Here in NM the main utility will not allow a zero sell installation, period. 

Some heavy hitters have been trying to get it allowed, but so far haven’t been successful. 

Hence my asking what the rules are in other places. 

Thx
Jay



On Feb 11, 2025, at 3:37 PM, James Jarvis via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:


The interesting thing to me is that a ton of industrial equipment has regenerative braking that puts power back "on the grid". Lots  of things with a frequency drive and a motor that stops has been built this way for 30 years. Things that stop like CNC machines and elevators. Pretty much anything that stops quickly and doesn't have a big braking resistor on it just pumps the power back to the AC side.

In 20 years of owning and running industrial facilities, no utility has ever once had any concern about that.

FWIW,


-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727
http://www.aprsworld.com/


On Tue, Feb 11, 2025 at 4:18 PM Sam Haraldson via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
The utility here in Montana requires any small-generator facility to have an interconnection agreement with them.  A standard net-metered agreement is called a Level 1 Agreement and a non-export system falls into their Level 3 Agreement.  The relevant text from that agreement is as follows:

The... requirements are designed to ensure that the Small Generator Facility... are designed to prevent back-feeding of power from the generating facility to the utility grid during power outages, and to match... power characteristics with respect to voltage and frequency. 

Cheers,
Sam

OnSite Energy
SAM HARALDSON  
Operations Specialist
(406) 551-6135
1515 N. Rouse Ave Bozeman, MT 59715
Locally owned and operated since 2012
B Corporation
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