Blast Shards

In inFamous, there are a total of 350 blast shards.

In inFamous 2, there are a total of 305 blast shards.

Collecting blast shards will increase the maximum capacity for storing energy in Battery Cores for Cole. This means you can shoot off more electricity before you run out completely.

However, Blast Shards are not necessary for game completion, but are a good way to spend your time in Aftermath (Level 40, after beating the game. The player is allowed a free play and can complete anything left unfinished).