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Distributed energy resources (DERs) can help buildings use less electricity, shift some use to better times, generate power locally and support selected operations during an outage. They include demand-side measures such as efficiency and controllable HVAC—not just solar panels and batteries. The benefits depend on the building’s loads, equipment, utility rates, local grid and system design, so the right first step is to define the service a building needs rather than start with a particular technology.
What are distributed energy resources in a building?
DERs are smaller-scale energy resources located near the electricity use they serve. In a building, they can include energy efficiency, flexible loads, rooftop solar, batteries and coordinated systems such as microgrids. The U.S. Department of Energy’s 2024 Smart Grid System Report groups energy efficiency, demand response, power generation and storage among DER capabilities.
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This definition matters for owners, designers and construction teams: a building can have useful DER capability without generating electricity. Better controls or managed electric-vehicle charging, for example, can change when power is used. Solar produces electricity on site; a battery can store and discharge energy; a microgrid coordinates resources and may be designed to disconnect from the wider grid. These measures perform different jobs and are not interchangeable.
A useful way to think about DERs is as a set of building services: reduce total demand, shift demand over time, supply electricity locally, or maintain selected services when grid power is unavailable. A project may need one service or a combination. Establishing the need first helps prevent an expensive mismatch between the equipment installed and the problem the building is meant to solve.
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How can DERs reduce building energy costs?
DERs may reduce energy purchases, change when a building buys electricity, or create opportunities to provide services to a grid or utility program. They do not guarantee a particular bill reduction: financial value depends on the building’s load profile, tariff, equipment, incentives and program eligibility.
Efficiency reduces the amount of energy needed to provide building services. Improvements to building systems and controls can also affect peak demand, depending on how and when the equipment operates. Solar can supply some electricity on site, reducing grid purchases when production matches building use. A battery can store energy and discharge it later, which may help manage peak demand or shift purchases under certain rate structures. These are different mechanisms, and a favorable result under one tariff is not a universal outcome.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Before treating a proposed measure as a cost-saving investment, examine the bill and operating schedule. Identify which end uses drive consumption and when peaks occur; then check how the utility charges for electricity, whether exported energy is compensated, and whether an applicable incentive or demand-response program exists. A change in a building’s schedule can matter as much as the equipment choice, so compare expected operation with actual occupancy and service requirements.
A useful financial assessment separates energy-bill savings from other potential value. Possible benefits might include reduced demand charges, export revenue or program payments, but each depends on local rules and qualification. Ask the project team to state the assumptions behind each claimed benefit, including tariff, operating hours, equipment performance and incentive availability. If those assumptions change, the financial case may change too.
How do buildings shift or shed electricity use?
Demand flexibility is a building’s ability to adjust its electricity use over time. The Department of Energy describes it as a DER capability that can adjust load profiles through controlled or reduced consumption, potentially helping utilities avoid system costs; the value depends on how the resource is operated and the relevant grid arrangements. See DOE’s guide to valuing demand flexibility from grid-interactive efficient buildings.
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Some loads can be reduced temporarily; others can be moved to another time. A building control strategy could adjust heating or cooling within agreed comfort and operating limits, operate an interactive water heater at a different time, or manage EV charging rather than allow all vehicles to charge whenever they are plugged in. NREL describes demand flexibility as the ability to temporarily reduce or shift some energy use without harming occupant comfort or building services, for a given level of energy efficiency, in its report on grid-interactive efficient buildings.
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For a compatible HVAC system, a smart thermostat may be one element of a broader load-management approach. It is not, by itself, a complete DER strategy, a guarantee of lower bills or outage backup. Confirm compatibility, control boundaries and whether a relevant utility program is available before treating it as a project benefit.
Can DERs keep a building operating during a power outage?
They can support continuity for selected building functions if the system is specifically designed for the outage scenario. Having rooftop solar alone does not mean a building will remain powered when grid service fails; backup operation depends on suitable controls, islanding capability, storage or another available source, and a defined plan for which loads to serve.
Start by identifying critical loads and the services they support. The list may include only essential operations rather than every system in the building. Then establish how long those services need to continue and what energy sources will be available. A battery can deliver stored energy, but its ability to serve a load depends on its power and energy capacity, controls and available charge. A system with on-site generation may have different capabilities depending on its configuration and the conditions under which it can operate.
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A microgrid can coordinate local generation, storage and loads, and may be designed to operate in islanded mode—separately from the wider grid. That ability still depends on the system design, controls, operating plan and available energy or fuel. It is not a blanket promise that every building function will continue through every outage.
Efficiency can also contribute to resilience. The Department of Energy describes energy efficiency as supporting “passive survivability”: maintaining habitable conditions during a power outage. Efficiency is part of a broader resilience plan, however, not a substitute for backup power where a building’s critical operations require it. DOE’s overview of DERs for resilience and its guide to resilience in public buildings provide additional context.
For a construction or retrofit project, resilience design should make the outage case explicit: which loads are essential, what operation is expected, what sources can serve them, and how the system will be controlled. A resilience plan should also account for the limits of the available energy source and the possibility that an outage lasts longer or affects more infrastructure than expected. DERs can be an important part of that plan, but they do not replace it.
How can building DERs help the electricity grid?
Flexible buildings can change electricity use in response to grid needs or price signals, while on-site generation and storage can contribute resources near the point of use. Coordinated DERs can help avoid some system costs, but the benefits and any compensation depend on local markets, utility programs, regulation and grid conditions.
That potential does not mean every building is automatically providing a grid service. Participation may require compatible equipment, controls, an eligible program and an operating agreement. A building owner should check whether a utility or market program exists in the relevant jurisdiction, what actions it calls for, and whether the building can meet those requirements without disrupting its essential services.
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DER growth also creates integration considerations. If local distribution systems are not prepared for changing patterns of generation and demand, higher uptake can contribute to issues such as changed peaks or local voltage concerns. Grid readiness, coordination and suitable incentives affect how useful DERs are and what upgrades or controls may be needed. The International Energy Agency discusses both the potential and integration issues in Unlocking the Potential of Distributed Energy Resources and its executive summary.
How do you choose the right DER approach for a building?
Compare options by the service the building needs, not by the technology label. The same resource may be valuable for one objective and poorly matched to another.
| Option or capability | Primary building service | Questions to resolve |
|---|---|---|
| Energy efficiency | Reduce total energy demand and potentially peak load | Which end uses dominate? What savings and comfort effects are supported by measurements or analysis? |
| Demand response and flexible controls | Shed or shift loads in response to signals | Which loads can be controlled? What are the comfort and operating limits? Is a utility or market program available? |
| Rooftop solar PV | Generate electricity on site | What are the roof, shading, interconnection, export and load-matching conditions? |
| Battery storage | Shift energy, support peak management or serve selected loads | What power and energy capacity, duration, controls, safety provisions and tariff value are needed? |
| Microgrid | Coordinate resources and potentially operate islanded | Which critical loads must continue, and what generation, storage, controls, fuel and operating plan are required? |
The comparison questions are investigation prompts, not product rankings. Solar, storage, flexibility and efficiency can also complement one another. For example, the usefulness of a battery for a particular building depends not just on having storage, but on its intended function, the building’s load and the operating conditions. A design should make those relationships clear rather than assume that combining more technologies automatically makes a project more valuable.
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What should owners and construction teams examine before installation?
Begin with the building’s purpose and constraints. New construction can consider DER services as part of coordinated design; an existing building may have roof, equipment, controls or operational constraints that affect what can be added. In either case, use these questions to structure the assessment:
- Define the objective. Decide whether the priority is reducing energy use, managing peaks, shifting loads, supplying local electricity, supporting critical operations during outages, or some combination.
- Understand the load. Identify the building’s major end uses, their operating schedules and the times when electricity demand is highest. A resource’s usefulness depends on how its production or controllability matches the building’s needs.
- Set operating boundaries. Identify loads that cannot be interrupted, acceptable comfort ranges and operational limits. These boundaries are essential when evaluating demand response, storage dispatch and outage service.
- Check the site and grid context. For solar, examine roof and shading conditions as well as interconnection and export rules. For all options, confirm what local utility arrangements and grid constraints may affect installation or operation.
- Model the economics using applicable rules. Review tariffs, demand charges, export compensation, incentives and program eligibility rather than relying on a generic savings estimate. Separate certain bill effects from conditional revenue or program payments.
- Specify the controls and operating plan. Determine how resources will be coordinated, what signals they will respond to, and how the building will operate during normal conditions and outages. For resilience, define the critical loads and the expected service before sizing or selecting equipment.
- Revisit the assumptions. Occupancy, schedules, utility rules and rates can change. Make clear which assumptions underpin the expected benefits and how the owner will evaluate performance after installation.
This sequence is useful because DER value is tied to a building’s actual use and local electricity system, not merely to installed equipment. If the objective is resilience, specify outage service first. If the objective is cost, start with the tariff and load profile. If the objective is flexibility, identify controllable loads and acceptable operating limits. A project can then evaluate technologies against a specific need.
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What are the main limitations of DERs for buildings?
The main caveat is that no single DER benefit is automatic. Efficiency, generation, storage and flexible loads affect energy use in different ways, and their results depend on design and operation. A project should avoid promising a universal payback, bill reduction, export income or outage duration without evidence specific to the site and applicable rules.
Resilience claims require particular care. Solar panels do not necessarily power a building during an outage; backup depends on system configuration, controls, islanding capability, energy availability and the loads selected for service. A building may have to prioritize critical operations rather than serve every load.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →DERs can also interact with a distribution grid that may not be prepared for changed demand or local generation patterns. Local grid capacity, voltage conditions and demand timing can influence what is practical. Electricity markets, regulation, utility practices and incentives differ among jurisdictions, so a business case that applies in one location may not transfer to another.
These qualifications do not make DERs less useful; they clarify what must be designed, checked and operated to realize their benefits. The strongest project case ties each proposed resource to a clearly stated service, verifies local requirements, and distinguishes what the building can control from what depends on utility programs or broader grid conditions.
Frequently Asked Questions
Are distributed energy resources the same as renewable energy?
No. Renewable generation such as solar can be a DER, but DERs also include efficiency, demand response, controllable loads and storage. The term describes the location and function of resources near electricity use, not whether every resource is renewable.
Does a building need solar panels to participate in demand response?
No. A building may shift or reduce controllable electricity use without generating power. Whether that flexibility can participate in a particular program depends on the program’s rules and the building’s equipment and operating limits.
Can an existing building add DERs, or are they only for new construction?
Both new and existing buildings can evaluate DERs, although roof conditions, existing systems, controls and operating constraints shape retrofit options. The right assessment starts with the service needed and the building’s specific loads, rather than assuming a single technology will fit.
Do DERs always reduce a building’s carbon emissions?
Not necessarily. Emissions effects depend on what electricity or fuel a resource displaces and when and where it operates. Local grid conditions and operating patterns therefore matter when assessing decarbonisation benefits.
