There is nothing "Green" about wasting electricity. "Green" power is efficient power.
Batteries can be charged off the grid during periods of peak renewable power production and/or low power demand and discharged into the grid when the inverse is the case. Batteries which have lost their capacity below a determined efficiency can be recycled in a closed loop. Using batteries to power generators has been obsolete for probably four decades by now. Solid-State inverters are a highly efficient solution to feed the power back to the grid. There is no need for the batteries to be "piped" or shipped via any mode. Power is efficiently transferred via the grid. Not by moving the batteries.
As for transportation, batteries are a far more efficient choice than a rolling fuel cell consuming formic acid.
Considering that only 4% of the formic acid consists of actual reactant (hydrogen) and 96% waste (carbon dioxide), you would literally have to pull a tank car behind you. And don't forget the tank of compressed O2 you'll have to bring as well. Far more efficient to use a pure hydrogen/oxygen fuel cell. But even that does not match the efficiency of a battery.
Mantra's process converts CO2 into formic acid with an electrically inefficient process, ultimately releasing waste CO2 into the atmosphere for no net reduction in CO2 emissions. Net result: A waste of electricity with no improvement in carbon emissions.
General Electric is not falling for it.
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