From New Scientist:
Something odd is happening on President Street in Brooklyn. While solar panels on the roofs of terraced houses soak up sun, a pair of computers connected to the panels quietly crunch numbers. First, they count how many electrons are being generated. Then, they write that number to a blockchain. Welcome to the future of energy exchange.
This project, run by a startup called Transactive Grid, is the first version of a new kind of energy market, operated by consumers, which will change the way we generate and consume electricity.
Transactive Grid aims to enable people to buy and sell renewable energy to their neighbours. To deal in energy at the moment, you have to go through a central company like Duke Energy in the US or National Grid in the UK, or one of their resellers.
Transactive can skip this central authority because its energy market is built on a technology called blockchain. First used to underpin the bitcoin currency, a blockchain is a cryptographically secure list of transactions. The list is stored on every computer in the system, and is continuously updated as each transaction is completed. The list for President Street is built using blockchain software called Ethereum. It deals with buying and selling electrons generated by solar panels. No central authority is in control: the computers monitor each other to stop fraud.
Buy and sell
The first devices were installed on President Street a few weeks ago. On one side of the street are five homes that produce some of their own energy through solar power. On the other side are five consumers interested in buying excess energy from their neighbours.
Lawrence Orsini, co-founder of Transactive explains that the blockchain makes it easy for anyone to set up and enforce contracts, with the transaction following automatically.
“You don’t have the billing components around it, you don’t have the infrastructure losses or the accounting losses in the system,” he says. Down the line, the company plans to build an app which lets residents set personal preferences for the distribution of the energy they produce. One homeowner might decide to sell all their excess energy for maximum profit, for example, while another could choose to donate a portion to a low-income area.
This is the first example I have seen of use of blockchain that I would be willing to try out. Call me old fashioned, but I am having a hard time buying Bitcoin. I just can’t put my hands on it and I’m not sure I can really count on its security or availability. Call me old fashioned.
But then they say this:
Either way, the energy and the money goes to benefit the community, says Orsini, not the large centralised power company. “When you buy energy from the community, the money goes back to the community.”
“Every kilowatt you buy, you pay for network. If you can cut out the middle man and do the trade directly, you don’t have to pay for the wires,” says Philipp Grunewald of the University of Oxford.
I don’t get it. What wires are transmitting the electricity back and forth across President Street? The article talks about a localized microgrid. So did they put in new wires? How does that get paid for? I think the utilities will still need to be included in these transactions somehow, and I don’t think that’s a bad thing. Do we really want to eliminate the entire electricity network?