TECH TIP: What is the DELTA EDR, and where to find it?

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DELTA EDR FOR CAHP 2017

The 2017 California Advanced Homes Program (CAHP) switches the program eligibility and incentive metric to the Delta Energy Design Rating (EDR). 

CAHP’s primary reason for shifting to the Delta EDR is to make program entry more equitable and to align better with the direction of the state in 2019. The Delta EDR is the difference between the ‘Standard Design EDR’ and the ‘Proposed Design EDR’. The current versions of CBECC-Res and EnergyPro generate multiple versions of the EDR. Below is a list of the five EDRs currently available.

The minimum requirement for entry in to the CAHP Single-family program is a Delta EDR score of 3 for all climate zones (CZ 1-16). Incentives are specific to the plan and orientation of each lot. A Delta EDR of 3 ensures a minimum incentive value of $300. The incentive amount increases incrementally with a point increase in the Delta EDR. For each point up-to a Delta EDR of 6, the incentive increases by $150 and a $300 increase for each point thereafter. Incentives can now be estimated using the CAHP 2017 Incentive Calculator. (Software integration expected by Q2 2017.)

The Delta EDR compares a home’s energy use to what that same home’s energy use would be if built to the prescriptive path. For an equitable entry across all climate zones, the Delta EDR also allows bonus performance embedded “Point Kickers” that can add to the Delta EDR points for incentive calculation.

POINT KICKERS

These are non-modeled energy savings that are awarded with EDR point reductions and are dependent on the climate zone that the home is being built in. Due to more extreme climate, inland homes are more intensive in terms of heating and cooling energy usage which makes it easier to achieve higher Delta EDRs. Climate Zones 1, 2 and 9 through 15 are categorized as Inland Climate Zones, whereas Climate Zones 3 through 8, and 16 fall under the Coastal Climate Zone category.

Point kickers: CAHP 2017 allows point kickers for LED lighting and Home Energy Management Systems (HEMS), for which the energy models don’t give credit.

WHERE TO FIND DELTA EDR?

The EDR required for incentive calculation can be generated by using 2016 Title 24 energy modeling software programs CBECC-RES 2016 (2.0 and 2.1) and EnergyPro 7 (7.1).

CBECC-Res 2016:  

To generate EDR in CBECC-RES 2016, versions 2016.2.0 (857) and 2016.2.1 (868):

  • Open the project in CBECC-Res 2016 and open the Project tab at the top of the building tree
  • Under the Energy Design Rating tab, check the ‘Detailed Energy Design Rating Inputs’
  • Run the simulation
  • Look for EDR tab in the Review Analysis Results box, or the second or third page of the CF-1R.

EnergyPro 7.1:

  • Open the project in EnergyPro7 and run the simulation
  • The EDR results show up on the Res T24 Performance Table

Note: The ‘Proposed EDR’ in the Res T24 Performance Table shows the Final Proposed EDR with PV credit. If the model includes PV, do not refer to the Res T24 performance table, but look for EDR of Standard design and EDR of Proposed Design in the second or third page of the CF1-R.

View the 2017 CAHP Orientation Update Webinar to learn more about these changes, as well as a new updated incentive kickers.