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Welcome to tech News Briefing. It's Friday, February 23rd. I'm Alex Oscela for the Wall Street Journal.

Coming up on today's show, a growing number of startups

are storing energy as heat in big blocks of carbon, bricks,

and salt.

W.S.J. Climate Finance reporter Amrith Rum Kumar

tells us why that could have a big impact on global emissions.

And then, Elon Musk's SpaceX has long had a relationship with US national security agencies.

Now it's becoming the go-to contractor to get satellites into space quickly.

We'll hear from W.S.J. reporter Drew Fitzgerald about what that means for the future of

SpaceX's business and its competitors.

But first, to make things like steel and cement, factories need to work at really high temperatures,

and that requires a lot of energy. Industrial heat accounts

for roughly 10% of greenhouse gas emissions. Now, the growing field of thermal batteries

promises to help companies replace fossil fuels with green energy and

investments are heating up.

W.S.J. Climate Finance reporter Amrith Ram Kumar joins me now with more.

...