LONDON (Reuters) - The GMB union on Friday announced a series of new strike dates at Centrica's British Gas in a dispute over proposed changes to work conditions.
The GMB union has already carried out one-day strikes this year in protest over what it calls a plans to "fire and rehire" and cuts to workers' pay and terms.
The new industrial action will be in three lots of four-day strikes, beginning Feb. 12, Feb. 19 and Feb. 26 - ending at 23.59 GMT on March 1, the union said.
Justin Bowden, GMB national secretary said the union's council vowed to carry on strike action through to mid- April.
Some 7,000 engineers have taken part in the previous strikes, the union said.
Centrica said it has offered a fair deal which protects base pay and pensions.
"Eighty three percent of our employees have already agreed to the new terms," a Centrica spokesman said in an email.
Centrica last year cancelled its dividend and announced plans to cut about 5,000 jobs, almost 20% of its global workforce.
Centrica CEO Chris O'Shea told a cross party group of British lawmakers earlier this week the changes to workforce conditions were needed to ensure the company remained competitive and to safeguard existing jobs.
(Reporting By Susanna Twidale; Editing by Jon Boyle and David Evans)