Tesla has had a lot of big headlines over its success with its EV business. During Q3 the company turned its first quarterly profit in, well, as long as we’ve been covering the company, and maintained profitability during Q4 on the back of the successful scaling of its Model 3 production.
The company’s success with energy storage is less talked about. Tesla continues to scale its energy storage deployments, but on the solar side the company has clearly ceded SolarCity’s former market leadership to competitors.
During Q4 both of those trends were clear. The company deployed 255 megawatt-hours of energy storage to reach a total of 1,040 megawatt-hours for the full year, including deploying the world’s largest lithium-ion battery in Australia. This is a nearly 3x growth over 2017 levels.
Tesla observed operational success as well, and says that it cut its sales-to-installation time on energy storage systems in half in 2018. And while it is far less than the “mad growth” of 300-400% that Musk predicted for 2019 in August, Tesla still expects to double its 2019 energy storage deployments.
This includes bigger and bigger batteries. Following on the Hornsdale deployment in South Australia, Tesla says that it has received “multiple requests” to build even more massive batteries.
Solar Roof deployment “slow”
But while the battery business grows, solar continues to contract. Tesla reported only 73 MW of retrofit PV systems in Q4, a 21% decrease sequentially. The shareholder letter specifically used the word “retrofit”, and did not state how many of its Solar Roofs it had deployed.
Despite a lot of hype in the rollout, Tesla has been very hard to pin down on what is actually happening with Solar Roof production and deployment. The promises of the future are still there, with Tesla stating that it plans to ramp production of the product with “significantly improved manufacturing capabilities during 2019, based on the design iterations and testing underway”, but notes that installation at present are “slow”.