,
  • utility rates and demand charges,
  • weather/production schedules,
  • battery state of charge,
  • on-site generation if you have it.
• The EMS then decides when to charge and when to discharge to:
  • shave peaks,
  • avoid demand charges,
  • shift energy use to cheaper hours,
  • maintain backup reserves if needed.

How it works in practice

1. Measure the load in real time

   • Use meters and submetering to identify when the facility’s demand spikes.
   • Determine which loads create peaks: HVAC, compressors, chillers, process equipment, EV charging, etc.

2. Set a peak demand target

   • Choose a demand cap, such as “keep monthly peak below 800 kW.”
   • The EMS uses this as a control threshold.

3. Program battery discharge during peak events

   • When site load approaches the target, the battery injects power to offset the grid draw.
   • Example: if the facility is at 1,000 kW and the target is 800 kW, the battery supplies 200 kW.

4. Charge the battery off-peak

   • Charge overnight or during low-demand periods.
   • If you have solar, charge from excess solar output when possible.

5. Coordinate with other flexible loads

   • The EMS can also reduce or shift noncritical loads:
     • precool/preheat,
     • delay process loads,
     • stagger motor starts,
     • control EV charging.
   • Storage works best when combined with load management.

6. Use forecasting and automation

   • Advanced systems predict peaks using:
     • historical load patterns,
     • weather forecasts,
     • production schedules,
     • tariff rules.
   • The EMS can act proactively before the peak occurs.

Common control strategies

• Peak shaving: Battery discharges only when demand exceeds a set threshold.
• Demand limiting: EMS enforces a hard cap on utility import.
• Time-of-use arbitrage: Charge when power is cheap, discharge when expensive.
• Solar self-consumption: Store excess solar and use it later to reduce grid imports.
• Backup reserve mode: Keep some state of charge for outages while still shaving peaks.

Key steps to implement

• Audit your load profile and identify peak drivers.
• Review your tariff, especially demand charges and time-based pricing.
• Size the battery based on:
  • peak kW reduction needed,
  • peak duration,
  • desired backup reserve.
• Integrate EMS with facility controls:
  • BMS/SCADA,
  • building automation,
  • meters,
  • battery inverter/controller.
• Test and tune the dispatch logic over several billing cycles.

Example

If your facility has:

• average load: 500 kW,
• peak load: 900 kW,
• demand charge based on monthly max kW,

and you install a 300 kW / 600 kWh battery with EMS control, the EMS can discharge 200–300 kW during the peak window, cutting grid demand to around 600–700 kW and significantly reducing demand charges.

Practical considerations

• Battery size matters: You need enough kW for peak reduction and enough kWh for duration.
• Demand charges may reset monthly: One short peak can drive the whole bill.
• Battery degradation: Frequent cycling affects life, so optimize dispatch.
• Interconnection and safety: Coordinate with utility and comply with electrical/fire codes.
• Operational constraints: Avoid impacting critical processes or backup power needs.

If you want, I can also help you with:

• a sample EMS control logic for peak shaving,
• battery sizing calculations,
• or a facility-specific example using your load profile and utility tariff.