Nevada utility NV Energy and Google are plotting a major solar-plus-storage facility outside of Las Vegas in a deal being billed as the largest battery-backed solar corporate agreement in the world.

A large tranche of utility-scale solar – and storage – projects in Hawaii has been approved by the state’s Public Utilities Commission (PUC), each quoting a cost per kilowatt hour of US$0.10 or under.

NextEra Resources will build a 100MW solar farm for Arkansas utility Entergy Arkansas, to include 30MW of battery energy storage, as Entergy seeks to build out solar capacity in the state.

Following a report on Friday that Hawaiian Electric has contracted PPAs with 75MW of solar projects including battery storage with developer Clearway, the utility has put before regulators proposals for five other grid-scale projects.

While a recent study said 10GW of energy storage by 2030 would offer overall benefit to Nevada, NV Energy will move forward with an Integrated Resource Plan: 1,000MW of renewables including 100MW of storage – by 2021.

Nevada could cost-effectively deploy between 750MW and 1,000MW of energy storage by 2030, according to an economic study commissioned by the state’s rulemakers to investigate the potential for the technology.

Utility Xcel Energy’s latest resource plan for Colorado, aimed at increasing renewable energy generation and aiding the retirement of coal plants, was approved by the state’s Public Utilities’ Commission (PUC) on Monday.

Hawaii has been a prolific installer of both rooftop solar and latterly batteries for energy storage and one of the US state’s smaller islands looks set to get its first ever grid-scale solar-plus-storage system.