Grid-Integrated Buildings Accelerate Under New Interoperability Push Across US and EU

The global market for grid-interactive building (GIB) solutions-spanning building automation systems, distributed energy resources, and smart grid platforms-is estimated at USD 16.13 billion in 2025 and is forecast to reach USD 74.31 billion by 2035, a compound annual growth rate of 16.5%. Behind that trajectory lies a coordinated regulatory and standards push on both sides of the Atlantic: open APIs, common data models, and secure control layers are fast becoming preconditions for connecting commercial buildings to utility demand-response and decarbonization programs.

For electrical engineers, facility managers, and system integrators, this is no longer a future-state discussion. Procurement decisions made today will determine whether buildings can participate in utility flexibility markets, comply with incoming cybersecurity mandates, and serve as dispatchable assets on an increasingly stressed grid.

From Passive Consumer to Active Grid Node

The defining characteristic of a grid-interactive building is bidirectional engagement with the electricity network. GIBs automatically adjust energy use based on grid conditions, using technologies such as building automation systems, IoT sensors, renewable energy, battery storage, and energy management platforms to optimize consumption, improve efficiency, and support grid stability.

Large industrial and commercial buildings were the first to adopt smart technologies and connected systems-driven by sizable electrical loads that made them valuable for demand-response programs. A new generation of GIBs is now transforming energy management and delivering greater flexibility, actively balancing supply and demand, reducing grid strain, and lowering energy costs for building operators.^{1Navigating the EU Cyber Resilience Act: What Smart Equipment Manufacturers Need to Know | Cumulocity}

The key shift is architectural. Buildings should no longer be viewed as passive energy consumers-they can become active participants in the energy system: flexible, responsive, and capable of interacting directly with the grid. Achieving that requires more than smart devices; it demands interoperable control layers that allow building management systems (BMS), energy management systems (EMS), and utility demand-response platforms to exchange data in real time using agreed-upon standards.

The Interoperability Bottleneck-and the Standards Addressing It

Interoperability remains one of the sector's most persistent bottlenecks. Buildings rely on hundreds of devices, systems, and providers, many of which still cannot "speak the same language." Without common standards, harmonized communication, and clearer data-exchange frameworks, scaling these solutions across Europe and North America becomes significantly harder.

In North America, the key standards driving convergence include:

• OpenADR 2.0b / 3.0 - Automated demand response uses fully automated signaling from a utility, ISO/RTO, or other appropriate entity to connect to customer end-use control systems. OpenADR provides a foundation for interoperable information exchange that facilitates automated demand response.
• ASHRAE Standard 135 (BACnet) - BACnet additions will likely take the form of new objects designed to leverage smart grid technologies such as OpenADR-an advanced form of demand-response control that allows BAS to automatically decide how to shed load based on specific demand and pricing structures.
• ASHRAE Standard 201 / Facility Smart Grid Information Model - Proposed as the smart grid interoperability standard, this model defines a working standard for building control systems to exchange information with utilities and energy-consuming devices within facilities.
• CTA-2045 (EcoPort) - The CTA-2045 specification enables smart appliances and devices to connect directly to building energy management systems (commercial and residential) through a universal port.^{2Cyber Resilience Act | Shaping Europe’s digital future}

In the EU, the push aligns with Horizon Europe's smart grid-ready buildings program, which requires projects to leverage operational end-to-end architectures, digital platforms, and data-exchange infrastructure for communication between inverters, appliances, and electricity networks.^{3Building Technologies Office | Department of Energy} The EU-funded EVELIXIA project exemplifies this approach: it envisions Buildings as Active Utility Nodes (BAUNs), rendering the EU building stock energy efficient, connected through two-way communication between the grid and occupants, smart through analytics from sensors and controls, and flexible by reducing, shifting, or modulating energy use according to occupant needs while considering utility signals.^{4An introduction to Automated Demand Response and the OpenADR Standard}

The EU Cyber Resilience Act: A New Compliance Layer for Building IoT

Interoperability ambitions are inseparable from cybersecurity obligations, and the EU is raising the bar materially. The EU Cyber Resilience Act (CRA) marks a decisive shift in how IoT products are designed, maintained, and trusted. Security is no longer an optional feature or a post-market fix-it is becoming a condition for placing products on the EU market.

The CRA was formally adopted as Regulation (EU) 2024/2847, entered into force on December 10, 2024, and will be fully applicable on December 11, 2027. On November 28, 2025, the European Commission adopted an implementing regulation clarifying which products with digital elements (PDEs)-including IoT devices, hardware components, and certain software-fall within "important" and "critical" risk categories subject to more stringent conformity assessment requirements.

For the building controls sector, the implications are substantial. Many IoT devices operate in long-lifecycle environments such as energy infrastructure, where security updates and monitoring have traditionally been limited. The CRA compels manufacturers to embed security by design, monitor for vulnerabilities throughout the product lifecycle, and ensure products can be updated securely.

With penalties of up to €15 million or 2.5% of global turnover for infringements, the stakes are high for manufacturers and service providers. For procurement teams specifying building IoT and energy-control devices for EU deployments, supplier transparency-including Software Bills of Materials (SBOMs) and documented vulnerability disclosure policies-is becoming a non-negotiable specification requirement.

Policy Signals and Utility Collaboration: The US Picture

On the US side, federal investment is reinforcing the GIB agenda. The DOE's Grid Resilience and Innovation Partnerships (GRIP) program has channeled significant capital into modernizing grid infrastructure: in March 2026, the DOE announced nearly $2 billion in federal investment through the SPARK funding opportunity, aimed at addressing the nation's energy emergency by accelerating American energy development and prioritizing power system infrastructure with rapid development timelines. Separately, the DOE has committed $4.2 billion in federal investments to protect the US power grid against extreme weather threats, lower electricity costs, and increase grid capacity to meet load growth from manufacturing, data centers, and AI.

Utility-building collaborations are gaining momentum in parallel. Demand-response programs now incentivize large commercial energy consumers to reduce usage during peak periods, with utilities including Southern Company and Sacramento Municipal Utility District (SMUD) conducting pilots that aggregate distributed energy resources to improve demand flexibility. The challenge remains integration: barriers include a lack of interoperability standards for commercial building energy management and information systems to communicate with the grid, and siloed organizational structures that discourage coordination between energy efficiency and grid flexibility departments.

Previously covered on Electronics Insider: the Federal GEB Pilots program and the expansion to additional agencies provide detailed implementation context for US-based facility managers navigating procurement and cybersecurity standards.

What This Means for Procurement and Supplier Ecosystems

Building owners, utilities, and technology providers are adopting GIB solutions to modernize energy operations and position buildings as responsive nodes in the energy ecosystem. This shift creates opportunities for interoperable platforms, new partnerships, and innovative business models that accelerate smart grid integration.

For specifiers and procurement officers, the convergence of US and EU requirements translates into a clearer-if more demanding-set of criteria for supplier selection:

• Open protocol compliance: BACnet, OpenADR, and ASHRAE 201 alignment are baseline expectations for commercial BAS/EMS procurement in North American grid-response programs.
• CRA conformity (EU market): From December 2027, building IoT and energy-control devices sold into the EU must demonstrate conformity with the CRA's cybersecurity essential requirements. Procurement specifications should already reflect this.
• API openness and data portability: Real-time energy analytics and demand-response integrations require standardized, vendor-neutral APIs. Proprietary data lock-in poses both operational and compliance risk.
• Supply chain transparency: In a connected environment, a cybersecurity incident in one product can affect an entire organization or supply chain, often propagating across internal market borders within minutes. SBOM requirements and coordinated vulnerability disclosure policies are becoming contractual standards.

Key Interoperability Standards at a Glance

CRA Procurement Checklist for Building IoT & Energy-Control Devices

Important - EU Market Deployments

• Confirm the device's CRA classification (Default, Important, or Critical category)
• Require a Software Bill of Materials (SBOM) from all suppliers
• Verify the manufacturer has a coordinated vulnerability disclosure (CVD) policy in place
• Ensure the product supports secure firmware/OTA updates throughout its operational lifecycle
• Check for CE marking with CRA conformity declaration (required from December 2027)
• Demand documented secure-by-default configurations and encrypted communications across all interfaces

Outlook

GIBs are moving beyond pilot projects to become a core element of modern energy infrastructure. Organizations that combine smart building technologies, distributed energy resources, and customer-focused solutions stand to unlock gains in efficiency, grid resilience, and decarbonization. Investing in interoperable platforms and strengthening collaboration across the energy and building ecosystem can turn buildings into active partners in a smarter, more flexible grid.

The convergence of US open data-sharing mandates, EU Cyber Resilience Act requirements, and a shared emphasis on standards-based interfaces means the specification landscape for building energy systems is hardening rapidly. For engineers and facility managers, the question is no longer whether to design for grid interoperability-it is how quickly existing infrastructure can be brought into alignment.

Frequently Asked Questions

What is a grid-interactive building (GIB)? A GIB-also referred to as a grid-interactive efficient building (GEB)-is a commercial or industrial building equipped with automated controls, IoT sensors, and energy management systems that enable it to dynamically adjust energy consumption in response to real-time grid signals, pricing events, or utility demand-response programs. Unlike a passive smart building, a GIB actively contributes to grid stability through load shifting, peak shaving, and dispatchable demand flexibility.

What is OpenADR and why does it matter for BMS integration? Open Automated Demand Response (OpenADR) is a standardized communication protocol that enables utilities, ISOs, and grid operators to send automated demand-response signals directly to building automation systems and energy management platforms. Version 2.0b is the current deployment standard; OpenADR 3.0 extends the framework to support distributed energy resource management and broader grid service use cases. BACnet integration with OpenADR allows BAS controllers to act autonomously on grid signals without manual intervention.

When does the EU Cyber Resilience Act apply to building IoT devices? The CRA entered into force on December 10, 2024. Most requirements become fully applicable on December 11, 2027. Building IoT devices-including energy meters, smart controllers, BMS gateways, and HVAC control units-are in scope as "products with digital elements." Manufacturers and importers placing these products on the EU market must meet the CRA's essential cybersecurity requirements and conduct conformity assessments according to the device's risk classification.

What are the main interoperability challenges for large-scale GIB deployment? The primary barriers are fragmented protocol ecosystems (proprietary BAS controllers that do not natively support OpenADR or BACnet/IP), the absence of standardized common data models across multi-site portfolios, legacy infrastructure without API access, and organizational silos between energy efficiency and demand-response departments. On the EU side, uneven implementation of flexibility frameworks across member states adds regulatory complexity for multi-country operators.

How does demand-response integration affect building energy resilience? Demand-response integration improves energy resilience in two ways. First, it enables buildings to reduce grid dependency during peak stress events by drawing on on-site storage or pre-cooling strategies. Second, it creates a bidirectional value exchange with utilities: buildings that participate in DR programs can access financial incentives while contributing capacity that defers infrastructure investment. Buildings with integrated BMS-to-grid communication are better positioned to maintain operations during grid disruptions, particularly when combined with on-site distributed energy resources.