BLACK HILLS POWER INC

Q: Sep 30 2020

Q: Jun 30 2020

Q: Mar 31 2020

FY: Dec 31 2019

Q: Sep 30 2019

Q: Jun 30 2019

Q: Mar 31 2019

FY: Dec 31 2018

Q: Sep 30 2018

Q: Jun 30 2018

Q: Mar 31 2018

FY: Dec 31 2017

Q: Sep 30 2017

Q: Jun 30 2017

Q: Mar 31 2017

FY: Dec 31 2016

Q: Sep 30 2016

Q: Jun 30 2016

Q: Mar 31 2016

FY: Dec 31 2015

5.03,9.01

1.01,2.03,9.01

1.01,9.01

1.01,8.01,9.01

8.01,9.01

8.01,9.01

2,7

4

5,7

5,7

5

5

5

5

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

No description available

No description available

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Post-effective amendment to a registration statement

Prospectus Supplement with Pricing Information

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

No description available

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Post-effective amendment to a registration statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

none

BlackRock Inc.

BlackRock Inc.

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS GLOBAL INVESTORS NA /CA/

BARCLAYS PLC

BARCLAYS GLOBAL INVESTORS NA /CA/

FMR CORP

FMR CORP

FORSYTHE GERALD R

BLACK HILLS CORP

BLACK HILLS CORP

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Post-effective amendment to an automatic shelf registration statement

Post-effective amendment to an automatic shelf registration statement

Letter from the SEC

Letter from the SEC

Letter from the SEC

Letter from the SEC

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)