The Department of Energy (DOE) has issued Department Circular No. DC2026-02-0008, which requires variable renewable energy (VRE) power plants to be integrated with energy storage systems (ESS) in both development and grid integration.

According to the new circular, all VRE projects with an installed capacity of 10 megawatts (MW) and above must also install ESS equivalent to 20% of the plant’s capacity, subject to system studies and technical requirements. 

The new framework expands on and amends the current Energy Storage Systems Policy under DC2023-04-0008, which will now formalize storage integration in both grid-connected and off-grid areas as part of system planning. 

VRE plants usually refer to solar and wind projects, whose outputs aren’t constant as they are subject to external factors such as weather and time of day. This makes it so that their power cannot be dispatched on demand, like you could with traditional power plants.

ESS help solve this issue by storing electricity when generation conditions are favorable and then dispatching them when the output is low. They also address voltage and frequency stability so that the grid can absorb more power from these renewable energy sources- all while maintaining grid stability.

“Energy storage is not only about storing surplus energy, it is about strengthening the grid’s capability to absorb more renewables while maintaining reliability,” Energy Secretary Sharon S. Garin said. “This policy ensures that ESS integration becomes part of system planning and project development, supporting better outcomes for consumers.”

The DOE also encouraged ESS installations to include grid-support capabilities such as grid-forming inverters to stabilize voltage and frequency and maximize operational value. The updated framework also makes sure to note that ESS with virtual inertia or fast-acting system response may be deployed to improve quality across transmission and distribution networks.

The policy directs the transmission network provider (TNP) and distribution utilities (DUs) to consider ESS facilities in grid reinforcement strategies where storage can provide critical system services. These services include voltage stability, frequency control, and alternative supply during temporary separation from the main grid.

To institutionalize storage integration, the Circular instructs the TNP to incorporate ESS considerations in the Transmission Development Plan (TDP) and recommend guidelines for grid-support capabilities. The DOE also said periodic studies and tests will be conducted to support uniform technical requirements, taking into account international standards and the Philippine Grid Code.

The department also announced that ESS will be reflected in the next update of the Philippine Energy Plan (PEP) and considered in the review of the TDP, Distribution Development Plan (DDP), and Microgrid Energy Development Plan (MEDP), positioning it as a wide-reaching system resource.

The DOE reaffirmed that the updated framework is designed to strengthen investment signals, improve system performance, and enable the country’s clean energy targets without compromising reliability.

Will mandatory storage integration reshape how large renewable projects are financed and developed in the Philippines?

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