Effective August 3, 2012, net-metering provision as approved by the MA DPU limits net-metering to 3% of a utility's historical peak load for private customers and 3% for public entities. The amounts of projects that fall under these caps are as follows:
National Grid’s historical peak load of 5,131 MWs occurred on August 2, 2006 in Massachusetts Electric territory; making each 3% limit 153.93MW.
As of June 6, 2013, in Massachusetts, there are 73,845 KWs with net-metering service under the private limit and 7,072 KWs with net-metering service under the public limit. The private limit includes those public entities whose generator rating is less than 60kW. Neither limit includes projects that qualify as exempt Class I Net Metering Facilities (see 220 CMR 18.07(5)).
As of June 6, 2013, there are 309,968 KWs with applications in the process of being interconnected under the private entity cap and of those 60,970 KWs have returned the Schedule Z.
As of June 6, 2013, there are 47,980 KWs with applications in the process of being interconnected under the public entity cap and of those 8,011 KWs have returned the Schedule Z.
Please note: Under current Massachusetts state law, once the limit is reached, net-metering credits will not be available. You will be eligible for net metering credits only if there is still capacity under the limit to accommodate the full rating of your facility at the time you receive your "Authority to Interconnect" letter.
Please refer to the below links on the ISO-NE website for further information:
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