I've been interested in this for some time. Here are some solutions I've come across:
Something like a standard battery
Flow batteries, where you store liquid electrolytes in tanks, and energy capacity is proportional to the capacity of the tanks
Salt/Liquid metal batteries. Take the process for smelting aluminium, and make it reversible. (The metal used need not be aluminium.) There is a good TED talk on this.
Fixed volume compressed gas storage: pump gas into a pressure vessel or abandoned mine
Fixed pressure compressed gas storage: pump gas into a bladder deep under water. This works well for off shore wind farms, as they have the deep water right there. Otherwise you need a convenient lake or flooded mine.
Elevated water reservoir. Needs the right topography and hydrography, so doesn't work everywhere.
Variable output hydro power: similar to the above, but instead of pumping water uphill you just increase/decrease the downhill flow that already exists, to match you output to the production shortfall of the time variable generators. If you already have hydro power, this is very cheap, possibly free. At worst you need to increase peak capacity by adding turbines.
Heat storage: store energy as heat in a large thermal mass, extract it with some form of heat engine.

Complementary to this, we can also try to time-shift demand:
Off-peak water heating. This has been around for many decades.
Off-peak heating/cooling using thermal storage (e.g. an insulated water tank under your house from which your radiators are fed.)
Off-peak charging of plug-in electric cars. (We can even use peak-hour extraction of power from the electric cars.) This is cheap in that those batteries are already there for other purposes. It does cost if they batteries have a limited number of recharge cycles (which currently they do.)

The cameras are likely to "accidentally" break anyway

The won't be "accidentally" breaking when the perp is actually being belligerant, which is most of the time there is an incident. If we were to posit that the cop is telling the truth in the Michael Brown case, the weeks of disruption, rioting, looting, vandalism, and arson could have been obviated by the timely release of the video.

For most species, childhood is all risk, no benefit (where benefit = breeding), and so it is to be got through as fast as possible (or at least in time for next breeding season). If glucose shortage was the only reason for doubling the length of our childhood, there would be a huge evolutionary pressure towards kids who could metabolize much more food and reach adulthood in half the time.

There is an obvious reason why humans have such a long childhood - it is because we have so very much to learn. Little bodies can learn as well as big bodies, and cost less to maintain.

How many years in until Cook finally produces an innovative product? For the past three years, it's been all about belatedly adopting Android features. This fall, it will be the bigger screens Android phones have already had for years.

Wow, that's a lot. I wonder why they allow so much power per outlet?

Because of all those damn industrial vaccuum cleaners.

Yes, people with talent are overrepresented on TV. Most of us prefer it that way.

Well, it would be -- if Scots weren't already British. You numpty.

or "the dog ate my homework!"

Some new game changing battery/supercapacitor breakthrough might be just around the corner. If so, all that investment in the battery megafactory could get wiped out. Ditto with investing in lithium mining.

So the megafactory might be still happily minting money 25 years from now, or it might be nearly worthless 5 years from now. Presumably this means we'll be paying a risk premium on lithium and lithium batteries. It seems to me that it would be smart for Tesla to be investing in the very technologies that might disrupt their factory, as an insurance policy. That way, if the fortune you've invested in the factory evaporates, hopefully you'll have a new replacement fortune due to having a stake in the new technology. However, this strategy requires that you have the funds for this speculative investment, and has you encouraging the very research which will ruin your factory investment. (Also, maybe you won't have invested in the right places and won't have a stake in the new technology.) In the case of Tesla, they are major consumers as well as (soon to be) major manufacturers of batteries, so there is an additional up-side to investing in the hypothetical tech breakthrough.

Is lithium mining expanding fast enough to feed this factory when it comes online?

From TFA:

“Now we’re going to give you what you deserve for meddling in our business and when we finish with you, you can sue the city for $5 million and get rich, we don’t care,” Lt. Dennis Ferber said, according to the suit filed in Brooklyn Federal Court.

It appears the police followed exactly your logic. However if that statement is substantiated, Ferber's boss would be seriously derelict in their duty if they didn't fire him for this. He's publicly stated that he doesn't care about knowingly causing a multi-million dollar liability for his employer. IANAL, but I expect that should these cops not get punished and pull a similar stunt again, the city would open themselves up for greater punitive damages, as they'd let employees with a known track record of rights abuse continue working where they were likely to abuse again.

It would be good to see criminal proceedings, but I doubt it will happen.

To paraphrase, "How about just shutting down all industry and going back to the caves?" A de-industrialized civilization could only support billions fewer people than are alive today. You would need to 'cull' all of the excess. But really, westerns will never voluntarily accept even energy poverty, so your mass-extermination plan is a no-starter.

Nuke the server from orbit. It's the only way to be sure.

That doesn't address the desire to send text messages during protests without being eavesdropped .

Or the issue of documenting the event and not having your phone taken off you, thus losing all those pics/vids/etc.

One function of special vocabulary is for specialists to easily communicate. But another, important, social function is as a badge of in-group membership. If you use the words correctly (from the point of view of the group) you show that you belong, and that you probably know and understand all the other explicit and implicit rules of the group. If the word use spreads too far it loses this function and the group needs to find new words and expressions instead.

You dislike "gelling". You dislike "paradigm shifts". It would probably be a fairly risk-free bet on what you think of expressions like "optics" (as in "the optics of this decision is good") and the like. You dislike these words and refuse to use them. Which signals to management people that you are not management and should not be treated as part of their in-group. "gelling" works exactly as intended, in other words.

Asking for words to not be used like this is futile. It would be like asking people to no longer care about fashion (another in-group signal) or to not form groups of like-minded people at all.

Not many other countries intentionally bankrupt accident victims the way the US does.

I don't live in the US, and I agree. But, if you're found liable for an accident you will tend to pay a lot of money in any country; the accident victims likely have life or accident insurance and their insurance company will want to get reimbursed.

So good, comprehensive accident insurance is a very good idea no matter where you live. Usually we have that as part of our home insurance or other thing like that, and if you own a car you have mandatory insurance for that.

But in a case like this you may well be completely uncovered. The vehicle insurance is likely not valid for commercial traffic, and your home insurance may well not be valid either. As I said, I would never, ever get into a car like this without first being absolutely sure that the liability situation is crystal clear.