Energy storage

Solar

Puerto Rico closes $861M DOE loan guarantee for huge solar-battery project

The island has ambitious climate goals and a ton of rooftop solar, but has so far built few large-scale clean energy projects. Project Marahu could change that.

By Akielly Hu . 15 October 2024

Solar panels in Humacao, Puerto Rico. (Lester Jimenez/AFP via Getty Images)

Long-duration energy storage

Why Energy Vault went from disrupting batteries to selling them

The buzzy startup raised a record $110M back in 2019 to transform grid storage with novel long-duration tech, but now it's embracing industry favorite lithium-ion.

By Julian Spector . 16 October 2023
Energy storage

Grid batteries have never been more abundant — or more useful

This summer, batteries bolstered the heat-battered grids of Texas and California, underscoring the tech’s value as a low-carbon way to keep the lights on.

By Julian Spector . 2 October 2023
Batteries

Is graphene a cleantech supermaterial? This startup thinks so

Lyten recently raised $200M to scale up production of batteries made with graphene, a material that’s light, strong, conductive — and elusive.

By Eric Wesoff . 25 September 2023
Batteries

Chart: The remarkable rise of California’s grid battery capacity

In 2020, California had 500 megawatts of grid battery storage. Now, just three years later, it has over 5,000 megawatts.

By Julian Spector, Maria Virginia Olano . 22 September 2023
Batteries

Looking for some home energy storage? You’ve never had so many choices

The once-tiny residential battery market is attracting dozens of new entrants, including recognizable consumer brands like Anker, Duracell and Energizer.

By Julian Spector . 21 September 2023
Solar

The fight over California community solar: 'It's everyone vs. utilities'

Α broad and unlikely coalition has united behind a proposal that would finally let community solar flourish in California. Utilities are trying to stop it.

By Jeff St. John . 5 September 2023
Clean energy

Hawaii quit coal one year ago. Here's how it's been going

The lights stayed on, but the state's experience offers some lessons on what can go wrong in the transition to clean energy.

By Julian Spector . 31 August 2023
Energy storage

Texas hooked up its first virtual power plants to help the grid

Select customers now have the power to participate in Texas energy markets with their own devices — and to get paid for doing so.

By Julian Spector . 31 August 2023
Batteries

New York is reeling from its hot battery summer

The state's ambitious clean energy buildout has hit an unexpected setback after three different grid batteries caught fire in the span of two months.

By Julian Spector . 21 August 2023
Long-duration energy storage

Is Azelio's abrupt bankruptcy a bad omen for long-duration energy storage?

Many say long-duration storage is the energy transition's holy grail, but startups in the space are staring down brutally tough market conditions.

By Eric Wesoff . 3 August 2023