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In 2025, Tahiti crossed a symbolic threshold: for the first time, more than half of its electricity came from renewable sources: 33% from hydropower and 18% from solar. A milestone driven by Électricité de Tahiti and its subsidiary Marama Nui, and one that demonstrates that an ambitious energy transition is achievable even within the tight constraints of an isolated island grid.
But hitting 50% is only the beginning of the challenge.
Why island grids make renewable integration harder
On a continental grid, variability can be absorbed across vast interconnected networks. On an island, there is no such buffer. Every fluctuation in solar generation must be managed locally, in real time, with limited fallback options.
As solar capacity grows, so does the volatility it introduces. Clouds pass. Demand shifts. Thermal backup is costly and slow to ramp. In this context, the ability to anticipate solar production (not just measure it) becomes a critical operational lever.
Accurate solar forecasting allows grid operators to optimize dispatch across energy sources, reduce dependence on thermal generation, and maintain stability as renewable penetration increases. Without it, each percentage point gained in the energy mix comes with a higher balancing cost and greater grid risk.
Steadysun’s role in Tahiti’s energy transition
This is where Steadysun contributes. By providing high-resolution solar production forecasts tailored to Tahiti’s specific climate and grid architecture, Steadysun helps Électricité de Tahiti and Marama Nui anticipate fluctuations before they happen, enabling smoother integration of solar energy into daily operations.
Surpassing 50% renewable energy is a genuine milestone, and one we’re proud to have supported. But it’s also a starting point. The path toward deeper decarbonization of island grids will require ever more precise forecasting, tighter grid intelligence, and a continued commitment to making renewable energy not just abundant, but reliably manageable.
➡️ Source article: For the first time, Tahiti exceeds 50% renewable energy — TNTV News
