The Pragmatic Push for Pairing BESS with Solar in PJM

The PJM Interconnection is at a crossroads. As electricity demand grows and traditional generation retires, the region faces a deepening supply imbalance that threatens reliability and affordability. Meanwhile, the rapid expansion of grid-connected solar has introduced new operational challenges, chief among them the inability to dispatch energy when it’s most needed. In response, developers across PJM are turning to the pragmatic solution of coupling battery energy storage systems (BESS) with solar projects. This pairing not only helps stabilize the system but also enhances solar asset value, enabling developers to capture clipped energy, increase capacity market value, and deliver flexible, dispatchable power.

Recent analysis from The Brattle Group underscores the urgency that PJM will need roughly 43 GW of new energy storage by 2045 to maintain reliability as demand grows and fossil units retire. Capacity market prices have surged in recent auctions, reflecting the widening gap between supply and demand. Developers are feeling this firsthand as projects that once depended on predictable energy revenues are now exposed to volatile price signals and interconnection delays.

This market dynamic has made dispatchable capacity more valuable than ever. BESS offers the flexibility that PJM’s system increasingly requires, as these resources are capable of charging during low-demand periods and discharging during peak hours. As PJM continues to evolve its capacity accreditation framework, hybrid assets that integrate storage are emerging as a viable option for meeting reliability needs while capturing new sources of value.

Standalone solar remains a critical contributor to PJM’s decarbonization goals, but its limitations have become clear. Solar production peaks at midday, often exceeding transmission or inverter limits and forcing operators to curtail or “clip” excess energy. This lost generation constrains a project’s total return on investment.

Furthermore, without dispatchability, standalone solar is limited in its ability to sell into the PJM capacity market, the product PJM uses to manage system reliability.

Coupling solar with BESS unlocks new market pathways.

• Maximized Energy Capture: Storage captures excess generation that would otherwise be curtailed, converting stranded energy into usable, dispatchable capacity.

• Capacity Market Eligibility: Hybrid systems can qualify under PJM’s capacity accreditation framework with a higher accreditation than stand-alone solar, contributing firm capacity and earning stable revenue streams.

• Peak Shifting & Reliability: By discharging during high-demand or high-price hours, storage increases project value and supports grid reliability.

• Revenue Stacking: Storage enables participation in energy, ancillary services, and capacity markets, diversifying income streams.

• Grid Flexibility: Paired assets help PJM manage congestion, reduce volatility, and stabilize the grid during both scarcity and surplus conditions.

Ultimately, the addition of BESS transforms solar into a dynamic grid resource, one capable of responding to both economic and operational signals.

While the economic case for solar-plus-storage is clear, developers must navigate several layers of complexity to realize full value.

• Interconnection & Accreditation: Hybrid systems must meet evolving PJM requirements for registration, telemetry, and performance modeling.

• Control Integration: Coordinating battery dispatch with solar output requires robust communications between plant controllers, energy management systems, and PJM’s telemetry standards.

• Revenue Modeling: Developers must carefully evaluate the tradeoffs between energy arbitrage, capacity participation, and ancillary services commitments.

• Regulatory Compliance: NERC’s Inverter-Based Resource (IBR) standards and PJM telemetry rules demand precision engineering and operational discipline.

In short, the technical and regulatory bar for hybrid assets is rising, making expert guidance and operational support essential.

SYSO provides developers and asset owners with the expertise, tools, and operational support needed to bring hybrid solar-plus-storage projects online efficiently and profitably.

• Market Integration: SYSO is a PJM market participant and manages registration, telemetry configuration, and ICCP setup to ensure compliant participation in PJM’s markets for our clients’ assets.

• Real-Time Operations: Through its 24/7 Network Operations Center (NOC), SYSO monitors performance, dispatches assets, and ensures compliance with PJM’s reliability standards.

• Market Strategy & Modeling: SYSO helps developers optimize system design, evaluate market participation strategies, and forecast revenue opportunities.

• Compliance & Risk Management: SYSO ensures ongoing adherence to PJM’s evolving market rules, telemetry requirements, and accreditation standards.

By combining deep market experience with continuous operational oversight, SYSO enables developers to confidently deploy hybrid systems that meet both regulatory and financial goals. Contact our team today to learn how we help solar and storage developers navigate PJM’s complex market landscape.