This group brings together the best thinkers on energy and climate. Join us for smart, insightful posts and conversations about where the energy industry is and where it is going.


The Holistic, Integrated, and Flexible Approach to Distributed Energy and the Digitalization of our Electric Grid

Sonita Lontoh's picture
(Formerly) Vice President of Marketing, Siemens Digital Grid

Sonita Lontoh is Vice President of Strategic Marketing at Siemens Digital Grid. She is a technology executive focusing on the Internet of Things (IoT), 'Smart' Connected Energy/Devices and Green...

  • Member since 2016
  • 13 items added with 11,962 views
  • Mar 14, 2017


I participated on a panel last week that discussed, among other things, how we can effectively manage and optimize Distributed Energy Resources (DER) from a technology and solutions perspective. While technology and solutions are important, I believe we need a more holistic, integrated, and flexible approach to DER which incorporates technology, new business models, and policy; and provides the framework for evaluation from a physical, economic, and information/data lenses.

As we enter the 21st century, we recognize that our energy system will become more and more distributed and customer-centric. Our utilities will evolve from being an energy provider to becoming an energy integrator to eventually becoming an energy orchestrator/full energy services provider. This evolution will be a journey and there is no one-size-fits-all when it comes to where they start or end the journey, as each utility has different regulatory environment, territories, business drivers and priorities. For some, the focus is first resiliency, while for others, it is customer choice or greenhouse gas emissions reductions. Wherever they start or end their journeys, however, it is important for them to be able to evolve while still providing safe, reliable, clean, and affordable energy to their customers.

In the face of this evolution, how should the different industry stakeholders – utilities, ISOs, regulators, policy makers, customers (both residential and Commercials & Industrials), and technology/solutions providers approach this phenomenon successfully? What should be done – from a technology, business model, and policy perspective – to ensure success? What can be done to streamline and speed up the adoption of DERs while still ensuring a safe, reliable and affordable energy system for all?

Before I delve deeper on the holistic framework, let’s get on the same page in terms of the definition of DER. There are many definitions out there, and for the purpose of this article, I view DER as any resource that produces electricity or reduces electricity consumption, and can be connected to the electrical grid, either “behind-the-meter” in the customer’s premise, or “in-front-of-the-meter” on the utility’s distribution system. As such, a DER can include, but not limited to, energy efficiency, demand response, microgrids, solar panels, energy storage, and electric vehicles.

Integrated Approach – Aligning Physics with Economics

One of the important aspects of the holistic, integrated and flexible approach to DER is integrated planning, as in looking at DER planning both from the transmission and distribution perspectives and how it may affect the two. From a physical perspective, the needs and requirements of integrating DERs on the transmission grids are different from those on the distribution grids. For example, in responding to aggregated demand response signals from the transmission grids, the distribution circuits need to ensure that their responses do not trigger dangerous voltage spikes that may de-stabilize the circuits. Similarly, when transmission operator responds to peak demand by calling on DERs, the distribution grids need to ensure that that power comes from a location that will not cause problems for the substations. As such, integrated planning allows us to model physical consequences of DER participations on the grid to be more coordinated and planned. It allows industry participants to have the tools and information needed on the locations of DERs and how they will most likely behave.

In addition to addressing the physical aspects of DER participations in the systems, we also need to align the economic and financial incentives. This will allow distributed resources to respond to economic signals from the transmission grids while optimizing their distribution grids benefits. Rewarding industry participants, which include utilities, customers and DER providers, for outcomes that maximize these values would optimize DER participations on the grids. For instance, we can align utilities’ financial incentives through performance-based regulations that link shareholders’ return to outcomes such as reliability, affordability, customer choice, convenience, and environmental impacts. Economic value of DERs can also be evaluated based on deferred investments in infrastructures due to DER participations on the grids.

Integrated Approach – Including DERs in Resource Planning

By integrating DERs into distribution planning, we take the holistic approach to meeting distribution needs while also enabling customer choice and unlocking the benefits of distributed energy. In the long run, this approach reduces overall system costs while providing customers with more choice, convenience and resiliency. Traditionally, distribution planning focuses on forecasting load growth, identifying infrastructure needs to meet this forecasted load growth, and planning for the solutions to be deployed to meet the needs. With DER penetration increasing, this traditional framework needs to be updated to proactively include DERs in the planning and to leverage its benefits. Instead of just forecasting load growth, integrated planning needs to also forecast DER growth. Instead of only focusing on what infrastructure is needed to meet this forecasted growth, integrated planning needs to leverage DER capabilities to provide grid services such as peak shifting, peaking capacity, ramping, voltage management, and power quality, which eventually improve grid resiliency and lower overall systems costs.

Additionally, integrated planning should also consider DER as a preferred resource. When I used to work at a regulated utility in California a few years back, the California energy agencies established a preferred resource “loading order” – energy efficiency, demand response, renewables, and distributed energy generation – to help develop and operate California’s electricity system in the best, long-term interest of consumers. This preferred loading order prioritizes energy efficiency and renewables ahead of fossil-fuel based generations, when it is in the long-term best interest for the consumers using the “least-cost, best-fit” framework. Similarly, we can employ a preferred resource “loading order” to prioritize distributed energy solutions that serve the long-term best interest of consumers for a cleaner, more sustainable, and more resilient energy system, while ensuring cost-effectiveness and reliability.

As the industry continues to embark on this journey, we should embrace this holistic, integrated and flexible approach to DER, where we would build a rich ecosystem that improves reliability and resiliency, empowers and engages customers, and provides a cleaner and more sustainable electric system.

Photo Credit: Ian Muttoo via Flickr

John Miller's picture
John Miller on Mar 15, 2017

The problem statement for substantially increasing ‘Distributed Energy Resources’ (DER) is due to the growing level of supply-demand variabilities’ and lack of full controllability’s of the current and future major sources of distributed green power supplies: wind & solar. Depending on the location of centralized/distributed micro-grids’ capacities, time-of-day, weather conditions, etc. as these intermediate, distributed power generation sources increase, so do the number and magnitude of the required power system reliabilities’ control variables.

Yes, the digitalization of the ‘transmission & distribution’ (T&D) power grids has and will continue to expand, but another factor rarely discussed is the possible impacts increasingly placed on most power systems’ consumer’s ‘on-demand’ controls’ capabilities. At some point if customers don’t have their own backup power, battery storage or local generator systems, ‘demand response’ could evolve into ‘distributed command-and-control’. Your future evolving ‘smart homes’ could require that you prioritize your power demand by individual appliances/devices, and, the Utility Companies could have direct-digital control over your homes’ total power usage/consumption; 24/7.

The feasibility and affordability of massively expanding DER, of course, depends on the improvements and development of needed technologies, T&D, etc. and distribution of the DER-to-consumer sources/locations within individual power grids.

Rick Engebretson's picture
Rick Engebretson on Mar 15, 2017

In the age of advanced automobile energy systems integration, it is long overdue asking why not other energy systems integration??

Why do we complain about gas electric generation efficiency heat loss, when we burn gas exclusively for heat (homes, businesses), and then purchase electricity from the grid, too?? Can’t we copy a car that generates heat, electricity, hydraulic pressure, air conditioning, and moves mass too?? A car uses virtually the same fuels, with advanced electronic controls, and some have toilets and refrigerators.

If we are going to reinvent all our energy infrastructure, why start with 10 different untested system theories that don’t fit together for integration??

I fully believe we old-time environmentalists are being treated like fools with political slop. People can still choose a car purchase, so car companies innovate and adapt; working options are staggering, and we seem able to share the highways.

on Mar 17, 2017

John, thank you for your insightful response. I agree with your assessments.

on Mar 17, 2017

Thank you for your response, Rick.

Sonita Lontoh's picture
Thank Sonita for the Post!
Energy Central contributors share their experience and insights for the benefit of other Members (like you). Please show them your appreciation by leaving a comment, 'liking' this post, or following this Member.
More posts from this member

Get Published - Build a Following

The Energy Central Power Industry Network® is based on one core idea - power industry professionals helping each other and advancing the industry by sharing and learning from each other.

If you have an experience or insight to share or have learned something from a conference or seminar, your peers and colleagues on Energy Central want to hear about it. It's also easy to share a link to an article you've liked or an industry resource that you think would be helpful.

                 Learn more about posting on Energy Central »