Most European residential electric systems operate at 240v, versus 120v in the US, which means you can only backfeed a US outlet with half the power you could in a European outlet. That alone makes this system half as useful for US applications.

Remember the tmobile un-contract? This is literally from their press release in 2017: “T-Mobile ONE customers keep their price until THEY decide to change it. T-Mobile will never change the price you pay for your T-Mobile ONE plan. When you sign up for T-Mobile ONE, only YOU have the power to change the price you pay.” https://www.t-mobile.com/news/press/un-carrier-next

Remember how they promised the FTC they wouldn’t raise prices if they could pretty please merge with sprint to become the biggest telecom network in the country? https://www.yahoo.com/news/t-mobile-promises-sprint-merger-195428217.html

Most places where this can be done, it is already being done. The low hanging fruit for pumped hydro was all picked decades ago, and at great cost to the ecosystems it destroyed in the process - turns out that drowning thousands of acres in massive man-made lakes had a bit of an impact on the plants and animals that lived there.

Not saying that the benefits weren’t worth the cost, that’s a whole different debate. But there’s little to no opportunity to scale this energy storage tech beyond it’s current footprint.

As a professional engineer who literally designs solar power plants for a living, this is not how electricity works. It is true that solar inverters can throttle their output by operating at non-optimal voltages, but you can’t just dump power into the ground without causing major issues to the grid infrastructure.

They have frequent sales, i got it for under 300

Don’t forget the RGB notification led!

I switched to Chinese brand phones, they still have all this and they’re dirt cheap, currently rocking an Ulephone power armor 18t, which also has a flir infrared camera and a microscope for some reason. No I’m not joking, they work surprisingly well and have come in handy more than I thought they would!

As others have mentioned, you can invest in the stock market within your 401k, though your options can sometimes be limited or saddled with high fees depending on what broker the 401k is through.

If yours is through a shitty broker then you might be better served by opening an individual retirement account (IRA), likely a Roth IRA given the limited info you’ve shared. You can open one with a broker of your choice, so go with one of the better ones like vanguard or fidelity. Using tax advantaged retirement accounts will always beat saving your retirement money in a non-tax advantaged one, all else being equal.

Edit to echo the flowchart from one of the other comments: https://imgur.com/u0ocDRI

This is the core of sound personal finance strategy in purified form. Great resource!