From the article: "The NDP plan would also increase the general corporate income tax fund by a percentage point, bringing it to 12 per cent from 11 per cent."
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For what it's worth B.C. is expecting to bring $3,413M in corporate tax revenue for the current 2017/18 fiscal year with an 11% tax rate.

If one were to take a straight percent-to-percent increase from 11% to 12% that would raise revenues to $3,723, or an extra $310M.  However historical evidence from Canada and other countries suggests that actual revenue increase will be SUBSTANTIALLY lower, probably between 1/3rd and 1/2 that amount even without looking at secondary effects (eg. reduced personal income tax due to higher corporate tax).  So at best they're looking at about $150M/year in extra revenue here.

In reality, adding in the secondary effects, it is probably closer to $0 in extra revenue.