Strategies and Benefits
In today’s built environment, energy efficiency is more than a buzzword—it’s a design imperative. With rising utility costs, evolving building codes, and increasing tenant demand for sustainable living, energy-efficient electrical design is no longer a luxury for multifamily developments—it’s a necessity.
From LED lighting and occupancy sensors to advanced energy storage systems and smart meters, modern technologies are making it easier to design multifamily buildings that reduce energy usage, cut operating costs, and offer long-term return on investment (ROI).
In this blog post, we’ll explore key strategies for integrating energy-efficient technologies into multifamily electrical design, their benefits, and how to maximize their ROI for developers, owners, and tenants.
Why Energy Efficiency Matters in Multifamily Buildings
Multifamily housing is one of the fastest-growing sectors in residential construction. Energy consumption can be significant with dozens—or even hundreds—of units in one building. According to the U.S. Energy Information Administration (EIA), residential buildings consume roughly 22% of total energy in the United States, and multifamily units play a big role in that total.
Designing with energy efficiency in mind benefits everyone:
- Owners/Developers enjoy lower operating costs and improved property value.
- Tenants benefit from lower utility bills and enhanced comfort.
- Municipalities meet climate action goals and reduce grid strain.
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LED Lighting: The Cornerstone of Energy Efficiency
Why LEDs?
LEDs (light-emitting diodes) are the most energy-efficient lighting solution available today. They use up to 75% less energy than incandescent lighting and last up to 25 times longer. In a multifamily project, where lighting is used across units, common areas, hallways, and exteriors, switching to LED offers a massive opportunity for savings.
Design Considerations
- Color temperature and CRI (Color Rendering Index): Use warmer LEDs in living spaces and higher CRI in task areas.
- Dimming capability: Many LED fixtures are dimmable, which enhances energy savings and tenant comfort.
- Integrated controls: Many LED systems now integrate occupancy sensing and daylight harvesting (more on that next).
ROI
LED lighting typically delivers a return on investment in 2–5 years, depending on usage patterns and local energy rates. When paired with controls, payback can be even faster.
Pro Tip: Specify ENERGY STAR® certified LED fixtures to qualify for utility rebates and ensure long-term performance.
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Occupancy and Vacancy Sensors
What They Are
Occupancy sensors automatically turn lights on when someone enters a room and off when the space is vacant. Vacancy sensors require manual activation but will turn the lights off when the room is empty. Both reduce unnecessary energy use, especially in transient spaces like laundry rooms, storage areas, fitness centers, and restrooms.
Where to Use Them
- Common Areas: Hallways, lounges, conference rooms, mailrooms. Some jurisdictions require corridors and stairwells to dim to 50% when not occupied and then return to full brightness when someone is detected in the space. Verify the requirements with the local jurisdiction.
- Parking Garages and Surface Parking: Combined with LED fixtures, sensors can dramatically reduce lighting energy consumption. As with corridors and stairwells, utilize a step-dimming fixture for parking garages and surface parking areas to dim fixtures 50-75% when not occupied, returning to full brightness when a car or pedestrian is sensed.
- Mechanical/Electrical Rooms & Utility Spaces: Often forgotten, these are prime locations for sensors. Consider a vacancy sensor in these spaces for manual activation.
ROI
Depending on the area, occupancy sensors can reduce lighting energy consumption by 30–60%. With lower installation costs than major system upgrades, they often pay for themselves in under 2 years.
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Daylight Harvesting and Photo Sensors
What They Do
Daylight harvesting systems use sensors to measure ambient natural light and adjust artificial lighting accordingly. Photo sensors can completely turn off lights when daylight is sufficient, particularly in corridors, lobbies, and stairwells with windows or skylights.
Integration with Lighting Systems
Modern lighting control panels often support daylight integration. Smart lighting solutions can automatically adjust light output to maintain consistent illumination levels and optimize energy use.
ROI
Savings depend on the available daylight level, but 20–40% energy savings are achievable in areas with significant natural light.
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Energy-Efficient Appliances and Smart Plugs
While primarily within the tenant’s domain, specifying energy-efficient appliances in units—such as ENERGY STAR® refrigerators, dishwashers, and laundry machines—helps reduce the building’s overall energy profile.
Smart Plugs and Load Controls
Installing smart plugs in common areas or tenant units allows residents or building managers to control plug loads (TVs, electronics, coffee machines) remotely or on schedules. This helps reduce phantom loads and overall energy use. Once again, the latest versions of energy codes may require controllable receptacles in offices, conference rooms, and other areas. Verify with your local codes.
Pro Tip: Smart plug integration can significantly reduce communal energy waste in master-metered buildings.
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Submetering and Smart Meters
The Power of Visibility
Submetering allows for individual energy usage tracking per unit or space. This incentivizes residents to manage their energy consumption and provides property managers with detailed analytics to identify inefficiencies.
Smart Meter Benefits
Smart meters go further by providing real-time data, enabling dynamic pricing strategies, peak load awareness, and integration with demand response programs. As a minimum, consider the use of meter-ready distribution panels. You can separate loads into lighting, mechanical equipment, and everything else, or utilize a segregation panel that separates the loads within one panel.
ROI
Submetering often pays for itself within 1–3 years through reduced consumption and increased tenant accountability. In some markets, it’s required by code or incentivized by utilities.
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Energy Storage Systems and Battery Backup
Why Use Energy Storage?
Battery systems store excess energy—either from the grid during off-peak hours or from onsite solar installations—and discharge it during peak demand times. This reduces demand charges, increases resiliency, and can serve as backup power during outages.
Use Cases in Multifamily
- Pair with Solar: Store daytime solar production for evening usage.
- Backup for Common Areas: Maintain lighting, elevators, or security systems during blackouts. Verify any battery systems used for emergency or legally required standby systems are UL 924 (Emergency Lighting and Power Equipment) and UL 1008 (Transfer Switch Equipment) compliant.
- Peak Shaving: Reduce costs in areas with high demand charges.
ROI
Energy storage ROI varies based on location, utility rates, and whether paired with renewables. Incentives like the Investment Tax Credit (ITC) for solar-plus-storage installations can improve payback significantly, especially in California and New York.
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Onsite Renewable Energy (Solar PV)
Solar for Multifamily
Solar photovoltaic (PV) systems are increasingly common in multifamily projects, both for offsetting common area energy usage and, in some configurations, supplementing tenant loads. At a minimum, the service equipment should be designed with a future PV circuit breaker to allow system installation after construction.
Design Tips
- Roof Planning: Ensure adequate clear space, proper orientation, and minimal shading. Provide grouping for mechanical and other rooftop equipment to maximize available roof space. Ensure the structural engineer is aware of the system to design the proper roof load for a PV system.
- Code Compliance: Comply with NEC Article 690 and any local solar mandates (like California’s Title 24).
- Energy Storage Integration: Improve system value with battery pairing.
ROI
Solar payback depends on system size, incentives, and local rates but typically ranges from 6–10 years. With incentives like the federal ITC and utility net metering, many developers see long-term value and increased marketability.
Bonus: Utility Rebates and Incentives
Don’t leave money on the table. Many local utilities offer rebates for installing energy-efficient technologies, including:
- LED lighting retrofits
- HVAC upgrades
- Controls and sensors
- Energy-efficient appliances
- Solar and battery systems
Check local programs through DSIRE (Database of State Incentives for Renewables & Efficiency) or your utility’s website.
Conclusion: A Smarter Way to Build
Energy efficiency in multifamily electrical design isn’t just about checking boxes for code compliance—it’s a strategic advantage. From LED lighting and smart controls to solar power and energy storage, the right design choices reduce costs, enhance tenant satisfaction, and support long-term building performance.
When integrated thoughtfully, these systems provide excellent ROI and ensure the building remains competitive in an increasingly energy-conscious market. For developers, owners, and engineers alike, building smart today means fewer headaches—and more value—tomorrow.
Need help designing an energy-efficient electrical system for your next multifamily project? Reach out to our team of experienced engineers to create a custom strategy that delivers long-term performance and savings.
¡Viva la Revolutión!