The grocer has not put a date on the when the promotion will finish and has not ruled it out lasting beyond the summer. It also said that the activity was more of a "continuation" than an "extension". The promotion gives customers two points for every £1 they spend.
When the loyalty-card scheme was re-launched in May, as part of a £150m investment, the ‘double points' offer was limited to categories including clothing (in-store only), cosmetics, skincare and fragrance (in-store only) and wine and champagne (purchase either in-store or on its wine website)
The offer was then updated in August to include all purchases made in-store and online, excluding products such as tobacco, lottery and infant formula.
In December Tesco sent out an additional Clubcard voucher mailing worth £67m, which resulted in customers redeeming £34m more vouchers than in the same period in 2008 and contributing 0.7% to UK like-for-like sales growth.
Tesco, which is celebrating the 15th anniversary of Clubcard, this month, has also launched an iPhone App which turns the phone into an electronic Clubcard, enabling customers to scan the phone screen without having to search for their card.
Rival Sainsbury's mimicked the Tesco activity in October offering customers double Nectar points for two years when they take out selected finance products, equivalent to an additional 1% off their Sainsbury's shopping bill.
Last week Sainsbury's claimed its Nectar initiative is now the biggest loyalty scheme in the country, with more people signed up than its two main rivals, Tesco Clubcard and Boots Advantage card. Nectar said it has 16.8 million people using the scheme, which, since launching in 2002, has 14 partners and more than 400 online retailers.