Tesla has stuck a deal to put solar panels and Powerwall batteries on 50,000 homes in Southern Australia. The homeowners will not pay for the equipment. They won’t even own it. Instead the equipment will be owned by the utility company, and the 50,000 homes will become a “virtual” power plant – operating as independent pieces of a giant grid. For everyone in the system this will lower power costs by over 30%, and improve the performance where outages are a big problem.

This is really, really smart. The old way of thinking about power generation was a big plant, usually coal, gas or oil powered. Or, a giant group of solar panels in a desert, or a giant group of windmills. Or, a nuclear-powered plant. This centralized generation is then shipped over power lines to homes and businesses.

The problem is that transmission can lose anywhere from 20% to 80% of the power. Thus, the bigger the plant in theory the lower the power cost – but that is only for generation. After factoring in the cost of transmission losses, and the cost of building and maintaining transmission lines, the cost can be quite high. And thus the resulting never-ending increases in electricity prices even as traditional feedstocks go down in cost. Decentralized power generation, in a grid of small production, nearly eliminates transmission losses and uses renewable sources in the most favorable way.

Nobody should be surprised that Tesla is a leader in this program. Back in September, 2016 when Tesla took over (or merged) with Solar City I strongly made the case that this would be a good move. The ability to make solar shingles, solar panels and store large power amounts in whole-building batteries is a game changer for how we make, and consume, electricity. As utility commissions keep realizing the problems with building ever-larger centralized plants, decentralized systems that truly utilize grid management are simply a smarter, cheaper, better way to power our homes and offices.

Most people think of Solar City as “just another home solar system.” That would be wrong. Solar City has the ability to power entire towns and regions with their system of production, storage and grid management. And that is great for Tesla shareholders. Tesla has shown it is a game changer with products like the Model 3, and the combination with Solar City actually creates a utility industry game changer, as well as auto industry game changer, that could put a hurt on companies like Exxon. Now, like when I recommended buying Tesla in January, 2015, you should be thinking long term about the opportunity for outsized returns a game-changing company like Tesla provides.

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