Behind the meter power, explained
Behind the meter is a simple idea with large consequences. It means generating power on the customer's side of the utility meter and using it on site, instead of buying all of it from the grid. For homes this usually means rooftop solar and a battery. For data centres, mines and heavy industry it can mean hundreds of megawatts of on-site generation.
What behind the meter means
The "meter" is the utility's revenue meter, the point where the grid hands power to a customer. Enel North America describes the distinction this way. Front-of-the-meter systems are the large-scale power plants that are interconnected with the distribution and transmission systems. Behind-the-meter systems are connected to the distribution system on the customer's side of the meter, so the energy they produce is used on site and does not pass through the meter.
Why large loads are moving behind the meter
For a small site, behind-the-meter generation is mostly about lowering bills. For a large new load it is often about whether the site can open at all.
Grid connections are slow. The International Energy Agency says building new transmission lines can take four to eight years in advanced economies, and wait times for transformers and cables have doubled in the past three years. It estimates that around 20% of planned data centre projects could be at risk of delays unless these risks are addressed.
Interconnection queues are long. Berkeley Lab's 2026 study counted about 8,200 projects, representing 1,312 GW of generation and about 749 GW of storage, actively seeking grid interconnection in the U.S. at the end of 2025. The median time from interconnection request to commercial operation was over five years for projects built in 2025.
The loads are very large. The IEA says a typical AI-focused data centre uses as much electricity as 100,000 households, and the largest under construction will use 20 times as much. See data center power requirements for the detail.
Ways to run behind the meter
There is no single BTM design. The common configurations are:
- Island mode. The site runs fully on its own generation, with no grid import.
- Grid-parallel. On-site generation runs alongside a grid connection. The grid can cover shortfalls, and in some markets surplus can be exported.
- Bridge, then grid. On-site generation serves the site until a grid connection is complete, then switches to backup or a reduced role.
- Bridge, then permanent on-site supply. On-site generation serves the site now and is later joined or replaced by long-term on-site generation, such as reactors.
The trade-offs
Behind-the-meter power solves the speed problem but brings its own responsibilities:
- Reliability is yours. Without a strong grid tie, the site needs enough redundant units to ride through outages and maintenance.
- Fuel logistics. Thermal BTM plants need secure gas supply or on-site liquid fuel storage.
- Permitting. On-site generation needs air, noise and land-use permits, and planning for emissions.
- Operations. Someone has to run, maintain and staff the plant around the clock.
Can nuclear be behind the meter?
In principle, yes. A reactor can be co-located with a large load and serve it directly, which is part of why small modular reactors and microreactors attract data-centre interest. See nuclear power for data centers. Co-location does not reduce the nuclear licensing burden. The reactor still needs a licence, an approved site and fuel.
How BridgePower Nuclear uses behind-the-meter power
BridgePower Nuclear, a joint venture of USP&E and BAM Energy, is built around the bridge-then-permanent model on one site.
First, thermal power. USP&E supplies thermal power on gas, diesel, HFO or dual-fuel, grid-tied or behind the meter. It is backed by 24+ years in power, 150+ power projects in 45+ countries, 2,000+ MW in stock and 400+ engineers and project managers.
One contract and one operator cover both phases, so the site does not have to change providers when nuclear arrives.
To discuss a behind-the-meter plan for your site, contact our team.
Frequently asked questions
What does behind the meter mean?
Behind the meter (BTM) describes generation or storage connected on the customer's side of the utility meter. The power it makes is used on site without passing through the meter.
What is the difference between behind the meter and front of the meter?
Front-of-the-meter assets are utility-scale plants connected to the transmission or distribution grid that sell into the wider system. Behind-the-meter assets sit on the customer's side of the meter and serve that customer's own load first.
Why do data centers use behind-the-meter power?
Mainly speed and certainty. Grid connections and new transmission can take years. On-site generation lets a facility energise sooner, and it also provides resilience if the grid is disturbed.
Can behind-the-meter generation still connect to the grid?
Yes. Many BTM systems run in parallel with the grid, importing or exporting under the utility's rules. Others run as an isolated island. The arrangement depends on local regulation and the interconnection agreement.
Can a nuclear reactor be behind the meter?
In principle a reactor can be co-located with a large load and serve it directly. It still needs a full nuclear licence, and any grid connection must meet the local grid operator's rules.