The national laboratory defined hybrid plants as those combining two or more resource types, whether multiple types of generation or generation and storage, using a single point of interconnection. They don’t necessarily need to feature coordinated operations of the hybrid/co-located resources, i.e. the storage charging from the solar.

Solar PV plus storage is the most popular type of hybrid project, LBNL said, show the distribution between different combinations below.

The organisation added that by GW capacity, PV-co-located and standalone storage capacity are roughly at par, around 4GW, while PV-co-located projects are larger by GWh capacity – 12.5GWh versus 10.4GWh.

It also said that its research showed that storage assets co-located with PV are mainly providing capacity firming services and energy arbitrage while those co-located with wind resources are primarily targeting the ancillary service markets.

LBNL added that it the figures in its analysis do not include the impact of the Inflation Reduction Act’s investment tax credit (ITC) for standalone energy storage, but it expected a continuing trend towards co-located projects for other reasons.

Major US co-located projects Energy-Storage.news has reported on in the last few weeks include an offshore wind proposal containing a 253MW storage option in New Jersey, a solar-plus-storage project acquisition with a 50MW battery in New Mexico, and the start of construction on another in the state with 100MW of energy storage.

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