A battery had the following activity derived from hourly meter data.
Consumed charging energy (MWh)
5,000
Injected discharging energy (MWh)
4,250
Round-trip efficiency
85%
Assess the Impact of Charging Activity
Using the GRF emissions source hierarchy, REsurety was chosen as the emissions data provider.
Hours of charging
Volume of Energy (MWh)
Hour
MWh
Average MER (tCO2/MWh)
Total Carbon Impact (tCO2)
1
0
0
2
0
0
3
0
0
4
0
0
5
0
0
6
200
0.15
30
7
1000
0.25
250
8
2000
0.2
400
9
1100
0.1
110
10
700
0.3
210
11
0
0
12
0
0
13
0
0
14
0
0
15
0
0
16
0
0
17
0
0
18
0
0
19
0
0
20
0
0
21
0
0
22
0
0
23
0
0
24
0
0
Average charging MER (tCO2/MWh)
0.20
Total charging carbon impact (tCO2)
1,000
Consumed charging energy (MWh)
5,000
Neutralize Charging Impact (Hourly-Matching)
GCs are retired to match hours of charging and sourced from the same balance authority, complying with the EnergyTag Standard.
Retired GCs
5000
Retired GC Average MER (tCO2/MWh)
0.18
Percent hourly-matched
100%
Carbon Impact of Retired GCs (tCO2)
-900
Remaining charging carbon impact (tCO2)
1,000 – 900 = 100
Percent emissions-matched
90%
Submit Project Data for Verification and GC Issuance
The GC registry verifies the meter data, emissions data, and retired GCs. Upon completion, a GC Matching Report will be created along with the issued GCs.
Average discharging MER (tCO2/MWh)
0.45
Gross discharge carbon impact (tCO2)
4,250 * 0.45 = -1,912.5
Adjusted discharge carbon impact (tCO2)
-1,912.5 + 100 = -1,812.5
Issued GCs
4,250
Issued GC Average MER (tCO2/MWh)
0.43
Contract Settlement
Settling the GC agreement using a predetermined carbon price.
Issued GCs Sales Revenue
$181,250
Retired GC Cost
-$90,000
Net Profit
$91,250
Carbon Accounting
This battery has converted 5,000 low-impact GCs into 4,250 high-impact GCs by shifting the hours of CFE generation. Adding a ‘virtual hybrid’ to low-impact PPAs will fill gaps in 24/7 PPAs.
