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Source: Institute for Energy Economics and Financial Analysis

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The utility’s latest integrated resource plan calls for 1,800 megawatts of solar and 920 megawatts of storage in its first five years.

The Puerto Rico Electric Power Authority (PREPA) filed the latest edition of its 2019-2038 integrated resource plan late Friday. The report, prepared by Siemens, is a rework of a plan submitted in February, which Puerto Rico’s energy bureau deemed noncompliant with regulations.

Though the most recent integrated resource plan (IRP) bears similarities to the previous version, the latest edition calls for higher deployment of solar and storage — which already rivaled some of the most ambitious plans for the mainland — and more flexibility associated with the natural-gas infrastructure it recommends.

In the plan’s first five years, the proposed IRP states that the island should add 1,800 megawatts of solar PV and 920 megawatts of energy storage, with combined request for proposals for these technologies. Those build-outs are more ambitious than what PREPA sought in its previous plan, which called for up to 1,200 megawatts of solar and up to 900 megawatts of energy storage.

Unlike a traditional IRP, PREPA has also agreed to consider several metrics such as resilience and a central role for renewables. Since PREPA’S first plan was rejected, Puerto Rico also passed a renewable portfolio standard (RPS) of 100 percent renewables by 2050, with interim targets in 2025 and 2040.

In its rejection of the February plan, the island’s energy bureau, which regulates PREPA, laid out a litany of criticisms on the document’s modeling, its consideration of costs and the lack of reasoning behind the selection for eight “minigrids.” Though PREPA’s latest preferred plan comes in at a lower price tag, $14.4 billion rather than $15.2 billion, it’s unclear whether it meets the changes the bureau requested.

More: Puerto Rico’s latest IRP increases solar and storage targets

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