Electrical energy storage (EES) is the holy grail which will solve the intermittency problem with wind and solar thereby allowing the promise of "free fuel forever" to be more widely implemented. Many large, well-capitalized companies have been pursuing the prize for decades.
Previously I referenced AES to illustrate that point: "AES Energy Storage has a total of 432 MW of interconnected energy storage, equivalent to 864 MW of flexible resource, in operation, construction or late stage development
in seven countries,"
The AES Corporation - Our Business - Overview , including a 28MW grid stability resource in northern Chile that has been operating since 2009.
"One of the most widely used methods is based on the form of energy stored in the system ... as shown in Fig. 3, which can be categorized into:
- mechanical (pumped hydroelectric storage, compressed air energy storage and flywheels),
- electrochemical (conventional rechargeable batteries and flow batteries),
- electrical (capacitors, supercapacitors and superconducting magnetic energy storage),
- thermochemical (solar fuels),
- chemical (hydrogen storage with fuel cells) and
- thermal energy storage (sensible heat storage and latent heat storage)."
Overview of current development in electrical energy storage technologies and the application potential in power system operation
To put into perspective your sarcasm about my statement that you keep quoting, Tesla announced it was going to enter the EES market in April 2015 with an offering in one of the six above categories, using one, or possibly two chemistries, for Li-ion rechargeable batteries.
Yes, TE completed several large installations in 4Q16 over 18 months after its initial announcement, but GM% for TE in 4Q16 was deeply in the red. TE has had successes in California, aided largely by SGIP and the connections of former regulators at AMS. Whether TE can parlay that into penetration of EES markets in other states and countries will depend on execution over the next several quarters. Brand cachet is meaningless in EES markets; it's primarily about being the lowest cost, reliable provider. Hopefully with earnings in about a week, Tesla will clarify if it is achieving the 30%+ cell cost saving projected now that the GF is operational.