The Macro Grid Initiative seeks to expand and upgrade the nation’s transmission network to deliver job growth and economic development, a cleaner environment, and lower costs for consumers. The 15 states between the Rockies and Mississippi account for 88 percent of the nation’s wind technical potential and 56 percent of solar technical potential. However, this region is home to only 30 percent of expected 2050 electricity demand.
Through a transmission Macro Grid, we can connect centers of high renewable resources with centers of high electric demand, enhance grid resiliency and dramatically reduce carbon emissions.
Expanded and upgraded interregional transmission lines would help electric utilities, corporate and institutional buyers, and other consumers meet carbon and clean energy goals by affordably and reliably integrating low-cost renewable resources. Enhanced transmission will also facilitate increased electrification and ensure grid reliability in the face of new patterns of electricity demand.
Increased transmission development at the “seams” between regions could save consumers up to $47 billion annually and return more than $2.50 for every dollar invested.
A nationwide, high-voltage direct current (HVDC) network, optimized for the nation’s best wind and solar resources, could deliver 80 percent carbon emission reductions from the grid by 2030 without adding costs to consumers’ electric bills.
Increased transmission development at the “seams” between regions could save consumers up to $47 billion annually
America’s centers of high renewable resources and high electric demand, represented here through resource type and population size respectively, sometimes fall within different grid regions.
Stitching together the major regions of the power system, represented here conceptually, would allow the U.S. to harness its abundant renewable resources and balance electric demand across the country.
Upgrading America’s transmission system by building a Macro Grid is a cost-effective way to alleviate transmission congestion and allow the integration of new renewable energy, which is expanding rapidly due to competitive prices, corporate procurement goals and state renewable energy standards. The Macro Grid Initiative seeks to build public and policymaker support for a new policy and regulatory environment that recognizes the substantial nationwide benefits of new regional and interregional transmission. Priority areas include:
The next round of regional and interregional transmission planning
A fully planned and integrated nationwide transmission system
A new Federal Energy Regulatory Commission transmission planning rule
Grid Vision provides three key policy recommendations for realizing the benefits of an expanded transmission system. These three recommendations are centered around the “Three Ps” of Planning, Paying and Permitting, which call for forward-thinking and collaborative transmission planning, broad transmission cost allocation to reflect the broadly distributed benefits of transmission, and the simplification of interstate transmission line siting, respectively. Grid Vision concludes that expanding the current transmission system network could save consumers as much as $47 billion annually, a roughly 10 percent reduction in electric bills.
The National Renewable Energy Laboratory (NREL) conducted the Interconnections Seam Study to analyze the costs and benefits of optimized nationwide transmission expansion. NREL analyzed several study scenarios aimed at connecting the nation’s main grid regions. The scenarios included:
Each design scenario was run under two separate policy cases – the current policy case (assumes existing renewable portfolio standards as of 2017) and the carbon pricing case (carbon pricing that grows at a rate of $3/metric ton of CO2 per year to reach $40/metric ton by 2038). The report shows the benefit-to-cost ratio under the current policy case for designs 2a, 2b, and 3 are estimated to be 1.26, 1.13, and 1.15, respectively, per $1 invested over a 15-year period. Under the carbon pricing case, the benefit-to-cost ratio for designs 2a, 2b, and 3 are estimated to be 2.48, 3.3, and 2.52, respectively, per $1 invested over a 15-year period. Additionally, the study found annual production cost savings to range from $0.8 billion to $2.5 billion over a 15-year period under the current policy case and from $1.9 billion to $3.8 billion over a 15-year period under the carbon pricing case.
Informing the Transmission Discussion offers an overview of the challenges each US region faces as a result of changing energy mixes, increases in electrification, increases in demand-side variability from DERs and energy storage and the need for location-constrained renewables. The study looks at the current regional transmission landscape and examines what must be done to address these challenges, finding that transmission is a critical solution for meeting both clean energy and resilience objectives. Informing the Transmission Discussion also details how the electrification of buildings and vehicles will increase demand for electricity supply and renewable resources, with an estimated $7 to $25 billion in transmission investment needed by 2031 to meet these needs.
Future Cost-Competitive Electricity Systems and Their Impact on US CO2 Emissions, funded by the National Oceanic and Atmospheric Administration and published in the Nature Climate Change journal, models the benefits of constructing a nationwide HVDC transmission network designed to tap into renewable and other low-carbon resources geographically dispersed throughout the country. Under such a network design, approximately 60 percent of U.S. power sector electricity could be generated from wind and solar resources alone. The study analyzes the emission reduction potential of the transmission network shown above under three scenarios:
With new HVDC lines to access resources more efficiently, the HRLG, MRMG and LRHG scenarios are expected to reduce power sector emissions by 33 percent, 61 percent, and 78 percent, respectively, compared to 1990 levels. Additionally, consumers are expected to save as much as $4.7 billion annually under the LRHG scenario, which is roughly the equivalent of a 10 percent reduction in electric bills or roughly three times the cost of the HVDC transmission builds per year.
Minnesota’s Smarter Grid, a study performed by Vibrant Clean Energy, models eight future Eastern Interconnection electric system scenarios to determine the optimal pathways through which Minnesota can meet its state goal of decarbonizing its economy 80 percent from 2005 levels by 2050 (80×50). A more flexible grid with increased interstate transmission can efficiently support the large amount of renewable resources needed to meet decarbonization goals while providing service at costs lower than current costs and costs incurred through a lack of interstate transmission. The study finds that scenarios with interstate transmission expansion can introduce annual savings to Minnesota consumers of up to $2.8 billion, with an annual savings for Minnesotan households of up to $1,165 per year.
New Jersey’s Integrated Energy Plan, commissioned by the state’s Board of Public Utilities and based on analysis by the Rocky Mountain Institute, finds that existing New Jersey policies will not be sufficient to meet the state’s clean energy goals. Modeling of the least-cost pathways to meet these goals finds that PJM-to-New Jersey transmission will need to be increased from 7 to 9 gigawatts in order to achieve the state’s 100 percent carbon-neutral by 2050 target. This enhanced transmission capacity will allow New Jersey to cost-effectively import electricity from new out-of-state wind and solar plants.
