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The report examines the deep links between California's water and energy sectors, noting that water services account for approximately 20% of electricity and 30% of natural gas consumption, while hydropower provides an average of 15% of electricity. Using WEAP and LEAP modeling, the study finds that water conservation and potable reuse can reduce energy demands and costs, whereas desalination increases them. To achieve carbon neutrality by 2045, the report emphasizes the necessity of massive growth in solar, wind, and energy storage, alongside the continued role of low-cost hydropower. It also warns that federal policy interference could increase electricity production costs by $23 billion and raise CO2 emissions by 16% compared to the state's policy baseline.

The report outlines a 'Reinventing Fire' scenario for China to decouple economic growth from energy consumption and carbon emissions by 2050. By prioritizing demand reduction, electrification, and a shift to non-fossil energy, China could maintain GDP growth while reducing primary energy demand to 2010 levels. Key strategies include structural industrial shifts, passive building design, multimodal transportation optimization, and a three-stage transition of the power sector from coal to renewables. The analysis suggests this transition is cost-effective, with a potential net present value savings of 21 trillion RMB.

The document argues that the 'nexus' of water, energy, and climate requires integrated modeling tools to avoid unwanted policy consequences. To address this, the Stockholm Environment Institute (SEI) linked its WEAP and LEAP systems. A California case study simulating the use of desalinated seawater to meet 5% of Southern California's urban water demand by 2049 found that while desalination could reduce water imports by approximately 300 million cubic meters per year in normal years, it would increase the water sector's electricity use by about 3 terawatt-hours and greenhouse gas emissions by 1.4 million tonnes of CO2e per year by 2049.

This policy brief by the Stockholm Environment Institute describes the application of an integrated water-energy-food-ecosystems (WEFE) nexus modeling approach (LEAP-WEAP-MACRO) to the Syr Darya River Basin. It argues that integrated modeling provides more realistic results than siloed approaches and demonstrates that international cooperation among Central Asian countries can increase water availability, boost agricultural production, and reduce greenhouse gas emissions compared to business-as-usual scenarios.

The report details the creation of a comprehensive modeling framework for the Syr Darya River Basin, integrating the Water Evaluation and Planning (WEAP) platform, the Low Emissions Analysis Platform (LEAP) with the Next Energy Modeling system for Optimization (NEMO), and a macroeconomic model (Macro). This integrated approach allows for the simulation of complex interdependencies between water availability, energy production, and economic outcomes across Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan. The study evaluates six thematic narratives—ranging from business-as-usual to regional cooperation and ecosystem restoration—under four climate projections (Historical, Dry, Average, and Wet). Key findings indicate that pursuing isolated national interests increases water stress, while regional cooperation and efficiency policies significantly reduce unmet irrigation demands, lower greenhouse gas emissions, and boost agricultural value added and GDP.