Brewdog is aiming to raise £25 million to extend its brewery in the latest round of its “equity for punks” crowdfunding initiative.

The Scottish brewer is 526,316 shares and plans to use the money to buy up land bordering its Aberdeenshire site and expand the operation to increase capacity and broaden its range.

A new 300 hl brewhouse would operate in tandem with its existing 100 hl brewery and Brewdog said it would allow the business to increase its production fivefold.

Co-founder James Watt said: “In 2010, we tore up convention, turned the traditional business model on its head and launched equity for punks, giving thousands of people a front row seat to the craft beer revolution. And now it’s back, bigger and better than ever, giving [investors] the opportunity to own part of BrewDog and share in our future growth.”

It is hoping to start producing sour beer, and extend its range of beers in 33cl cans by building a canning line.  Some of the money would creating more “ambitious, bizarre and progressive beers”.

It would also invest £2 million in environmentally friendly technology such as a biomass generator.

A further £7 million would go on expanding its bar empire. It also plans to open a US microbrewery and set up a UK import and distribution arm.

Watt said: “We are looking to establish an import and distribution division, making it easier for customers to get their paws on Brewdog beers and a selection of great craft beers that we import from all over the world. We are already the exclusive UK importer for Stone Brewing Co’s beers and we also regularly ship Mikkeller, Ballast Point, AleSmith, Oskar Blues and Lost Abbey beers to the UK.

“Our import and distribution model would all be based around getting beers to customers in fantastic condition, and we would be one of the only UK beer distributors to only use refrigerated transportation to ensure all beers arrive tasting great.”

He added: “With the success of our TV show in the US, more people stateside want to get their hands on BrewDog beers. We intend to establish a small brewing operation to help them do just that.

“This launch in the States would enable us to continue to grow our business in the world’s biggest craft beer market. We believe there is a huge thirst for BrewDog beer in America, and this move would be the perfect way to help quench it.”