Charmat (Tank) Method
Charmat (Tank) Method: The Modern Sparkling Wine Technique
The Charmat Method (also known as the Tank Method) is a method of producing sparkling wine in which the secondary fermentation (where the bubbles are formed) happens in large pressurized tanks rather than individual bottles. This method is most commonly used for producing wines with fresh, fruity flavors and lively bubbles, like Prosecco and Asti Spumante.
How the Charmat Method Works
- Harvest & Pressing – Grapes are harvested early to preserve acidity, then gently pressed to extract the juice.
- First Fermentation – The juice undergoes its first fermentation, producing a base wine.
- Secondary Fermentation in Tank – The base wine is transferred to a pressurized stainless steel tank, where sugar and yeast (the “liqueur de tirage”) are added. The fermentation produces carbon dioxide (bubbles) in the tank.
- Aging on Lees – The wine is left to age on its lees (spent yeast) for a period, typically a few weeks to a couple of months. This adds freshness and subtle complexity, though not as much as in the Méthode Champenoise.
- Filtration & Bottling – After fermentation, the wine is filtered to remove yeast sediment, then bottled under pressure to preserve its bubbles.
