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Global clean energy investment manager Quinbrook Infrastructure Partners has signed a  25 year power purchase agreement with NV Energy.

The deal is for the development of a 690MW AC solar photovoltaic array which will be integrated with a 380MW AC battery storage system in Clark County, Nevada.

Without the battery, the solar plant is the second biggest in the US.

The Gemini Solar+Battery system will store over 1,400MWh of energy to power customers of NV Energy in southern Nevada.

The $1 billion system will be developed over a period of 18 months and is expected to be operational by the end of 2023.

Some 2.5 million solar modules will be used to develop the system, creating over 2,500 jobs and bringing over $450 million to the local economy.

The integrated solar and energy storage plant will power over 400,000 homes and reduce carbon emissions by 1.5 million tonnes per year.

David Scaysbrook, managing partner at Quinbrook, said: "Gemini is a significant power infrastructure project that sets new benchmarks for the teaming of solar PV and battery storage at large scale in order to deliver low priced, renewable power to benefit the citizens and the economy of Nevada. Gemini has the potential to be a game-changer for the deployment of cost-effective renewable power at a time when sustainable investment to reduce emissions from power generation has never been more critical. The long-term commitment that NV Energy has made to ensure that Gemini can be built shows their commitment to harnessing the abundant and low-cost solar resource available in Nevada and matching that with the recent advancements in battery storage pricing and capability."