The Essex Record Office have recently announced that they are releasing digital images of Electoral Registers for Essex as part of their subscription package, or they can be viewed for free at their search room.
The Record Office hold registers from 1833 to 1974 and these will be released in phases. The first phase are Electoral Registers from 1833 to 1868. It is hoped that the project will be completed by January 2018.
Altogether, the collection consists of 850 volumes containing thousands of names of those eligible to vote in Essex. The archive is not searchable by name, but the registers are compiled on a parish by parish basis and then the names are alphabetical so it is fairly easy to find your ancestor if you known the name of the parish they lived in.
It is also a good resource for those researching the history of their house.
For more information, read the announcement on the Essex Record Office blog.