That’s not what usually happens when you scale up mass production.

Tesla now charges more for its Powerwall than it did back when the product launched in October 2016.

The company’s website now lists the starting price for the 7-kilowatt/13.5-kilowatt-hour storage system as $5,900 — a $400 increase from the original list price of $5,500. The actual price to a customer will be higher still, because it includes supporting hardware, installation and other fees.

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The $5,900 rate applies to new orders; orders placed before February 22 will have the previous pricing, a Tesla spokesperson clarified by email Thursday. 

“Tesla evaluates its global pricing of energy products based on various factors and continues to make improvements that will simplify homeowner experience,” the spokesperson noted. “Powerwall continues to provide great value for customers and installers.”

Read more: Greentech Media