ASHRAE Building Standard 241 Targeting Infectious Aerosols to Improve the Air Quality of Indoor Environments

Editor’s note: The following post is written by guest blogger Dave Becattini, Vice President, LifeAire Systems. In September 2022, the Pennsylvania C-PACE program was expanded to include Indoor Air Quality (IAQ) as an eligible measure for C-PACE financing. This piece discusses an important new standard from ASHRAE related to IAQ. PEA is not endorsing or recommending LifeAire or its products.

ASHRAE released Standard 241, its first-ever standard for “Control of Infectious Aerosols.” This standard “establishes minimum requirements to reduce the risk of disease transmission by exposure to infectious aerosols in new buildings, existing buildings, and major renovations.”

The key driver for the development of Standard 241, according to Dr. Bill Banfleth, the Chairman of the ASHRAE committee that created the standard, was “discussion between ASHRAE and the White House COVID-19 Response Team about the need for new and better IAQ (indoor air quality) standards. ASHRAE was encouraged to take the lead in developing a new standard for control of airborne pathogens.” For those less familiar with ASHRAE guidelines, they aren’t mandates but they are generally accepted throughout the U.S. and Canada as the gold standard for HVAC.

This is a particularly important and welcome step forward; having ASHRAE’s recognition of certain key requirements for air cleaning technology, such as single pass pathogen remediation and rigorous third-party testing under conditions similar to where the devices will be used. Single pass means the remediation is virtually instantaneous. Pathogens are killed on the first pass through the HVAC system. Most technologies take 30 – 60 minutes to kill pathogens such as COVID 19 so they allow them to recirculate through the HVAC system multiple times therefore distributing them throughout a building. Single pass effectiveness and real-world testing are essential for ensuring a technology’s effectiveness in the field. And, full disclosure, these elements have been a cornerstone of my company, LifeAire Systems, since our founding over 10 years ago.

Standard 241 also establishes the concept of “Equivalent Clean Airflow” through filtration and/or air cleaners to purify the recirculating air within a facility. This reduces the need to bring in additional outside air which is very energy intensive and costly.

Also of note is the call for previously installed air cleaning systems to comply with the testing requirements of this standard after January 1, 2025. For many, this will prompt a re-examination of their air purification strategies and likely require changes or additions to achieve full compliance. This is welcome news for many facilities exploring how they can build on their existing IAQ strategies or implement a new one to reach the high air purity requirements of Standard 241 for both new and retrofit applications.

These new requirements with more focus on clean airflow are a welcome addition in the post-COVID pandemic era, where air quality and protection from the transmission of airborne diseases has moved into the mainstream and remains a high priority. LifeAire Systems applauds the efforts of ASHRAE in releasing this new standard and supports ASHRAE’s hope for the standard’s future role in helping to save lives and minimize disruption to society of airborne diseases.

About: LifeAire Systems has patented air purification technology. This high-performing technology is proven to effectively eliminate airborne chemical and biological pathogens in a single pass. For more information, please visit Dave Becattini can be contacted at

Building Energy Efficiency projects can generate significant revenue through Alternative Energy Credits in PA

Editor’s note: The following post by guest blogger Jason Campbell from Blue Delta Energy is an important read! I just learned about Tier II credits which are now similarly valued to Solar Renewable Energy Credits. This is a revenue stream that can be used for retrofits and new construction. Lisa Shulock

Pennsylvania’s Alternative Energy Portfolio Standard (AEPS) provides financial support for a range of clean energy projects, such as wind and solar, but also other sources including distributed generation, and a broad range of energy efficiency projects. Under the AEPS, energy efficiency projects qualify as a Tier II resource eligible to create operating incentives in the form of Alternative Energy Credits (AECs).  One AEC is equal to one MWh of electrical generation or energy savings. The Pennsylvania PUC defines energy efficiency projects to include lighting, HVAC, heat pump, efficient appliance, and demand response projects, to name a few. Depending on the specific project type, new construction, retrofits, and early replacement projects are eligible to qualify.

The AECs are valued on the compliance market as driven by demand from Pennsylvania’s load serving entities, who are required to include a specific percentage of electricity from alternative energy resources in the generation provided to Pennsylvania customers.  The value of the current market for Reporting Year 2024 Pennsylvania Tier II AECs is approximately $35 per MWh, yielding significant value for qualifying projects.  As an example, an energy efficiency project with annual electricity savings of 1,800,000 KWh generates 1,800 AECs per year. At $35 per AEC, the project could generate approximately $63,000 in annual revenue during its crediting period.

AECs are created monthly in a clean energy tracking registry. Importantly, the Pennsylvania PUC allows for AECs to be created and monetized in addition to the receipt of utility rebates.

Blue Delta Energy currently manages a diverse portfolio of Tier II AEC projects in Pennsylvania.  As a service provider, the company (1) works with clients, third-party engineers, and the PUC to get projects approved, (2) registers the AECs in the applicable registry, and (3) monetizes the credits in line with client goals. 

Jason Campbell can be contacted at

Palladium Group & Nuveen Green Capital close $7.5MM C-PACE deal

The Philadelphia Energy Authority, Nuveen Green Capital and TLSIC P3, LLC and Liberty Square P3, LLC closed on retroactive C-PACE financing for energy efficiency and water conservation measures installed during the construction of Phase III of Liberty Square, a mixed use multifamily and commercial property located at 1214 & 1252 N. American Street. Fact sheets for this project and all PA C-PACE projects can be found here

Liberty Square is located in the Northern Liberties neighborhood of Philadelphia. The project construction was completed in 2022. C-PACE financing for this new construction building was used for energy and water efficiency improvements. Energy modeling shows it is expected to be 23% more energy efficient than required by Philadelphia’s building energy code. The owners, managed by Palladium Group, borrowed $7,500,000 in C-PACE financing from Nuveen Green Capital to fund the energy and water efficiency improvements.

Interested in learning more about C-PACE? Contact us at and/or attend our C-PACE Open Meetings which take place on the last Thursday of each month from 2:00-3:00PM. See all C-PACE Philadelphia events here.

Philadelphia C-PACE Program Guidelines Updates

Philadelphia C-PACE Program Guidelines have been revised effective August 15, 2023. The Program Guidelines and all program resources can be found on the Program Resources page of our website.

Key changes to the Guidelines are outlined in the Comparison of Program Guidelines  document and listed below:

  1. September 2022 Addendum integrated into main body of Program Guidelines which contained guidance on implementation of Multifamily properties (5+ units) and IAQ and Resiliency Measures
  1. Retroactive Guidelines for Multifamily, IAQ and Resiliency Measures updated to allow up to two-year retroactive period
    1. Complete Final Application must be submitted within 730 days after the completion of the installation/construction as proven by the date on the Certificate of Occupancy or other acceptable construction completion documentation
  2. Clarification on when C-PACE financing term must begin
    1. The first year of the maximum allowed term (as defined by weighted average useful life (WAUL)) must begin in the first eligible billing year and cannot exceed the lesser of (i) the WAUL or (ii) 30 years
  1. Closing related fees updated
    1. Department of Records and Department of Judicial Records fees updated to reflect City fee increases 
    2. Added Program Administrator notary fee of $30
  1. Certified Indoor Air Quality Professional (CIAQP) added as IAQ qualified professional credential

This update is for the Philadelphia program only.  If you have a project in another PA county, please contact the SEF team at regarding that county’s program guidelines. 
Questions for the Philadelphia C-PACE team can be sent to

New PECO Incentive for Commercial Solar

Combined with IRA benefits, commercial solar costs are reduced at least 35-40%.

In June, PECO launched a new solar energy incentive for commercial property owners. This incentive is part of its Act 129 program which incentivizes reduction in electricity use. In this case, the incentive is for production of “behind-the-meter” solar energy. The program provides $0.10 per kWh of energy generated based on the property’s first year of annual solar production, minus any excess kWh that is greater than the kWh demand in the same period. In other words, PECO will provide an incentive on the kWh that commercial properties produce and consume.

We estimate that this incentive will reimburse property owners between 4 -10% of a typical total solar system’s cost, though it will be at least six months before there is actual data from PECO to confirm our estimates. 

This PECO reimbursement, combined with the IRA’s expanded Investment Tax Credit (or Elective Pay for non-tax paying entities) of at least 30%, brings the total cost of commercial solar projects down by 35-40% or more. (More information about the federal tax benefits can be found here).

We looked at two projects recently completed by our Solarize partner, Solar States, to understand the likely benefit this new incentive will provide to these projects. 

Small Scale Solar Project

A small higher education institution outside of Philadelphia recently installed solar panels to power an energy efficiency system within the HVAC system in one of their academic buildings. Solar States estimated that their solar system will generate 14,042 kWh of electricity annually.

System Specs

Solar System Generation (kWh)Total Cost of System ($)System Size (kW)

The university can take advantage of this new incentive from PECO on the solar energy they use, but not on excess electricity that is sent back to the grid. So, if they annually use 12,000 kWh (Scenario 1), they would receive $1,200 from the $0.10 per kWh incentive. They would not receive the incentive on the 2,042 kWh that was sent to the grid in excess. In Scenarios 2 & 3 they would receive $0.10/kWh for all solar generation.

Incentive Earned 

Scenario Electricity Demand (kWh)Excess Electricity
(Solar System Generation – Electricity Demand) (kWh) 
Incentive Earned ($)Percent Cost Reduced by Incentive 

Medium Scale Solar Project

An early childhood education center  will likely receive approximately $32,000 from PECO. The center installed a solar project which Solar States projects to generate 319,400 kWh of electricity annually. 

System Specs

Solar System Generation (kWh) Total Cost of System ($)System Size (kW)

If their energy demand is only 300,000 kWh (Scenario 1), the center would receive $30,000 from the incentive. The excess 19,400 kWh of electricity would be fed back to the grid and the center would not receive the incentive on this energy. In Scenarios 2 & 3 they would receive $0.10/kWh for all solar generation.

Incentive Earned 

Scenario Electricity Demand (kWh)Excess Electricity (Solar System Generation – Electricity Demand) (kWh) Incentive Earned ($)Percent Cost Reduced by Incentive 

As a result of this incentive, commercial property owners can expect to save money on annual electricity costs, shorten payback periods for solar installation, increase property value, and boost their reputation with their business’s commitment to sustainability. 

Have questions about solar for your property? Please email us at

RFP released for C-PACE Engineering Services

On July 10, 2023, the Philadelphia Energy Authority issued a Request for Proposals (“RFP”) to solicit pricing proposals for technical assistance to support Philadelphia Energy Authority’s (“PEA”)  administration of the Commercial Property-Assessed Clean Energy (“C-PACE”) which includes reviewing certain C-PACE surveys (commercial building improvements for energy efficiency or renewable energy, water conservation, resiliency and/or indoor air quality) and advising PEA about whether they are compliant with C-PACE Program requirements.  Firms may bid to review one or more of the following survey types:

  • Energy and water, including Energy Reliability Improvement
  • Indoor Air Quality (IAQ)


  • Resiliency (ability of the building to withstand damage from wind, precipitation, flooding, fire, and earthquakes)

All questions regarding this RFP must be submitted by email to with the subject line “Questions – C-PACE Engineering RFP”. No questions will be considered by phone.

Responses to questions received before 5pm on July 20, 2023 will be posted on the RFP page on the PEA website ( Respondents are urged to check the website for the responses to the questions. All responses will be issued by July 26, 2023. Oral responses by any PEA employee or agent of PEA are not binding and shall not in any way be considered as a commitment by PEA. 

Respondents to this RFP must submit an electronic version of all requested documents by email to with the subject “C-PACE Engineering RFP Response – [Firm Name]” no later than 5pm on August 9, 2023. Responses received after the deadline will not be considered. 

Link to RFP

Retroactive guidelines to change in August

Multifamily Retroactive Program Guidelines Revision

Program Guidelines for C-PACE in Philadelphia and the rest of Pennsylvania counties were updated in September of 2022, incorporating the expansion of C-PACE which included eligibility for multifamily rental properties of 5 or more units as well as resiliency and Indoor Air Quality measures. 

The Program Guidelines issued then and currently in effect in Philadelphia limit retroactive financing as follows:

“Retroactive C-PACE financings for building types and measures made newly eligible through Act 43 must occur after September 6, 2022 (60 days after the Pennsylvania C-PACE Statute was enacted on July 7, 2022) and within 730 days after the completion of the installation/construction (as proven by the date on the Certificate of Occupancy or other acceptable construction completion documentation). Retroactive financing requirements are detailed in Section 11.0 of the September 2022 Philadelphia C-PACE Program Guidelines.” (Addendum Page 3, page 72 of the PDF).  

The Philadelphia C-PACE program will be modifying its Program Guidelines to remove this timing requirement. Instead, all C-PACE eligible projects will be able to use retroactive financing within 730 days after the completion of the installation/construction (as proven by the date on the Certificate of Occupancy or other acceptable construction completion documentation). 

The revised Program Guidelines will most likely be issued in August 2023. At that time, PEA will accept C-PACE pre-applications and final applications for retroactive projects that were completed prior to September 6, 2022.

This change is for the Philadelphia program only.  If you have a project in another PA county, please contact the SEF team at regarding that county’s program guidelines. 

Contact for questions about the Philadelphia program.

PACE Equity closes first Philly deal with Bromley Loom House

PACE Equity, the Philadelphia Energy Authority and the owners of 2315-2325 N. Front Street closed the 14th C-PACE deal in Philadelphia with $997,706 to finance energy efficiency and water conservation measures for a newly constructed multifamily/mixed use property in East Kensington.  Fact sheets for this project and all PA C-PACE projects can be found here

The property is known as the Bromley Loom House. It is a 63-unit multifamily property with two commercial units. Greg Ambrosi, CFO of Ampere Capital Group, the developer/owner of the property stated, “while we used C-PACE funding as a stop gap for supply chain overages and a bridge loan our first time using the product, I definitely see the value of utilizing the product moving forward from the beginning of construction. It is priced better than almost all current construction lending, and can really shore up the capital stack; decreasing equity needs while lowering overall cost of capital, and also improving ratios that banks value. Add that to the fact that Lisa’s team from the city and Aysha’s team from PACE-Equity were very responsive, this was a very smooth process.”

“We applaud the team at Ampere Capital Group for choosing long-term, non-recourse PACE financing for the Bromley Loom House,” stated Stephen Arrivello, PACE Equity’s Philadelphia Managing Director. PACE Equity helps complete the capital stack with low-cost capital by funding improvements that contribute to lower energy costs and lower carbon.”

PEA is pleased to welcome PACE Equity to the growing group of C-PACE capital providers having closed projects in Philadelphia (Nuveen Green Capital, Counterpointe SRE, CCG PACE, Enhanced Capital, and Twain Financial Partners). 

$158 million of private capital utilizing the C-PACE program has been invested in energy efficiency, water conservation and solar energy during the first three years of the program’s inception in Philadelphia. C-PACE may also be used for resiliency and indoor air quality improvements.

This project is notable because of the speed it was approved and closed. It took just seven weeks from submission of the pre-application to recording the C-PACE assessment. 

Interested in learning more about C-PACE? Contact us at and/or attend our C-PACE Open Meetings which take place on the last Thursday of each month from 2:00-3:00PM. See all C-PACE Philadelphia events here.

2022 C-PACE Year in Review Released

Philadelphia C-PACE released its 3rd annual C-PACE Year in Review. 2022 marked the expansion of the C-PACE program to include eligibility for multifamily properties as well as measures to improve resiliency and indoor air quality. The program also hit $100MM in C-PACE investments in 2022. Check it out here.

Largest C-PACE and 2nd Multifamily Deal in PA Closes


Developer Southern Land Company secures $40MM in energy efficiency financing for 329 apartments and 15,000 SF of retail through C-PACE program expansion

The Philadelphia Energy Authority, Nuveen Green Capital and Southern Land Company announced today the closing of $40MM for a 329-unit multifamily property in the Callowhill neighborhood of Philadelphia at 5th and Spring Garden Streets. This is the largest C-PACE financing in Pennsylvania.

Commercial Property Assessed Clean Energy (C-PACE) financing allows for investments in energy efficiency, water conservation, renewable energy, and now IAQ and resiliency, that are paid back over time through special property assessments. This project is the second in Pennsylvania to take advantage of expanded eligibility for multifamily properties. 

“This project could not have been financed without C-PACE. We are grateful to be benefiting from the newly expanded C-PACE program,” said Tim Downey, Southern Land Company Founder and CEO. “Energy efficiency is central to the design and functionality of this project. It truly matters to us that C-PACE financing is available to support our objective of designing and building better for the long-term. Both the Philadelphia Energy Authority and Nuveen Green Capital have made this process easy to navigate and clearly beneficial.”

“We could not be more thrilled to have worked on this historic deal with Southern Land Company and the Philadelphia Energy Authority,” said Shelah Wallace, Director of Originations at Nuveen Green Capital. Not only is it the largest, and second-ever multifamily project to be funded through C-PACE, it is showing CRE developers and property owners the power of this financing mechanism.”  

Senate Bill 635 expanded eligibility for C-PACE financing to include multifamily commercial buildings, indoor air quality and building resiliency improvements. Act 43 of 2022 expands on Act 30 of 2018, which first enabled C-PACE financing in Pennsylvania for commercial buildings. Sponsored by Senator Yudichak, the Act extends eligibility to multifamily commercial buildings of 5 or more units, as well as indoor air quality and building resiliency improvements. Representative Heffley sponsored the House companion bill, HB 1760.

“We are grateful to Senator Yudichak and Representative Heffley for their sponsorship of expansion,” said Emily Schapira, President & CEO of the Philadelphia Energy Authority, Philadelphia’s C-PACE Administrator. “This project is evidence of the importance of the expansion.”

This and all other Philly C-PACE case studies and disclosures can be found here.