Presentation Details
| Updating PV and Battery Bill Savings Calculations for Net Billing: New Best Practices for Input Data and Uncertainty Brian Mirletz, Brittany Speetles, Janine Keith. National Laboratory of the Rockies, Golden, CO, USA |
Abstract
Jurisdictions are increasingly adopting compensation structures for distributed PV and PV-battery systems that price exported energy lower than energy consumed onsite (net billing rates). Standard methods for calculating the bill savings from PV and PV-battery systems were developed for net metering structures; however, applying these same methods to net billing structures (such as using Typical Meteorological Year weather with actual year load) introduces bias errors that underestimate PV-battery system bill avings by between 1.5% and 9%, depending on the utility rate. We assess the magnitude of these errors and compare them to other sources of uncertainty when estimating the bill savings from PV and PV plus battery systems under more complex utility rates.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.