If a provider of electricity has revenue grade meter data on the quantity of exports to the grid from a qualifying storage system as defined in N.H. Rev. Stat. § 362-A:1-a to the extent that it is charged from the grid, such amounts may be deducted from the calculation of electricity supplied by the provider to its end-use customers for the applicable year for purposes of compliance with N.H. Rev. Stat. § 362-F:3 as determined and provided for by the commission.