A logical move by an Oil major. Will be followed by others? Coal, NG and electricity suppliers will most probably also move in REs with storage with large and small distributed units?

TESLA-Panasonic will have serious competition?

Will TESLA-Panasonic build mega-factories in Asia and EU to supply local markets?

Solar + Storage is better than Solar alone, but you will still need a dispatchable power source (such as gas) for runs of dull days.
If you have a system that can generate and store enough electricity to get you through a winter night, you will still have a problem if you get a dull day (or days).
Thus, you wtill need gas (or whatever), but you only need it (say 20 days / year), so the capital cost of the backup becomes very large (when divided by the output).

Nontheless, I think that is our future (mostly solar/wind + storage + transmission + rarely used dispatchables (oil/gas).

It won't be cheap, though.
[ Solar alone may be cheap, but by the time you have a reliable 365/24 system, it isn't cheap ]

H2 contains 142 MJ/kg = 40kWh.
Best Li-batteries contain 0.3 kWh/kg

One tesla powerwall has 6.4kWh.
This is as little as 150 grams of H2.

The Tesla powerwall deliverd 3.3 kW.
The Mirai fuelcell delivers 140 kW.

The H2 tank of the Mirai contains 5kg of H2. This equals 110 powerwalls !!!!!
And it is small, light and safe enough to put it in a car that may crash. So it is surely small and strong enough to place it where you would place a powerwall

With an efficiency of only 80%, this 5kg of H2 still equals 88 powerwalls.

So, if a powerwall can help you through 1 day, 5kg of H2 can help you through 3 months.

No Science fiction. Next gen fuelcells will be much cheaper than today's.
Mass-produced H2 tanks will become very cheap, and very scalable. If you want 20kg. Just put more tanks. (You don't need more fuelcells)

Distributed generation will definately be the future.

These state crooked everywhere are really dicided to kill the worldwide free market everywhere with these moron policies and regulations, now they want to convert by coward means the biggest profitable energy companies to stop providing what we need. Can we comfortably still produce cheap plastics, asphalt, jet fuel, gasoline, lubricating oil, diesel. These are the cheapest most abondant products that EVERYBODY is using. Stop this green taxpayer hoax and free the oil majors. These crooked medias, banks and politicians are behind this sheme and i hope trump will vindict them.

@ai_vin,
I agree the weight and volume of the fuelcell and electronics should be added to make a fair comparison.

The Mirai fuelcell delivers 114kW and fits in the car.
It has a power density of 3kW/liter, which means a shoe-box size (30cm x 15cm x 15cm) could deliver about 20kW (=3 powerwalls). you also need a small H2O tank to store the liquid pure H2O for cycling to H2 and back.
However, if the H2 is not cycled to H2O and back, but taken out to fill your car, you will also need water treatment stuff. in addition, you will need ventilation to evacuate the heat (20% of energy is lost while charging and while discharging, and also quite some energy to compress the H2). So it will become a lot bulkier than just the H2 tank. However, at this moment, the most crucial parts are already on the market and fit in a car that can drive around and should withstan car crashes, and has a huge power of 114kW.
A particular advantage is that the H2 tanks and the fuelcell are separate. so, increasing your capacity can be done independent (and very cheaply) from your power output. You only need an additional tank.
All together, the electronics and fuellcell would surely be much smaller than a fridge or a washing machine. For the tanks it would depend on the pressure and capacity, but for a capacity equal to the powerwall (less than 300 grams of H2 !!!), it would also surely fit in the small box.

It can be done by having everyone its own power plant at home, which is more expensive (though ultimatly probably still quite cheap), but practical to utilise the waste heat, and comfortable because distributed electricity generation with millions of small powerplants connected to the smartgrid gives a very robust, reliable and independent grid, most likely with very abundant power capacity.
The alternative is relatively small fuelcells of for instance 10MW (which is only 100 Mirai units in parallel), distributed in the cities, but operated by companies. This is still very distributed compared to today's powerplants, and much more "free market". This also would allow heat use for buildings, companies, hospitals...

Just like second-life car batteries can be used for at-home electricity storage, second-life fuelcells from H2 cars will soon be available that can be used for this. If you compare the power of a car with the power needs of a house, very few "recycled cars" can provide all the power we need.

Anyway, I am very confident that the weight or volume will be a non-issue, while very economical to store green electricity for months.
A particular additional advantage is that large scale deployment makes the whole H2-economy very cheap, opening many other opportunities, such as synthetic jet fuel, synthetic food (via chemotrophic bacteria, which could produce huge amounts of food from renewable energy + air(for CO2) + seawater(for H2O and minerals)).