The Dominican Electricity Transmission Company (ETED) confirmed that 39 concessionary companies completed the registration requirements and were enabled to move forward with the Expression of Interest to install battery energy storage systems (BESS) in the National Interconnected Electric System (SENI).
From September 8, 2026 , companies are formally invited to submit their proposals, in accordance with the Terms of Reference that will be communicated by the transmission company.
The process is part of a strategy of considerable magnitude. ETED had established as a preliminary size a portfolio of up to 600 MW / 1,200 MWh , equivalent to approximately two hours of duration, under a modular and scalable configuration.
The company has been working on the technical, financial and legal criteria necessary to enable private investment in this infrastructure and strengthen the flexibility and stability of the SENI.
The figure, however, should be read as a reference point for the program's scope . The announcement authorizing the 39 companies does not yet assign capacity to each participant nor does it represent an award of projects.
Large renewable energy generators and developers
The list also shows that it's not just new developers attracted to the storage market.
Among those authorized are AES Dominicana Renewable Energy, AES Andrés DR and Dominican Power Partners (DPP) , three companies linked to the AES ecosystem in the country.
The group also has specific experience in storage: AES Dominicana identifies AES Andrés as a pioneer in the installation of a 10 MW BESS for primary frequency regulation , while the concession for the Los Mina Energy Park of DPP includes another 10 MW storage unit.
In addition, there is a more recent project. In June 2026, the CNE modified the concession for the Bayahonda Solar Park (Bayasol) , owned by AES Dominicana Renewable Energy, which includes 50 MW of nominal photovoltaic generation and a BESS of 20.6 MW / 82.4 MWh .
Another relevant name is the Itabo Electricity Generating Company (EGE Itabo) . The company has 260 MW of installed capacity and in November 2025 commissioned a 7.5 MW BESS system, intended, among other functions, to provide auxiliary frequency regulation services. The reported investment for that installation exceeded US$8 million.
Also included is EGE Haina , one of the largest players in the Dominican electricity sector. Following the commissioning of Esperanza Renovable, the company reached 576 MW of renewable energy within a total installed capacity of 1,380 MW .
In addition, the Esperanza Solar 2 and Esperanza Eólico parks were awarded the first Dominican renewable energy tender with storage and EGE Haina plans to incorporate a 200 MWh BESS there.
Companies that already have BESS incorporated into their projects
The experience is not limited to existing large generators. Among the 39 authorized companies are developers who already have concessions for renewable energy projects combined with energy storage.
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This is the case with WCGF Solar III and WCGF Solar IV , responsible for Washington Capital Solar Park 5 and Washington Capital Solar Park 4, respectively. Each plant has a planned nominal power of 48.12 MW and a battery system of 15.12 MW / 60.48 MWh .
Together, both projects therefore contemplate 30.24 MW / 120.96 MWh of storage , although these capacities belong to their existing concessions and should not be confused with what they may eventually propose in the new ETED process.
In a similar situation is LCV Ecoener Solares Dominicana , which is developing Payita 2. The definitive concession establishes 49.98 MW nominal of solar, 60.04 MWp and a BESS of 15 MW / 60 MWh in Nagua, María Trinidad Sánchez province.
Another of the authorized companies, Maranatha Energy Investment , received in March of this year a modification for its Maranatha Photovoltaic Solar Park, with a nominal capacity of 20 MW and a potential capacity of 23.92 MWp , which incorporates a storage system of 5 MW / 20 MWh .
The registry also includes EFD Ecoener Fotovoltaica Dominicana , developer of Cumayasa I and II, which have 50 MW and 30 MW nominal capacities , respectively; in addition to other renewable energy players such as Cotoperí Solar, Renewable Energy World Dominicus, RAAS Solar, Poseidón Energía Renovable and Emerald Solar Energy.
A list that also does not equate to 39 different groups
Another peculiarity is that the 39 authorized companies do not necessarily represent 39 different business groups . The registry includes several related companies or vehicles used for specific projects.
The most obvious example is AES, with three corporate names; but WCGF Solar II, WCGF Solar III, WCGF Solar IV and WCG Energy also appear, in addition to the two companies that bear the name Ecoener.
This allows for a better understanding of the scope of the call: there is broad participation, although some of the registrations correspond to different corporate vehicles of developers who already own assets or projects in the Dominican Republic.
The list is completed with operators of diverse profiles, including Karpowership Dominican Republic, Energas, Generadora San Felipe, Coastal Petroleum Dominicana, Grupo Eólico Dominicano and Corporación Turística de Servicios Punta Cana , which shows that the interest in storage transcends exclusively photovoltaic developers.
The final capacity is yet to be determined
The central point now will be to find out what the 39 companies actually present.
At the moment, it is not known how much MW or MWh each one proposes, where the batteries would be located, how many participants will reach the final stage, or how the up to 600 MW / 1,200 MWh considered by ETED would be distributed .
Therefore, the BESS capabilities that several of these companies already have in operation or included in previous concessions serve to measure their experience in the market, but do not constitute offers within this Expression of Interest .
The next stage will reveal whether the registered interest translates into concrete projects and, above all, which players will seek to capture a share of what could become one of the largest battery storage deployments in the Caribbean.