Wind is currently the cheapest way for suppliers to produce electricity, with solar catching rapidly. Rooftop PV is the cheapest way for homeowners to meet their household energy needs. But although over 1.3 million Aussie homes have solar panels on their roofs our nation still produces a LOT of emission from electricity generation. In my humble opinion the only thing holding the electrical revolution back (other than vested interests) is storage.
The variable nature of the renewables means that our society’s current energy habits can’t be fully satisfied without a much greater investment in renewables at a scale that is not achievable by the individual and seemingly undesirable by our government. If only there was a way that the excess energy being produced by renewables during peak times, especially rooftop solar during the day, could be stored and used at night.
Another area where energy storage has been holding the electric revolution back is cars. There have been many excuses the motor industry has given for not producing electric cars: cost, performance, long recharge times, range anxiety, battery lifetime. Tesla Motors has pretty much single-highhandedly addressed everyone of these excuses. Tesla’s latest car, the Model S, is incredibly quick, can go up to 500km on a single charge and is competitively priced with rivals. However, the naysayers out there will still complain that Model S isn’t a car for everyday people (as it is a luxury car with a $100,000 price tag) and that the recharge time, which is a few hours, is too long as it only takes a few minutes to fill a car with petrol. However, it looks like all the remaining hurdles on the path to the electric revolution (households storing energy from rooftop solar, electric cars being too expensive and the recharge time of electric vehicles being too long) are about to be jumped.
Tesla Motors is creating the world’s largest battery factory, which it calls a Gigafactory. Once the Gigafactory is fully operational by 2020 it expected to double the world’s production of lithium-ion batteries, and bring prices down 30%. The massive increase in battery numbers will allow Tesla, and other car manufactures, to greatly increase the number of electric cars being built, and greatly reduce costs. This extra supply will also help increase availability and affordability of energy storage options for homes, the impact which is best described by this article; here are my highlights:
Just as the precipitous decline in the cost of solar cells and wind turbines over the past 10 or 15 years has made it possible for people to easily make their own power, these batteries will make it possible to easily and cost-effectively store it, freeing consumers from the tyranny of the big power companies.
And it will happen fast, according to Jemma Green, a researcher at the Curtin University Sustainability Policy Institute.
“We’re talking about grid parity in 24 to 36 months,” she says.
“And what that means is it will make more sense to put batteries in and store excess energy during the day than it will to buy power from the grid at night.”
In as little as 2 to 3 years households world-wide may be in a position to disconnect from the grid (although in practice probably wouldn’t want to) and consume nothing but clean energy and zero on-going cost. Although the Tesla Gigafactory will address energy storage, it won’t help with improving recharge times for electric cars, but don’t worry, someone else has.
Researchers at Nanyang Technological University in Singapore have figured out how to make lithium-ion batteries with a new architecture, which speeds up the charging time and increases the battery life by a factor of 10 or more. Thus allowing cars to be recharged in as little as 5 minutes. The best news is that the team believe the technology is only 2 years away from being on the market.
It appears that the next few years are going to see a lot of changes in world of energy storage, which should hopefully cause event bigger changes in global energy generation and usage.