Because it's greener

... than the electric chair.

(b) When the penalty of death is imposed, the punishment for a defendant convicted under RSA 630:1, I(g) shall be execution by firing squad. If execution by firing squad is to be carried out, the commissioner of the department of corrections or designee shall select a 5-person firing squad of peace officers. The commissioner or designee shall ensure that the method of judgment of death specified in the warrant is carried out at a secure correctional facility operated by the department at an hour determined by the department on the date specified in the warrant. Compensation for firing squad members shall be in an amount determined by the commissioner of the department of corrections.