Underconstruction#

Power generation projects under construction. Includes gas, solar, wind, and battery projects.

Endpoint#

GET

https://vulcan.api.synmax.com/v2/underconstruction

Request Examples#

curl -X GET "https://vulcan.api.synmax.com/v2/underconstruction" \
-H "Access-Key: $API_TOKEN"

Response#

Parameters

Type

Description

Example

balancing_authority

string

EIA balancing authority responisble for grid reliability in plant’s service area

SWPP

county

string

Plant county - Provided by EIA

Fayette

created_at

string

ISO date on which the record was created

2025-04-28T12:34:56Z

date_construction_50_percent_complete

string

Date where a plant has been deemed to appear 50% complete

2/7/2024

date_construction_completed

string

Date where plant has been deemed complete based on satellite observations

4/15/2025

date_construction_start

string

Start date of construction for a given plant

2025-03-09

date_first_structures

string

Date where the first permanent structures are identified for a given plant

2023-07-12

date_image

string

Date of the latest available satellite image

2025-04-14

date_image_reviewed

string

Date on which the latest satellite image was reviewed

2025-04-16

date_land_cleared

string

Date of first land cleared for a given plant

2022-05-07

date_operation

string

The actual date the plant became operational

2026-06-01

date_planned_operation

string

The EIA online month and year with each date assigned to the 15th of the given month to normalize data.

2026-05-15

date_vulcan_earliest_online

string

The earliest possible date a plant is projected to be operational

2024-02-07

date_vulcan_earliest_plus_7

string

The earliest possible date a plant could be operational if construction were to start 1 week after the last update.

1/27/2026

date_vulcan_latest_online

string

The latest possible date a plant is projected to be operational

2027-07-24

date_vulcan_median_online

string

The median projected date a plant is projected to be operational, between the earliest and latest online dates

2026-04-15

date_vulcan_status_change

string

Date of which a plants status was changed to under construction

2025-06-03

days_eia_minus_vulcan_earliest_online

object

The difference in days between the EIA online date and the Vulcan earliest date

108

days_eia_minus_vulcan_latest_online

object

The difference in days between the EIA online date and the Vulcan latest date

-1155

entity_name

string

EIA plant operating entity

1000 Mile Solar, LLC

generator_id

string

EIA ID given to each generator for a given plant

PV1

latitude

number

EIA plant latitude

33.0225

longitude

number

EIA plant longitude

-102.709

modified_at

string

ISO date on which the record was last modified

2025-04-28T12:34:56Z

nameplate_capacity

number

EIA plant generator capacity in megawatts (MW)

200.0

nameplate_capacity_unit

string

EIA plant generator capacity unit

MW

observation

string

Observations or relevant plant comments after reviewing satellite images

land cleared

permission

string

Permission required to access this record

vulcan_underconstruction

plant_id

string

EIA plant id

68847

plant_name

string

EIA plant name

1000 Mile Solar

plant_status

string

EIA plants operational status, or its stage of construction

  1. Regulatory approvals pending. Not under construction

project_rank

number

Indicates the likelihood of a plant’s construction. Values range from 0-7, a higher-ranking number indicates a higher likelihood of plant construction.

3.6482

source

string

The source of the plant data

EIA

state_code

string

2 letter plant state code - provided by EIA

TX

synmax_id

string

Unique key of plant id and generator id

68847-PV1

technology

string

EIA primary generation technology

Solar Photovoltaic

total_generators

integer

Count of generators for a given plant id

2

total_wpi

number

Cumulative Weekly Progress Indicator — running sum of the unit’s weekly_progress_indicator across all observed vintages up to and including this row. A construction-momentum measure; ~56 is the median total at completion. 0 when the unit has no WPI observations yet. Present on every vintage row (half-point increments occur because pre-first-structures weeks are half-weighted).

28.0

vulcan_status

string

Indicates if a plant has been observed to be under construction

Confirmed

vulcan_tech

string

The generalized technology assigned by Vulcan. Used to estimate construction times

Solar

weekly_progress_indicator

number

Indicator of weekly progress

1.0

Normal Output#

synmax_id

modified_at

created_at

plant_id

generator_id

plant_name

entity_name

source

technology

vulcan_tech

plant_status

total_generators

project_rank

state_code

county

balancing_authority

latitude

longitude

nameplate_capacity

nameplate_capacity_unit

vulcan_status

date_vulcan_status_change

date_image

date_image_reviewed

date_construction_start

date_land_cleared

date_first_structures

date_construction_completed

permission

observation

date_construction_50_percent_complete

date_vulcan_earliest_online

date_vulcan_latest_online

date_vulcan_median_online

date_vulcan_earliest_plus_7

date_planned_operation

days_eia_minus_vulcan_earliest_online

days_eia_minus_vulcan_latest_online

date_operation

weekly_progress_indicator

total_wpi

67823-RRBES

2026-07-24

2026-07-24

67823

RRBES

Roadrunner Solar and BESS RRBES

Clenera LLC

EIA

Batteries

Solar Battery

(OP) Operating

2

4.125475068

AZ

Cochise

WALC

32.0861

-109.9353

235.0

mw

Operational

2026-04-02

2025-04-28

2026-07-11

2025-04-09

2024-12-08

2025-04-09

1

battery visible

TBD

2025-10-21

2027-02-08

2026-02-25

2025-10-21

2026-01-01

0

62295-67

2026-08-21

2026-07-24

62295

67

Rollins Solar

Rollins Solar

EIA

Solar Photovoltaic

Solar

  1. Regulatory approvals received. Not under construction

1

2.4827524

SC

Darlington

CPLE

34.3536

-80.0162

74.9

mw

Identified

2026-07-24

2026-07-17

2026-08-18

2026-07-17

2026-07-17

1

land cleared

TBD

2027-01-13

2028-10-09

2027-06-11

2027-01-13

2027-11-15

306.0

-329.0

0.5

2.0

62299-66

2026-09-25

2026-07-24

62299

66

Quest Solar

Quest Solar

EIA

Solar Photovoltaic

Solar Battery

  1. Regulatory approvals received. Not under construction

2

2.4825625

SC

Allendale

SCEG

32.9765

-81.2268

50.0

mw

none

2026-09-21

1

TBD

2027-02-27

2028-11-15

0.0

0.0

65344-66149

2026-09-11

2026-07-24

65344

66149

Noria Hondo Solar (Hybrid) 66149

Nexus Renewable Power, LLC

EIA

Batteries

Solar Battery

  1. Regulatory approvals pending. Not under construction

2

2.6828074

TX

Kleberg

ERCO

27.5534

-97.6753

75.0

mw

none

2025-05-14

2026-09-08

1

TBD

2027-03-18

2027-12-15

0.0

0.0

68028-DSP

2026-09-25

2026-07-24

68028

DSP

Delta Solar Plant

Entergy Mississippi LLC

EIA

Solar Photovoltaic

Solar

  1. Planned for installation, but regulatory approvals not initiated

1

4.4117484

LA

Bolivar

MISO

33.794

-90.7139

80.0

mw

Confirmed

2026-06-26

2026-06-03

2026-09-22

2026-04-19

2026-04-19

1

land cleared

TBD

2026-10-23

2028-08-12

2027-03-25

2026-10-23

2027-11-15

388.0

-271.0

0.5

5.0

66238-1SPS

2026-09-25

2026-07-24

66238

1SPS

Sculpin Solar

RWE Clean Energy

EIA

Solar Photovoltaic

Solar

  1. Planned for installation, but regulatory approvals not initiated

1

2.1660287

IN

DeKalb

PJM

41.3646

-84.8438

180.0

mw

none

2025-05-10

2026-09-14

1

TBD

2027-05-20

2028-12-15

0.0

65887-1

2026-09-25

2026-07-24

65887

1

Price Creek

Florida Power & Light Co

EIA

Solar Photovoltaic

Solar

(OP) Operating

1

FL

Columbia

FPL

30.1607

-82.5584

74.5

mw

Operational

2026-04-02

2026-01-01

2026-07-11

2025-09-03

2025-04-13

2025-09-03

1

panels visible

TBD

2025-12-12

2026-11-28

2026-02-24

2025-12-12

2026-01-01

0

3399-CTG2

2026-09-25

2026-07-24

3399

CTG2

Cumberland (TN) CTG2

Tennessee Valley Authority

EIA

Natural Gas Fired Combined Cycle

Gas Brownfield

  1. Planned for installation, but regulatory approvals not initiated

6

4.1792006

TN

Stewart

TVA

36.3903

-87.6539

454.8

mw

Identified

2025-06-24

2026-08-29

2026-09-19

2025-03-27

2025-03-27

1

land cleared

TBD

2027-08-22

2029-01-28

2028-05-10

2027-08-22

2029-01-15

512.0

-13.0

0.5

5.0

65850-ELIBS

2026-08-28

2026-07-24

65850

ELIBS

Elio Energy LLC

Elio Energy LLC

EIA

Batteries

Battery

  1. Planned for installation, but regulatory approvals not initiated

2

4.3441148

TX

Brazoria

ERCO

29.2477

-95.6855

300.0

mw

Confirmed

2025-01-29

2025-04-12

2026-08-23

2025-04-12

2024-12-31

2025-04-12

1

battery visible

TBD

2025-11-08

2028-10-18

2027-04-30

2025-11-08

2027-12-15

767.0

-308.0

0.0

3.0

68009-SB12

2026-08-21

2026-07-24

68009

SB12

Saltbranch 2

Leeward Asset Management, LLC

EIA

Solar Photovoltaic

Solar

  1. Under construction, more than 50 percent complete

1

3.3659663

OK

Mayes

SWPP

36.3316

-95.2293

73.0

mw

Confirmed

2026-06-26

2026-06-01

2026-08-19

2026-05-02

2025-08-22

2026-05-02

1

structures visible

TBD

2026-08-08

2027-07-18

2026-10-19

2026-08-08

2026-07-15

-24.0

-368.0

0.0

3.0