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As part of the U.S. SunShot Initiative—aiming to make PV electricity cost-competitive with conventional generation by 2020—this report analyzes the impact of high-penetration variable generation on the distribution grid, it demonstrates that in most cases DG can be safely integrated at much higher levels than interconnection standards allow. By streamlining interconnection processes, deploying advanced inverter functionalities, and coordinating DGPV, upwards of 350 GW can be hosted on the U.S. grid with little additional hardware. The report also outlines challenges to interconnection such as voltage regulation, power flow, and protection issues. It then studies the role of storage and complementary technologies to overcome reliability constraints. This research is applicable outside of the U.S. in demonstrating how to maximize an existing grid for DG.
Located in Topics & Resources / Grid Planning, Integration, & Operations / Grid Planning, Integration, & Operations folder
This report examines the broader role of hydropower in the U.S. power system in terms of both energy and ancillary services, and how these roles vary across regions, especially under the context of greater variable RE. The report looks at the drivers and barriers to hydropower generation within these markets.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
The report includes both a broader look at the European hydropower market as well as detailed flexibility case studies in the Nordic power system, Austria, Poland, Norway, Germany, Switzerland and Ireland.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
This document explores the benefits of expanding co-optimization of energy and ancillary services to hydropower. The author builds off of practices currently enacted for conventional generators and demonstrates that co-optimization improves the economics of hydropower plants.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
This report summarizes a three-year, U.S. Department of Energy commissioned study that assesses the value of hydropower to the U.S. power system for both pumped and traditional plants. The report includes an assessment of the current market structures and costs and ways to increase the value of hydropower.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
Standard IEEE 1547 is an example of an interconnection standard (commonly used in North American power systems) providing technical rules for interconnecting distributed generation resources with the electric grid. The standard’s guide introduces the background and rationale for the technical requirements, facilitates use of the standard by characterizing distributed resource technologies and related interconnection issues, and provides approaches and information to support interconnection and implementation. The standard was updated in 2014 with an amendment providing existing information on voltage, voltage regulation, and frequency.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
To enable distributed PV that can supply electricity during grid outages, this paper presents approaches specifically to support resiliency through design of PV systems utilizing storage technologies, community energy storage, solar-diesel hybrid systems, and micro-grids. The paper also considers policies and regulations to support distributed PV that contributes to resiliency.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
This report estimates the storage required to enable PV penetration up to 50% in California (with renewable penetration over 66%), and quantifies the complex relationships among storage, PV penetration, grid flexibility, and PV costs due to increased curtailment. The authors find that storage needs depend strongly on the amount of other flexibility resources deployed. With very low-cost PV (three cents per kilowatt-hour) and a highly flexible electric power system, about 19 gigawatts of energy storage could enable 50% PV penetration with a marginal net PV levelized cost of energy (LCOE) comparable to the variable costs of future combined-cycle gas generators under carbon constraints.
Located in Topics & Resources / Demand Response and Storage / Demand Response and Storage Folder
This case study is based on interviews with PG&E (a California utility) and explores the institutional circumstances surrounding the implementation of PG&E’s SmartRate™ dynamic rate program. The case study focuses on implementation and procedural challenges, reactions and perceptions of stakeholders involved, and lessons learned. The case study is not intended to evaluate the program but offers insight into the internal workings, attitudes, and relationships of a utility successfully implementing a demand response program.
Located in Topics & Resources / Demand Response and Storage / Demand Response and Storage Folder
This report details the barriers that restrict the deployment of energy storage technologies in the United States. The findings are based on interviews with stakeholders and review of regulatory filings in four regions roughly representative of the country. The report suggests that while high capital costs remain a barrier to energy storage, deployment is also impacted by regulatory, market (economic), utility and developer business model, cross-cutting, and technology barriers.
Located in Topics & Resources / Demand Response and Storage / Demand Response and Storage Folder
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