If electoral register is created by the EMB, which method is used?

Elections Act 24 of 2011 (last amended in 2017)

5. Registration of voters

(1) Registration of voters and revision of the register of voters under this Act shall be carried out at all times except—

(a) in the case of a general election or an election under Article 138(5) of the Constitution, between the date of commencement of the sixty day period immediately before the election and the date of such election:

Provided that this applies to the first general election under this Act;

(b) in the case of a by-election, between the date of the declaration of the vacancy of the seat concerned and the date of such by-election; or

(c) in any other case, between the date of the declaration of the vacancy of the seat concerned and the date of such election. […]

However, before the 2017 General Elections, the “continuous registration was supplemented by IEBC mass voter registration exercises at the beginning of 2016 and again in 2017.” See EU Election Observation Mission – Kenya 2017: Final Report