In Pava'ia'i, a large solar farm is integrating with the grid, while EVLO batteries aim to stabilize Tutuila's electricity supply.

In the South Pacific, thousands of kilometers from the major continental energy systems, producing electricity means dealing every day with a structural problem: dependence on imported fuels. Samoa Americane, the new photovoltaic system of Pava'ia'i, on the island of Tutuila, tries to change this balance by bringing to the grid an expected capacity of 20 megawatts and combining it with battery storage systems.

The project reached a decisive stage in 2026. On June 2, after a site visit conducted by the top management of theAmerican Samoa Power Authority (ASPA) together with the contractor Eastern Power Solutions (EPS), the local utility reported that most of the installations had been completed and that the work had entered the integration with the electricity grid, while testing of the batteries supplied by EVLO was underway.

It's not just about adding photovoltaic panels to the energy mix. A large amount of solar energy fed into a relatively small island grid must be managed without compromising the frequency, continuity, and quality of supply. This is where the electrochemical storageStoring part of the available energy and controlling variations in photovoltaic production can make the entire system more stable.

The project was presented in April 2024 as an investment of approximately 50 million dollars by Eastern Power Solutions, with the stated goal of reducing the region's dependence on fuels and helping lower electricity costs. Two years later, Pava'ia'i has moved from the construction phase to the stage where panels, batteries, and the grid will begin to function as a single system.

Three sites transform photovoltaics into programmable energy

The storage component does not involve a single battery installed next to the power plant. EVLO Energy Storage, a company controlled by Hydro-Québec, indicates three systems for American Samoa EVLO 1000 for a total power of 10 MW and an energy capacity of 20 MWh, corresponding to a nominal duration of two hours. The projects are distributed between Tutuila and Aunu'u.

The first system, from 4 MW and 8 MWh, was commissioned in April 2025. The other two are sized at 5 MW/10 MWh and 1 MW/2 MWh respectively. Their main function is not simply to store electricity for use after sunset: EVLO identifies applications as ramp rate control, that is, controlling the speed at which photovoltaic production increases or decreases.

This is an important technical detail. A photovoltaic field's output can fluctuate rapidly when weather conditions alter irradiance. In a large interconnected grid, these fluctuations are absorbed by many power plants, lines, and distributed resources; in an island electricity system, however, a significant variation can have a proportionally greater impact.

Batteries can intervene for smooth out the fluctuations, absorbing energy when production increases rapidly and releasing it when it decreases. The expected result is a greater capacity for photovoltaic integration without sacrificing grid stability. EVLO presents the three systems as tools for solar integration and power fluctuation management.

American Samoa's energy transition thus also becomes a grid engineering challenge. Installing renewable capacity is only the first step; it's then necessary to ensure that intermittent electricity can coexist with demand, conventional generation, and the technical constraints of an isolated system.

The price of diesel fuel shows the vulnerability of the islands

The economic context explains why the project has taken on particular importance in 2026. Last March, ASPA urged customers to limit consumption following the increase in diesel prices, warning that the fuel price hike would impact bills in April and May. At that same time, the utility highlighted the commissioning of the new solar plant as one of the tools designed to reduce exposure to fuel costs.

For a remote area, the issue is broader than international oil prices. Fuels must be purchased, transported by sea, stored, and distributed locally. Any changes in prices or logistics can therefore affect the cost of electricity generation.

According to US Energy Information Administration,

American Samoa relies on imported fossil fuels for much of its energy needs. In 2024, solar PV accounted for about 13 percent of its electricity generation capacity, but only about 3 percent of its actual electricity generation.

The EIA itself identifies the new 20 MW project on Tutuila as one of the interventions destined to significantly increase the solar capacity of the area.

It's this disproportion that makes Pava'ia'i particularly interesting. Twenty megawatts represents a significant capacity compared to the size of the local electricity system. Integration therefore cannot be treated as the marginal addition of a small distributed source: it requires control, storage, and coordination with existing generation.

Pava'ia'i is built on three plots covering over 46 acres.

The project is also physically distributed. In 2024 ASPA had explained that the plant would be built on three plots, for a total surface area greater than 46 acri, leased from three different owners. The sites were named Mana 1, Mana 2, and Banana Solar.

Eastern Power Solutions identifies today among its projects in American Samoa the Banana Solar Farm, with 6 MW of capacity and completion indicated in 2024, and the Mana Solar Farm, 13 MW, due for completion in 2025. The company describes both as utility-scale PV installations.

However, the data for the individual components should not be automatically confused with the overall capacity communicated by ASPA for the Pava'ia'i project. It is the local utility that indicates 20 MW as expected power of the solar farm in the integration phase of June 2026.

This structure, however, demonstrates that the project is not limited to a single rectangle of panels. It's a distributed infrastructure that must be connected to the grid and coordinated with storage systems installed at multiple points.

Complexity increases when renewable generation reaches a high percentage of demand. Therefore, the project's true outcome will not be measured solely by the nominal installed capacity, but by the amount of solar energy actually absorbed by the grid and its ability to reduce the use of imported fuel generation.

Ta'ū had already shown that an island can live on the sun

American Samoa already has a particularly significant precedent. In 2016 ASPA completed on the island of Ta'ū, in the Manu'a archipelago, the conversion from diesel generation to a hybrid photovoltaic and battery system.

According to the EIA, the facility includes a solar power plant 1,4 MW with over 5.000 panels, combined with a storage system that allows electricity to be supplied even at night. The microgrid is capable of meeting 100 percent of the island's electricity needs and has replaced the consumption of over 100.000 gallons of diesel per year.

Pava'ia'i, however, operates on a different scale and in a different context. Tutuila It is the main island of American Samoa, with the majority of the population and home to Pago Pago and much of the territory's economic and administrative activity. Bringing a much larger share of solar to its grid means addressing more complex integration issues than those of a small, isolated microgrid.

The Ta'ū experience remains important, however, because it demonstrates that on remote islands the combination of photovoltaics and storage can have a function that goes beyond reducing emissions: it can concretely reduce the amount of fuel that needs to be transported across the ocean.

The same principle is now being transferred to Tutuila, but with a larger architecture, multiple production sites, and BESS systems called upon to actively intervene in regulating production.

The goal remains 100 percent renewables by 2040

The transformation does not arise exclusively from Pava'ia'i's project. In 2016 theAmerican Samoa Renewable Energy Committee had set the goal of reaching the 100 percent of energy from renewable sources by 2040, with a central role assigned to solar. EVLO explicitly recalls this approach when presenting the systems installed for ASPA.

The gap between the goal and the current situation remains considerable. EIA data show that diesel continues to dominate the region's electricity generation. New photovoltaic systems may change the mix, but they don't automatically eliminate the need for programmable capacity, reserves, and infrastructure capable of keeping the system operational when the sun isn't available.

This is where batteries take on a central role. 20 MWh total The energy reserves declared by EVLO do not provide sufficient reserves to power Tutuila indefinitely: the systems' nominal runtime is two hours. Their primary task is much more dynamic, as they must help the grid absorb a growing share of variable energy and manage production fluctuations.

American Samoa's transition, therefore, is not simply a matter of replacing a diesel power plant with a photovoltaic field. It requires a new architecture in which solar generation, batteries, control systems and conventional production work together while the renewable share progressively increases.

The test will be how much fossil energy will be avoided

By June 2026, most of the Pava'ia'i installation was complete, but the most important phase was still integration and testing. It is therefore prudent to distinguish between expected power, installed infrastructure and performance actually achieved by the network.

The numbers that will matter in the coming months will be the operational ones: how much electricity the photovoltaic system will actually produce, how much can be absorbed without limitations, how often the batteries will intervene and, above all, how much diesel will be avoided.

The impact on utility bills will also need to be assessed over time. Reducing fuel consumption can reduce exposure to international oil price fluctuations, but the final cost of electricity also depends on investments, power purchase agreements, maintenance, grid infrastructure, and other system costs.

For a small Pacific territory, however, Pava'ia'i represents an experiment of particular interest: it demonstrates how the island energy security can be addressed by combining a locally available resource, the sun, with storage and control technologies capable of making it compatible with a real grid.

If the integration manages to maintain stability and reliability while decreasing the reliance on diesel, the result will have significance beyond American Samoa. Many islands share the same problem: abundant renewable resources, relatively small grids, and a costly dependence on seaborne fuel. In Pava'ia'i, the decisive step will not be to install twenty megawatts of panels, but to demonstrate how much sun can actually replace fuel without compromising the grid.

Here are three insights that might interest you:

In Anegada, solar power reduces diesel's contribution to the microgrid.
Saba, a sustainable Caribbean laboratory for energy and community
Fiji, a Leader in Solar Microgrids for a Sustainable Future