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kaszz [soylentnews.org] writes:

At least 1 million homes in the USA have solar systems [greentechmedia.com] on their rooftops and their use together with local batteries is increasing, enabling homeowners the ability to collect energy and store it for later usage on-site. Enabling homeowners to cut their dependence on the electrical grid and their bills. This could be economically painful for utilities. A new McKinsey study [mckinsey.com] predicts two outcomes 1) electrical grid cut off completely 2) primarly local energy collection and the electrical grid as a backup.

The cost of of collecting solar energy and store it on-site makes the incentive too small even for residents of sunny Arizona [qz.com] to cut the electrical grid off. But partial defection from the grid with 80-90% of the demand supplied on-site makes economic sense in 2020 and total defection makes sense around 2028

The prediction by McKinsey is that the electrical grid will be repurposed as an enormous, sophisticated backup. Where utilities only adds energy at those times when the on-site systems aren't collecting enough energy.

My comment: So far good enough. But then why not simple connect to neighbors directly for electrical power transfer and cutting the utilities out of the loop even for electrical fallback needs?
A electrical power mesh grid might need some interesting mathematical modeling though.

(As a side note, maybe this makes UPS for home use obsolete soon enough?)

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