Water/Energy Nexus Programs
One of the state’s largest end uses of electricity is in the treatment, heating, and conveyance of water in California. This is known to many as the “Water/Energy Nexus.” The IOUs currently offer many incentive programs in the areas of energy efficiency, demand response, and distributed generation related to the water/energy nexus.
The CPUC authorized a series of pilot programs exploring whether energy savings may be realized through water conservation measures. Implicit in this approach is the concept that saving water saves energy. The Energy Division is currently analyzing whether an increase in energy efficiency portfolio emphasis on measures that maximize energy savings in the water sector – such as through leak loss detection and enhancement of water systems efficiency – may be warranted. The Energy Division is also currently considering how cost effectiveness should be analyzed for water/energy nexus programs.
A core aspect of the CPUC’s work on the Water/Energy Nexus is the Water-Energy Calculator (W-E Calculator). The first version of the W-E Calculator was released in 2016. In December 2021, the CPUC released the significantly updated W-E Calculator 2.0. Like its predecessor, the W-E Calculator 2.0 estimates the embedded energy savings (in kWh) of water-efficiency measures. However, while the previous calculator also estimated the avoided embedded energy cost and the avoided water-capacity cost, all cost-effectiveness functions have been removed from the W-E Calculator 2.0 and are now calculated in the CPUC’s Cost Effectiveness Tool (CET).
- W-E Calculator 2.0
- Old versions of W-E Calculator
R.13-12-011 grants the Petition for Rulemaking of the Division of Ratepayer Advocates requesting that the Commission open a Rulemaking proceeding to develop a partnership framework between investor owned energy utilities and the water sector to co-fund programs that reduce energy consumption by the water sector in supplying, conveying, treating, and distributing water.
R.13-12-011 now has 4 tracks focused on implementation of D.15-09-011. They are listed below, along with related documents.
Track 1: AMI Utilization in Water and Energy Savings
On January 19, 2016, a workshop was held on the topic of water and energy agency pilots to utilize the use of Advance Metering Infrastructure to maximize water and energy savings. Presentations are below.
- Pacific Gas and Electric
- San Diego Gas and Electric
- Southern California Edison
- Southern California Gas Company
- Workshop Video
Track 2: Matinee Pricing Tariff Pilots
On February 24, 2016, a workshop was held on the topic of matinee pricing. Presentations are below.
- Pacific Gas and Electric
- Southern California Edison
- San Diego Gas and Electric
- California Large Energy Consumers Association
Track 3: Water Energy Cost Effectiveness Calculator 2.0
- On April 6, 2016, a workshop was held to discuss potential updates to the Water-Energy Cost Effectiveness Calculator. Presentations are below.
Track 4: Water / Energy /Telecommunications Nexus
Water Energy Communications Workshop at CalOES – telecommunications to better manage water and energy, ensure public safety and enhance fire safety in the State of California
- None at this time
- On October 8, 2020 a stakeholder webinar was held to present the draft Water-Energy Calculator 2.0 (W-E Calc. 2.0), and to provide a demo of this new tool. The presentation also kicked off a 1-month stakeholder beta testing period for the W-E Calc. 2.0 See below links for a full recording of the meeting, a copy of slides presented, as well as the draft W-E Calc. 2.0 and user guide.
- On March 3rd, 2020 a workshop was held to share the draft WEN Workplan and solicit stakeholder feedback. Stakeholders were invited to make comments or ask questions during the meeting, and there was an opportunity for informal written comment submission after the workshop as well.
- On May 4, 2015 a workshop was held on the topic of cost allocation. The panelists’ presentations are available at the links below. The panelists were:
- Commissioner Sandoval’s April 27, 2015 Amended Scoping Memorandum and Ruling is available through the link provided below: http://docs.cpuc.ca.gov/SearchRes.aspx?docformat=ALL&docid=151339864
- All Party Workshop, February 11, 2015, 10:00 am-4:00 pm Water/Energy Nexus R. 13-12-011. Discussion of Proposed Cost Calculator to Identify the Water/Energy Nexus
- This All Party Workshop will facilitate discussion among parties on the topic of the Water/Energy Nexus Proposed Cost Calculator. There will be a presentation on the Proposed Water/Energy Nexus Cost Calculator. A link to the slides is provided here: CPUC Water-Energy CE - February Workshop Slides.
- The Energy Division hosted a public workshop on Water-Energy cost-effectiveness calculator on October 14, 2014, from 10:00 am to 4:00 pm in the Commission’s Auditorium. The purpose of this workshop will be to present a proposal on the cost-effectiveness calculator. This workshop follows up on the project work discussed at the January, April, and July 2014 workshops. Those wishing to gain more familiarity with this work are encouraged to review materials from the earlier workshops. The prior material can be found below the workshop details. The workshop Agenda and materials can be found at these links.
- Below is a link to Administrative Law Judge Edmister’ s Ruling Seeking Post-Workshop Comments on April 25, 2014 Proposal for Determination of Marginal Water Supply for Use in Embedded Energy Cost Calculator.
- The Energy Division hosted a public workshop on Water-Energy avoided cost of marginal water supplies on July 1, 2014, from 9:00 am to 12:00 pm in the Commission’s Courtyard Room. The purpose of this workshop will be to present a staff proposal on avoided cost calculation methodology and tools. This workshop follows up on the project work discussed at the January and April 2014 workshops. Those wishing to gain more familiarity with this work are encouraged to review materials from the earlier workshops. The draft workshop Agenda and Presentation can be found at these links.
- The Energy Division will be hosting a public workshop on Water-Energy marginal water supply and avoided costs on April 25. The purpose of this workshop will be to present a staff proposal on marginal supply and preview the avoided cost calculations methodology and tools. This workshop follows up on the project work discussed at the January 30, 2014 workshop. Those wishing to gain more familiarity with this work are encouraged to review materials from the earlier workshops.
- The Energy Division will be hosting a public workshop on Water-Energy Cost Effectiveness on January 30th. The purpose of this workshop will be to present an overview of the Water-Energy Cost-Effectiveness project being conducted for the CPUC by Navigant Consulting in 2014. This project is a result of the Cost Effectiveness Framework proposed by Staff at the Water-Energy public workshop in March 2013. Those who are unfamiliar with this work are encouraged to review materials from the March 2013 workshop.
- Final Presentations:
- Summary of Water-Energy Project Coordination Group Discussions
- The Energy Division hosted a workshop on programs and cost-effectiveness related to the Water/Energy Nexus on March 20-21, 2013, at the CPUC in San Francisco. These workshops were held in response to the most recent Energy Efficiency Guidance Decision, 12-05-015, which gave direction on programs related to the Water/Energy nexus.
- Workshop Agenda
- Staff Proposal for a Water/Energy Cost Effectiveness Framework
- Workshop Presentations:
- Navigant CPUC Embedded Energy in Water Studies
- E3 Water-Energy Avoided Cost Framework
- SCE Pioneering Partnership
- Cost-effectiveness Calculations for Water Savings Measures and Program in the IOU Energy Efficiency Portfolios: Added Considerations for “Embedded” Energy Savings and Delivering a Program in Partnership with a Water Agency
- PG&E’s Water/Energy Nexus Approach
- Water/Energy Relationship at SDG&E
- SCE Eastern Municipal Water District Integrated Demand Side Management Case Study
- Overview of the CPUC’s Customer Generation Programs
- SoCalGas Water—Energy Nexus
- EBMUD Water/Energy Nexus Strategies
Water Energy Programs:
- PG&E: Water/Wastewater Programs (offered through industrial sector)
- PG&E: Third Party Program for Wastewater Process Optimization (CalPOP)
- SCE: Business Solutions for the Water & Wastewater Industry
- SCE: Joint Customer Outreach & Education on Saving Water and Energy
- SoCalGas: Rebates & Incentives for the Water Supply and Treatment Facilities
- SDG&E: Partnership with San Diego County Water Authority
Embedded Energy in Water Studies and Pilots:
The Commission directed the IOUs to partner with water agencies and implement programs to decrease the amount of energy used to obtain, treat and distribute water to end-use customers. Read Water Studies 1, 2 and 3 and the Embedded Energy in Water Pilot Programs Impact Evaluation.