Power Generation, Transmission, and Use

Markets, Regulation, and Oversight

Impacts of Power Generation and Transmission

Looking Ahead


CEIR Report Map


Maryland Power Plants and the Environment (CEIR-18)

3.3.3 PJM Transmission Planning

PJM conducts annual transmission planning to forecast and address potential reliability issues. PJM’s Regional Transmission Expansion Planning (RTEP) process models future load and generation, and identifies and evaluates possible new transmission projects or upgrades. PJM has authority over the transmission system and an obligation to maintain reliability. However, PJM can only put forward transmission solutions in RTEP. PJM cannot impose generation or demand response solutions, and includes in the RTEP model only those generation projects that have requested interconnection to the PJM grid and are at a relatively late stage of development. Additionally, only demand response resources that have cleared in the RPM are recognized by PJM for purposes of reliability assessment.

PJM develops a 15-year Transmission Plan that includes upgrades to help alleviate constraints identified through the modeling exercise. Once a transmission constraint is identified, PJM authorizes construction and cost recovery of transmission upgrades to address the area of concern. PJM authorization does not supersede state regulation, so a CPCN may be required depending on state siting and permitting regulations. PJM also considers market efficiency upgrades designed to relieve economic congestion by reducing overall operating and supply costs for customers. Since the 2012 RTEP planning cycle, PJM has included public policy requirements (for example, state Renewable Energy Portfolio Standard policies) when considering transmission upgrades. (See Figure 3-6 for the RTEP planning criteria.)

Figure 3-6 PJM RTEP Transmission Planning Criteria

PJM RTEP Planning with hub and spokes, RTEP Development (Reliability Criteria) at hub, with spokes pointing inward

Source: PJM 2015 Regional Transmission Expansion Planning.

In February 2016, PJM released the 2015 RTEP report, which outlines planned system upgrades approved by the PJM Board through December 31, 2015. The PJM Board has approved $24 billion in transmission enhancements since 1999. The 2015 RTEP contained the following high-voltage backbone transmission projects:

Maryland RTEP Upgrades

The 2015 PJM RTEP lists three generation interconnection-related upgrades, and four supplemental upgrades submitted by DPL (shown in Table 3-4). The cost of these transmission upgrades is expected to total $59 million. PJM RTEP only lists transmission upgrades with cost estimates greater than $5 million that were approved by the PJM Board in 2015.

Table 3-4 Major Transmission Upgrades in Maryland Included in 2015 PJM RTEP

Transmission Upgrade Date Cost $M Zone
Attachment facilities (Switchyard) − to be built along Pepco right-of-way. Final location to be determined by the developer. 6/1/2016 20.3 PEPCO
Construct underground portion of the transmission line from tower number N1085NA to the Burches Hill Substation. 6/1/2016 16.2 PEPCO
Install OPGW on circuit 6,727 from the Church substation to the new Y3-033 substation constructed by the Interconnection Customer pursuant to Option to Build (a distance of 15 miles). 9/15/2015 5.6 DPL
Build a new 230/34 kV substation (Crest substation) and loop the Cecil-Colora 230 kV circuit into the new substation. 12/31/2018 17.33 DPL
Install four 230 kV breaker ring bus configuration at Crest substation. 12/31/2018 DPL
Install six 34 kV breaker-breaker and half configuration at Crest substation. 12/31/2018 DPL
Install two 230/34 kV transformers at Crest substation. 12/31/2018 DPL

Source: PJM 2015 Regional Transmission Expansion Planning.